Layer 3: Add initial section for ISIS

Add chapter PiHole: whitelist example, Update Linux: code

See merge request netravnen/NetworkLabNotes!33

.gitignore

@@ -0,0 +1,15 @@
+*.gz
+*.aux
+*.ist
+*.acn
+*.bbl
+*.blg
+*.lof
+*.synctex(busy)
+*.toc
+*.out
+latexmkrc
+/main.*
+/*.log
+.vscode
+.venv

.mailmap

@@ -1,4 +1,5 @@
-Christoffer <netravnen@gmail.com> <anonymous@overleaf.com>
-Christoffer <netravnen@gmail.com> <unknown@example.com>
-Christoffer <netravnen@gmail.com> <netravnen@users.noreply.github.com>
-Christoffer <netravnen@gmail.com> <zbcchhan11@zbc.dk> 
+Chriztoffer <chriztoffer@netravnen.de> <anonymous@overleaf.com>
+Chriztoffer <chriztoffer@netravnen.de> <unknown@example.com>
+Chriztoffer <chriztoffer@netravnen.de> <netravnen@users.noreply.github.com>
+Chriztoffer <chriztoffer@netravnen.de> <zbcchhan11@zbc.dk>
+Chriztoffer <chriztoffer@netravnen.de> <netravnen@gmail.com>

.pre-commit-config.yaml

@@ -0,0 +1,13 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+#
+# To skip hooks on single commit, use --no-verify
+#
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.2.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: check-added-large-files

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## [Unreleased]
 - See commit changelog
 
+## [0.4.0] - 2018-02-18
+### Added
+- EIGRP chapter
+
+## [0.3.4] - 2017-09-17
+### Fix
+- Cannot remember what was fixed
+
 ## [0.3.3] - 2017-09-15
 ### Fix
 - Table 2: Spanning Tree standards
@@ -55,7 +63,26 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Initial version
 - Section: Spanning Tree
 
-[Unreleased]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.3.3...HEAD
+[1.0.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.19.0...v1.0.0
+[0.19.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.18.0...v0.19.0
+[0.18.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.17.0...v0.18.0
+[0.17.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.16.0...v0.17.0
+[0.16.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.15.0...v0.16.0
+[0.15.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.14.0...v0.15.0
+[0.14.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.13.0...v0.14.0
+[0.13.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.12.0...v0.13.0
+[0.12.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.11.0...v0.12.0
+[0.11.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.10.0...v0.11.0
+[0.10.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.9.0...v0.10.0
+[0.9.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.8.0...v0.9.0
+[0.8.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.7.0...v0.8.0
+[0.7.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.6.0...v0.7.0
+[0.6.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.5.0...v0.6.0
+[0.5.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.4.0...v0.5.0
+
+[Unreleased]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.4.0...HEAD
+[0.4.0]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.3.4...v0.4.0
+[0.3.4]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.3.3...v0.3.4
 [0.3.3]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.3.2...v0.3.3
 [0.3.2]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.3.1...v0.3.2
 [0.3.1]: https://gitlab.com/netravnen/CiscoLabNotes/compare/v0.3.0...v0.3.1

LICENSE.md

@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-Copyright (c) 2017, Netravnen
+Copyright (c) 2017-2018, Netravnen
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,8 @@
+# Merge request
+
+Describe in sub-points to the listed main points:
+- New ?
+- Changed ?
+- Removed ?
+
+Make sure to have read the [contribution guide](CONTRIBUTING.md) in advance

README.md

@@ -1,7 +1,9 @@
+URLs: [Development repository][gitlab], [mirror][github], [mirror][git.data.coop]
+
 # Subjects tryied covered
 
 ## Switching
-- [X] Spanning Tree
+- [x] Spanning Tree
 - [ ] SDM Templates
 - [ ] PoE
 - [ ] LACP
@@ -10,9 +12,9 @@
 - [ ] vPC (cisco proprietary)
 
 ## Routing
-- [X] BGP
+- [x] BGP
 - [ ] ISIS
-- [ ] EIGRP (cisco proprietary)
+- [x] EIGRP (cisco proprietary)
 - [ ] OSPF
 - [ ] RIP
 - [ ] InterVLAN Routing
@@ -59,19 +61,20 @@
 - [ ] StackWise
 
 ## AAA
-- [X] TACACS+ (cisco proprietary)
-- [X] RADIUS
+- [x] TACACS+ (cisco proprietary)
+- [x] RADIUS
 
 ## Example configuration snippets
 - [ ] SSH
-- [X] CDP (cisco proprietary)
-- [X] DHCP
-- [X] HSRP (cisco proprietary)
-- [X] Hardware clock
-- [X] LLDP
-- [X] NTP
-- [X] OSPFv2
-- [X] VTY
+- [x] CDP (cisco proprietary)
+- [x] DHCP
+- [x] HSRP (cisco proprietary)
+- [x] Hardware clock
+- [x] LLDP
+- [x] NTP
+- [x] OSPFv2
+- [x] VTY
 
-[repo-origin]: https://gitlab.com/netravnen/CiscoLabNotes
-[repo-mirror]: https://github.com/netravnen/CiscoLabNotes
+[gitlab]: https://gitlab.com/NETRAVNEN/NetworkLabNotes
+[github]: https://github.com/NETRAVNEN/NetworkLabNotes
+[git.data.coop]: https://git.data.coop/NETRAVNEN/NetworkLabNotes/settings

acronyms.tex

@@ -1,4 +1,10 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = main.tex
+
 \newacronym{adsl}{ADSL}{Asymmetric Digital Subscriber Line}
+\newacronym{aodv}{AODV}{Adhoc On-Demand Distance Vector Routing}
 \newacronym{ap}{AP}{Access Point}
 \newacronym{arin}{ARIN}{American Registry for Internet Numbers}
 \newacronym{arp}{ARP}{Address Resolution Protocol}
@@ -31,6 +37,8 @@
 \newacronym{dns}{DNS}{Domain Name System}
 \newacronym{dns6}{DNSv6}{Domain Name System version 6}
 \newacronym{dr}{DR}{Danmarks Radio}
+\newacronym{dual}{DUAL}{Diffusing Update Algorithm}
+\newacronym{dsdv}{DSDV}{Destination-Sequenced Distance Vector}
 \newacronym{dsl}{DSL}{Digital Subscriber Line}
 \newacronym{dst}{dst}{destination}
 \newacronym{dwdm}{DWDM}{}
@@ -46,6 +54,7 @@
 \newacronym{fhrp}{FHRP}{First Hop Redundancy Protocol}
 \newacronym{fib}{FIB}{Forward Information Base}
 \newacronym{fix}{FIX}{Federal Internet Exchange}
+\newacronym{frr}{FRR}{Free Range Routing daemon}
 \newacronym{fsm}{FSM}{Finite State Machine}
 \newacronym{ftp}{FTP}{File Transfer Protocol}
 \newacronym{ftps}{FTPS}{File Transfer Protocol Secure}
@@ -58,6 +67,8 @@
 \newacronym{gprs}{GPRS}{General Packet Radio Service}
 \newacronym{gsm}{GSM}{Global System for Mobile communications}
 \newacronym{ha}{HA}{High Availability}
+\newacronym{hsls}{HSLS}{Hazy-Sighted Link State Protocol}
+\newacronym{hmac}{HMAC}{Hashed Message Authentication Code}
 \newacronym{hsrp}{HSRP}{Hot-Standby Routing Protocol}
 \newacronym{http}{HTTP}{Hypertext Transfer Protocol}
 \newacronym{https}{HTTPS}{Hyper Text Transfer Protocol Secure}
@@ -78,6 +89,7 @@
 \newacronym{ip6}{IPv6}{Internet Protocol version 6}
 \newacronym{ipv4}{IPv4}{Internet Protocol version 4}
 \newacronym{ipv6}{IPv6}{Internet Protocol version 6}
+\newacronym{ipx}{IPX}{Internetwork Packet Exchange}
 \newacronym{irc}{IRC}{Internet Relay Chat}
 \newacronym{irtf}{IRTF}{Internet Research Task Force}
 \newacronym{isis}{IS-IS}{Intermediate System to Intermediate System}
@@ -93,6 +105,7 @@
 \newacronym{lan}{LAN}{Local Area Network}
 \newacronym{lldp}{LLDP}{Link Layer Discovery Protocol}
 \newacronym{mac}{MAC}{Media Access Control address}
+\newacronym{mbh}{MBH}{Mobile Backhaul}
 \newacronym{mec}{MEC}{Multichannel Ether-channel}
 \newacronym{med}{MED}{Multi-Exit Discriminator}
 \newacronym{metdst}{MET-DST}{Middle European Time Daylight Saving Time}
@@ -111,10 +124,13 @@
 \newacronym{nsf}{NSF}{Non-stop Forwarding}
 \newacronym{nss}{NSS}{National Security Strategy}
 \newacronym{ntp}{NTP}{Network Time Protocol}
+\newacronym{olsr}{OLSR}{Optimised Link State Routing}
 \newacronym{osi}{OSI}{Open Systems Interconnection}
 \newacronym{ospf}{OSPF}{Open Shortest Path First}
+\newacronym{ospf2}{OSPF}{Open Shortest Path First}
 \newacronym{ospf3}{OSPFv3}{Open Shortest Path First v3}
 \newacronym{ospfv3}{OSPFv3}{Open Shortest Path First v3}
+\newacronym{p2p}{P-2-P}{Point-to-Point}
 \newacronym{pagp}{PAgP}{Port Aggregation Protocol}
 \newacronym{poe}{PoE}{Power over Ethernet}
 \newacronym{poe+}{PoE+}{Power over Ethernet Plus}
@@ -140,9 +156,11 @@
 \newacronym{rpvst}{RPVST}{Per Vlan Rapid Spanning Tree}
 \newacronym{rpvst+}{RPVST+}{Per Vlan Rapid Spanning Tree Plus}
 \newacronym{rsvp}{RSVP}{Resource Reservation Protocol}
+\newacronym{rtp}{RTP}{Reliable Transport Protocol}
 \newacronym{sdm}{SDM}{Security Device Manager}
 \newacronym{sdsl}{SDSL}{Symmetric Digital Subscriber Line}
 \newacronym{sftp}{SFTP}{Secure Shell File Transfer Protocol}
+\newacronym{sia}{SIA}{Stuck in Active}
 \newacronym{sla}{SLA}{Service Level Agreement}
 \newacronym{slaac}{SLAAC}{Stateless Address Autoconfiguration}
 \newacronym{smtp}{SMTP}{Simpe Mail Transfer Protocol}
@@ -170,6 +188,7 @@
 \newacronym{ula}{ULA}{Unique Local Address}
 \newacronym{utc}{UTC}{Coordinated Universal Time}
 \newacronym{vlan}{VLAN}{Virtual Local Area Network}
+\newacronym{vlsm}{VLSM}{Variable-Length Subnet Masking}
 \newacronym{vpn}{VPN}{Virtual Private Network}
 \newacronym{vrf}{VRF}{Virtual Routing and Forwarding}
 \newacronym{vrrp}{VRRP}{Virtual Router Redundancy Protocol}

chapter/baseconf.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{Base Configuration}
 
 \section{Cisco Lab}

chapter/dhcp.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter[DHCP]{Dynamic Host Control Protocol}
 
 \section[DHCP Process]{Dynamic Host Control Protocol Process}

chapter/internet.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter[Internet]{The Internet {\footnotesize "Post cold-war modern times"}}
 
 The internet is a fundamental communication technology for today's modern society. The thing that started as the \Gls{arpanet}\cite{wiki:ARPANET} back in the late nineteen sixties has evolved to become the core of today's globalization on Earth.

chapter/ip.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter[IP]{Internet Protocol}
 
 \section[IPv6]{Internet Protocol v6}

chapter/l2tol3.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{L2 to L3}
 
 \section{Vlan-to-vlan routing}

chapter/layer2.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{Layer 2}
 
 \section{Switch Network}

chapter/layer3.tex

@@ -1,10 +1,231 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{Layer 3}
 
 \section{Routed Network}
 
+\subsection{Administrative Distance}
+
+\begin{table}[]
+    \centering
+    \resizebox{\columnwidth}{!}{%
+        \begin{tabular}{|l|l|}
+            \hline
+            \textbf{Routing Protocol} & \textbf{Administrative distance} \\ \hline
+            Directly connected interface & 0 \\ \hline
+            Static route out an interface & 1 \\ \hline
+            Static route to next-hop address & 1 \\ \hline
+            DMNR - Dynamic Mobile Network Routing & 3 \\ \hline
+            EIGRP summary route & 5 \\ \hline
+            External BGP & 20 \\ \hline
+            Internal EIGRP & 90 \\ \hline
+            IGRP & 100 \\ \hline
+            OSPF & 110 \\ \hline
+            IS-IS & 115 \\ \hline
+            Routing Information Protocol (RIP) & 120 \\ \hline
+            Exterior Gateway Protocol (EGP) & 140 \\ \hline
+            On Demand Routing (ODR) & 160 \\ \hline
+            External EIGRP & 170 \\ \hline
+            Internal BGP & 200 \\ \hline
+            Next Hop Resolution Protocol (NHRP) & 250 \\ \hline
+            Floating Static Route (ex. DHCP-learned) & 254 \\ \hline
+            Unknown (Others) & 255 \\ \hline
+        \end{tabular}%
+    }
+    \caption{Cisco default administrative distances}
+    \label{cisco-default-administrative-distances}
+\end{table}
+
+Always remember the following points for Cisco devices:\cite{wiki:Administrative_distance}
+\begin{itemize}
+    \item An administrative distance of 255 will cause the router to remove the route from the routing table and not use it.
+    \item Since IOS 12.2, the administrative distance of a static route with an exit interface is 1. Prior to the release of 12.2 it was in fact 0.
+    \item Only the interface itself has an administrative distance of 0, since a route cannot have a distance of less than 1.
+    \item Directly connected routes have an administrative distance of 0.
+\end{itemize}
+
+\newpage
+
 \section{OSPF}
+
+\newpage
+
 \section{IS-IS}
+
+\gls{isis} is the ISO standardized routing protocol. Designed for use by intermediate systems.
+
+\gls{isis} compared to other routing protocols standardized in the \gls{ietf}.
+\begin{itemize}
+    \item Everything is \gls{tlv} based. Making the protocol very extensible by standardizing new \gls{tlv} values.
+    \item The participating nodes communicates with its neighbors on \gls{l2}. Thereby not \textit{requiring} \gls{l3} addresses on the link. And instead uses the \gls{mac} to target the neighbor node.
+    \item The connection is done on per-interface. Similar to \gls{ospf3}. Instead of the global approach in \gls{ospf2}.
+    \begin{itemize}
+        \item The per-interface is the result of deciding the area is handled per-interface. Instead of at the per-node level.
+        \item The border between areas is at the node level. Instead of the interface level in \gls{ospf2}.
+    \end{itemize}
+    \item Uses its own ethertype of 0x22F4\cite{IEEE802N51:online}.
+    \begin{itemize}
+        \item \rfc{6325}.
+    \end{itemize}
+    \item Commun
+\end{itemize}
+
+\newpage
+
 \section{EIGRP}
+
+\gls{eigrp} is Cisco's enhanced edition if \gls{igrp}. Dating back to 1993 and a
+leg for Cisco over other vendors back in the early days of the Internet. (..
+hmm. And remember Cisco's implementation of \gls{ospf} was known to be unstable
+until the early 2000's.)
+
+The change to \gls{eigrp} from \gls{igrp} was due to the support of classless
+routing. (\gls{igrp} only supported classful routing of class A (/8), B (/16),
+and C (/24) networks.)
+
+Cisco converted \gls{eigrp} to an open standard back in 2013 with
+\rfc{7868}.\cite{wiki:Enhanced_Interior_Gateway_Routing_Protocol}
+
+\gls{eigrp} adds support for \gls{vlsm} and the \gls{dual} with improved routing
+capabilities in comparison to \gls{igrp}. Overall \gls{eigrp} provides better
+capabilities compared to it's predecessor.
+
+\subsection[Math]{The Math behind}
+
+\fig{math/eigrp-dual-long}{eigrp-dual-long}{\glspl{eigrp} \gls{dual} full
+    formula}
+
+By default $K_2$, and $K_4$ is set to zero. (The are user customizable!) And
+$K_5$ is set to 0.
+
+In effect the resulting shorter formula is this:
+
+\fig{math/eigrp-dual-short}{eigrp-dual-short}{\glspl{eigrp} \gls{dual} short
+    formula}
+
+\subsection{How it actually works}
+
+\gls{eigrp} does it routing on a \texttt{next-hop} basis. Meaning it only stores
+information about a given routes next turn. And \textbf{not} about the
+destination itself. (Like \gls{ospf} does)
+
+\subsubsection{Defaults}
+
+\gls{eigrp} runs on Cisco equipment with values of:
+\begin{itemize}
+    \item \itemhead[]{Administrative Distance (Defaults)}
+    \begin{itemize}
+        \item Internal: 90
+        \item External: 180
+        \item Summary: 5
+    \end{itemize}
+    \item \itemhead[]{Timers}
+    \begin{itemize}
+        \item Hello: 5s / 60s \footnote{The larger timer value applies at speeds <= T1 circuit bandwidth (a.k.a. lower-than-equal-to 1.544 Mbps)}
+        \item Hold: 15s / 180s
+    \end{itemize}
+    \item \itemhead[]{Supported Protocols}
+    \begin{itemize}
+        \item \gls{ip}
+        \item \gls{ipx}
+        \item AppleTalk
+    \end{itemize}
+    \item \itemhead[]{Other}
+    \begin{itemize}
+        \item Type: Distance Vector
+        \item Algorithm: \gls{dual}
+        \item Transport: \gls{ip}/88
+        \item Authentication: MD5
+        \item Multicast \gls{ipv4}: 224.0.0.10
+        \item Multicast \gls{ipv6}: <!-- some number -->
+    \end{itemize}
+\end{itemize}
+
+\subsubsection{Tables}
+
+\gls{eigrp} contains three tables for storing route information.
+
+\begin{enumerate}
+    \item \itemhead[]{Neighbor Table}
+    \begin{itemize}
+        \item \textit{Lists \textbf{all} directly connected neighbors}
+        \item Next-Hop Router(s)
+        \item Interface(s)
+    \end{itemize}
+    \item \itemhead[]{Topology Table}
+    \begin{itemize}
+        \item \textit{Lists \textbf{all} learned from \textbf{all} \gls{eigrp} neighbors}
+        \item Destination
+        \item Metric
+    \end{itemize}
+    \item \itemhead[]{Global Routing Table}
+    \begin{itemize}
+        \item \textit{Best routes from \gls{eigrp} topology tabel will be copied to the routing table}
+    \end{itemize}
+\end{enumerate}
+
+\subsection{Stub Routing}
+
+\gls{eigrp} features some different ways to configure routers for specific routing scenarios. \texttt{Stub} routing is one of them.
+
+Stub routing effectively prevents the given stub site/router to be used for transit traffic.
+
+If a router is configured as a \texttt{Stud Router}. It only carries information about \tsq{it}s locally connected routes and a default route back to the transit routers. \tsq{It}s also omitted from being queried about networks is does not advertise. {\small (I.e. The Routes Query Process)}s
+
+\subsection{Updates Exchange}
+
+\begin{enumerate}
+    \item Routers always exchange full topology table information when neighbor-ship is established.
+    \item Now refresh of data will be done. Unless topology updates occur.
+    \item If the topology changes. A partial update about the specific prefix is sent to neighbors.\footnote{Changes includes metric components, link statuses, change in announced topology information.}
+    \item If a neighbor-ship fail. Then a new adjacency is formed with a full topology exchange is done.
+\end{enumerate}
+
+Always remember \gls{eigrp} does split-horizon by default on all active links when exchanging topology updates.
+
+Split-horizon is the \textit{famous} rule about not sending topology updates back to the router who sent the topology update in the first place.
+
+\gls{eigrp} uses \gls{rtp} to send topology updates and confirmation receipts.
+
+On \gls{p2p} interfaces. \gls{eigrp} simply send and ACK back to the sender.
+On multi-access interface/segments. \gls{eigrp} sends updates to 224.0.0.10 and receivers reply with a unicast ACK message to the sender.
+
+\subsection[SIA]{Stuck-in-Active}
+\gls{eigrp} is known and feared for it being \texttt{Stuck-in-Active} mode when exchanging route updates between routers. The Stuck-in-Active state could cause problems on low end network gear with a low amount of resources available for the routing process. Which in cases could cause the network device to use all available resources when querying neighbor devices for updates.
+
+\fig{eigrp/stuck-in-active}{stuck-in-active}{EIGRP Stuck in Active}
+
+End result is neighbor ships between \gls{eigrp} routers is terminated and re-established again with a fresh set of route updates going out.
+
+Imagine a large \gls{eigrp} topology (3-digit number of routers) in a single domain and beginning with 1 neighbor-ship gets re-established. And then again and again and again. Can result in quickly several routers going Stuck-in-Active because \gls{eigrp} queries are not getting answered within a short time-frame when all routers needs to query \tsq{it}s own neighbors and their neighbors and their neighbors and so forth. Until their are no more neighbors to be queried up and down the hierarchical network topology.
+
+\fig{network/routing}{network-topology}{Medium sized network topology}
+
+\subsection{Non-Cisco Implementations}
+
+This is always a particular point of discussion around \gls{eigrp}. Cisco has released \textit{some} information on how \gls{eigrp} works.
+Not \textit{all} information.
+And only as \textit{informational} RFCs.
+This ensures Cisco \textit{still} has control of the development of the protocol.
+Because they have retained ownership by only publishing informational RFCs.
+
+This has been a hindrance for the adoption of \gls{eigrp} in other vendors than Cisco them-self.
+
+Known adoptions of EIGRP includes:
+\begin{itemize}
+    \item \gls{frr} targeted release 4\cite{Frr30-4047:online}
+    \item Quagga has known works for trying to implement \gls{eigrp}. Still not officially implemented, thou.
+\end{itemize}
+
+\subsection{Filtering}
+
+\gls{eigrp} routing updates can of course be filtered in- and outgoing direction on Cisco boxes by using prefix-lists and applying the prefix lists under the \texttt{router eigrp x} process.
+
+\newpage
+
 \section{RIP}
 
 rip is the old routing protocol still existing using nukber-of-hops as the metric to calculate which route to take to the intended destination. This approach can work fine but has a nukber of weaknesses.
@@ -13,10 +234,58 @@ rip is the old routing protocol still existing using nukber-of-hops as the metri
 3. Has no concept of load sharing traffic between links if the same amount of hops is present amongst the best paths available.
 4. Limited to a miximum of 16 hops between source and destination.
 
+\newpage
+
 \subsection{RIPng}
 
 The version of rip supporting ipv6. different to the standard rip in the ng version is using different multicast addresses to communicate on.
 
+\newpage
+
+\section{Babel}
+
+Babel is built on the principles of 1) \gls{dsdv}, 2) \gls{aodv}, and 3)
+\gls{eigrp} protocols.
+Made for hybrid networks\footnote{network contains wired and wireless links}
+and can account for a high level of instability on wireless links.
+
+Babel has been reported to be running stable in unstable wireless networks with
+a level of reliability and fast convergence.
+
+\begin{itemize}
+    \item Loop-avoidance protocol,
+    \item Uses distributed Bellman-Ford algorithm,
+    \item \rfc{6126} in 45 pages, \textit{(28 are normative)}
+    \begin{enumerate}
+        \item Updates by \rfc{7298} {\scriptsize (The Babel extension
+        mechanism)}, and
+        \item \rfc{7557} {\scriptsize (Babel \gls{hmac} Cryptographic
+        Authentication)}.
+    \end{enumerate}
+    \item Highly extensible protocol,\cite{BabelDoe86:online}
+    \item Supports \gls{ip4} and \gls{ip6}.
+\end{itemize}
+
+Babel on \underline{wired} networks uses by default hop-count. Can be
+configured to include several values when computing the metrics.
+On \underline{wireless} networks Babel should be configured to take into
+account factors such as link latency, packet loss, hop-count, and radio
+diversity.
+
+\subsection{Protocol support}
+
+Currently the following projects include support for Babel:
+\cite{Babel-al30:online}
+
+\begin{itemize}
+    \item Bird {\footnotesize \url{http://bird.network.cz/}}
+    \item FRR {\footnotesize \url{https://frrouting.org/}}
+    \item Pybabel {\footnotesize \url{https://github.com/fingon/pybabel/}}
+    \item Sbabeld {\footnotesize \url{http://github.com/jech/sbabeld/}}
+\end{itemize}
+
+\newpage
+
 \section{Static}
 
 \newpage
@@ -61,26 +330,26 @@ Route-maps is used to target a select set of routes and either modify/add/remove
     \begin{enumerate}[label={\alph*)}]
         \item \Gls{bgp} communities,
         \item \Gls{ip} prefix,
-        \item \Gls{bgp} as-path, 
+        \item \Gls{bgp} as-path,
     \end{enumerate}
 \end{itemize}
 
 An simple example of using route-maps is
 
 \begin{cisco}
-ip prefix-list 1 permit 172.16.0.0/16 
-ip prefix-list 2 permit 192.168.1.0/24 
+ip prefix-list 1 permit 172.16.0.0/16
+ip prefix-list 2 permit 192.168.1.0/24
 !
-route-map RED permit 10 
- match ip address prefix-list 1 
+route-map RED permit 10
+ match ip address prefix-list 1
  set ip next hop 10.1.1.1
  continue 20              ! Continues to apply rules normally only
                           ! applied to prefix-list 2. To apply to
                           ! prefix-list 1, too.
                           ! Any attributes set in '20' will
                           ! override any set during '10'.
-route-map RED permit 20 
- match ip address prefix-list 2 
+route-map RED permit 20
+ match ip address prefix-list 2
  set ip next hop 10.2.2.2 ! Last rule overrides previous rules from
                           ! previous '10' rule-set.
 \end{cisco}

chapter/linux.tex

@@ -1,34 +1,75 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{Linux}
 
 \section{Kernel Upgrades}
 
+LIST KERNELS ON /boot PARTITION
+
 \begin{txt}
-    # LIST KERNELS ON /boot PARTITION
-    
-    dpkg --list | grep linux-image
-    dpkg --list | grep linux-headers
+dpkg --list | grep linux-image
+dpkg --list | grep linux-headers
 \end{txt}
 
-\begin{txt}    
-    # REMOVE SELECTED KERNEL VERSIONS FROM BOOT PARTITION
-    
-    sudo apt-get purge linux-image-4.4.0-{75,78,79}
-    sudo apt-get purge linux-image-extra-4.4.0-{75,78,79}
-    sudo apt-get purge linux-headers-4.4.0-{75,78,79}
-    
-    or
-    
-    sudo apt autoremove [-f]
-\end{txt}
-    
+REMOVE SELECTED KERNEL VERSIONS FROM BOOT PARTITION
+
 \begin{txt}
-    # My one-liner to remove old kernels (this also frees up disk space)
-    # https://askubuntu.com/a/254585
-    
-    dpkg --list | grep linux-image | awk '{ print \$2 }' | sort -V | sed -n '/'`uname -r`'/q;p' | xargs sudo apt-get -y purge
+sudo apt-get purge linux-image-4.4.0-{75,78,79}
+sudo apt-get purge linux-image-extra-4.4.0-{75,78,79}
+sudo apt-get purge linux-headers-4.4.0-{75,78,79}
 \end{txt}
-    
-\begin{txt}    
-    # Remember to update grub2 configuration
-    sudo update-grub2
-\end{txt}
+
+or alternatively
+
+\begin{txt}
+sudo apt autoremove [-f]
+\end{txt}
+
+My one-liner to remove old kernels (this also frees up disk space). https://askubuntu.com/a/254585
+
+\begin{txt}
+dpkg --list | grep linux-image | awk '{ print \$2 }' | sort -V | sed -n '/'`uname -r`'/q;p' | xargs sudo apt-get -y purge
+\end{txt}
+
+Remember to update grub2 configuration
+
+\begin{txt}
+sudo update-grub2
+\end{txt}
+
+\newpage
+
+\subsection{Proxmox}
+
+\subsubsection{Proxmox Migrations}
+
+Move a LXC containers storage volumes to a different storage backend, both the boot disk, and additional disks. 1400 is here the example Container ID. And ''tank'' the target storage backend. We need to stop the container before we are allowed to migrate the storage volumes of the container. We start the container back up after finishing migrating the storage volumes.
+
+\begin{txt}
+sudo pct stop 1400 && \
+sudo pct move-volume 1400 rootfs tank --delete && \
+sudo pct move-volume 1400 mp0    tank --delete && \
+sudo pct start 1400
+\end{txt}
+
+Using Remote Migrate to migrate an LXC container to a different Proxmox Node in another Proxmox Cluster. This is an offline migration, where we turn off the Container when migration. And restarting it with the new bridge setting afterwards. If the IPs have changed. This needs to be updated manually.
+
+\begin{txt}
+sudo pct remote-migrate \
+  $(
+    sudo pct list |
+    grep <LOOK FOR A SPECIFIC HOSTNAME> |
+    grep --perl-regex --only-matching '^\d+'
+  ) \
+  <TARGET CONTAINER/VM ID> \
+  'apitoken=PVEAPIToken=<USER>@<METHOD>!<TOKEN NAME>=<TOKEN KEY>,host=<TARGET HOSTNAME OR IP>' \
+  --delete 1 \
+  --online 0 \
+  --restart 1 \
+  --target-bridge <TARGET BRIDGE NAME> \
+  --target-storage <TARGET STORAGE NAME>
+\end{txt}
+

chapter/mgmt.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{Campus Network}
 
 \section{Discover Nodes}
@@ -254,9 +259,9 @@ aaa authentication attempts login 1
 aaa authentication login default group TACACS local-case
 aaa authentication login console local-case
 aaa authentication enable default group TACACS enable
-aaa authorization exec default group TACACS local 
-aaa authorization commands 0 default group TACACS local 
-aaa authorization commands 15 default group TACACS local 
+aaa authorization exec default group TACACS local
+aaa authorization commands 0 default group TACACS local
+aaa authorization commands 15 default group TACACS local
 aaa accounting exec default
  action-type start-stop
  group tacacs+
@@ -303,7 +308,7 @@ Cisco switches allow by default only the following 3 protos until the client is
 	\item The \textbf{authentication server}
 \end{itemize}
 
-\fig{8021X/portauth}{portauth}{802.1X Port Auth}
+\fig{8021x/portauth}{portauth}{802.1X Port Auth}
 
 802.1X can be enabled on a Cisco switch globally by \cliline{dot1x system-auth-control} and \textit{then} enabled on the switch port{\footnotesize (s)} by \cliline{aaa authentication dot1x}.
 
@@ -492,10 +497,10 @@ Go all the way and do consider if Supervisor Redundancy is a necessary requireme
 
 \subsection[VSS]{Virtual Switch Stacking}
 
-Activating switch stacking means you get a single control plane for all 
-switches in a \gls{vss} stack. The stack master switch gets to have the active 
-control plane. With help of \gls{sso} \& \gls{nsf} data + switch fabric is kept 
-in sync between stack members. This way no communication is lost when failures 
+Activating switch stacking means you get a single control plane for all
+switches in a \gls{vss} stack. The stack master switch gets to have the active
+control plane. With help of \gls{sso} \& \gls{nsf} data + switch fabric is kept
+in sync between stack members. This way no communication is lost when failures
 \textbf{do} happen at some point.
 
 \fig{vss/vss2}{vss2}{How the access layer sees a \gls{vss}}
@@ -586,7 +591,7 @@ Remember use of \textbf{pre-emption} when configuring the \gls{hsrp} routers wit
 
 \subsubsection[Blncd]{Load Sharing}
 
-When configuring 
+When configuring
 
 \newpage
 

chapter/ntp.tex

@@ -1,3 +1,8 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter[NTP]{Network Time Protocol}
 
 \gls{ntp} is the source of all evil and \gls{sla}. A network wide source of time configuration for all network nodes, servers, clients etc. is necessary.

chapter/pihole.tex

@@ -0,0 +1,26 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
+\chapter{PiHole}
+
+\section{Whitelisting}
+
+\subsection{Zoom Video Conferencing}
+
+\begin{txt}
+  COMMENT='Zoom Video Conferencing';
+
+  pihole -w --comment "${COMMENT}" zoom.us --noreload && \
+  pihole -w --comment "${COMMENT}" app.zoom.us --noreload && \
+  pihole -w --comment "${COMMENT}" xmpp.zoom.us --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '^zoom([\d\w]+)\.(cloud|\w{3})\.zoom\.us$' --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '^\w{2}\d{1,4}\w{2}\d{1,4}\.zoom\.us$' --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '^us\d{1,4}web\.zoom\.us$' --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '^\w{1,4}\d{1,4}\.zoom\.us$' --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '^\w{2}\d{1,4}\w{1,4}static\.zoom\.us$' --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '\.cloud\.zoom\.us$' --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '^\w+(\d{1,2})?\.\w{2}\.zoom\.us$' --noreload && \
+  pihole --white-regex --comment "${COMMENT}" '^\w{2}\d{1,3}images\.zoom\.us$'
+\end{txt}

chapter/voip.tex

@@ -1 +1,6 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{VoIP}

chapter/wireless.tex

@@ -1 +1,6 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = ../main.tex
+
 \chapter{Wireless}

frontpage.tex

@@ -1,12 +1,10 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = main.tex
+
 \DTMsavenow{now}
 
-\title{Networking with switches and routers, automation and IPv4/6}
-\def\thesubject{My Notes going along with learning Cisco Networking}
-
-\author{"Netravnen (Gmail) (netravnen@gmail.com)" <netravnen@gmail.com>\\
-    Fingerprint: C8B3 82A8 A1CD CDB7 71FE  B24C C654 948F DA86 BECD}
-
-\def\theversion{v0.3.3}
 \date{{\footnotesize Last release \theversion\\%
     \texttt{\color{Gray}Generated \utccurrenttime}}}
 

main.tex

@@ -1,8 +1,25 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = main.tex
+
 % Declare Document Class
 \documentclass[a4paper,12pt,twoside,twocolumn,landscape]{book}
 \include{structure} % Load structure cfg for document
 \include{acronyms} % Load acronym list
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%                                                    %
+% Define constants to ensure attribution of work     %
+%                                                    %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\def\theversion{v0.4.0}
+\title{Networking with switches and routers, automation and IPv4/6}
+\def\thesubject{My Notes going along with learning Networking}
+\author{"Chriztoffer Hansen" <chriztoffer@netravnen.de>\\
+    GPG: 18DD 23C5 5029 3098 DE07  052A 9DCF 2CA0 08EB D2E8}
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %                                                    %
 % BEGIN DOCUMENT                                     %
@@ -35,6 +52,7 @@
 \include{chapter/voip}
 \include{chapter/baseconf}
 \include{chapter/linux}
+\include{chapter/pihole}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %                                                    %
@@ -69,7 +87,7 @@
 %                                                    %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-\bibliography{references-books,references-websites,references-wikipedia}
+\bibliography{references-books,references-websites,references-wikipedia,references-videos}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %                                                    %

references-videos.bib

@@ -0,0 +1,9 @@
+@misc{BabelDoe86:online,
+    author = {Juliusz Chroboczek},
+    title = {Babel Doesn't Care + Slides - BattleMeshV8 - YouTube},
+    howpublished = 
+    {\url{https://www.youtube.com/watch?v=1zMDLVln3XM&t=10s&ab_channel=AdjyLeak}},
+    month = {August},
+    year = {2015},
+    note = {(Accessed on 02/18/2018)}
+}

references-websites.bib

@@ -39,4 +39,31 @@
     month = "September",
     year = "2011",
     note = "[Online; accessed on 24-June-2017]"
-}
+}
+
+@misc{Frr30-4047:online,
+    author = {Donald Sharp},
+    title = {Frr 3.0 → 4.0 · FRRouting/frr Wiki},
+    howpublished = {\url{https://github.com/FRRouting/frr/wiki/Frr-3.0-%E2%86%92-4.0}},
+    month = {February},
+    year = {2018},
+    note = {(Accessed on 02/18/2018)}
+}
+
+@misc{Babel-al30:online,
+    author = {Juliusz Chroboczek},
+    title = {Babel — a loop-avoiding distance-vector routing protocol},
+    howpublished = {\url{https://www.irif.fr/~jch/software/babel/}},
+    month = {},
+    year = {},
+    note = {(Accessed on 02/18/2018)}
+}
+
+@misc{IEEE802N51:online,
+    author = {},
+    title = {IEEE 802 Numbers - https://www.iana.org/},
+    howpublished = {\url{https://www.iana.org/assignments/ieee-802-numbers/ieee-802-numbers.xhtml#ieee-802-numbers-1}},
+    month = {},
+    year = {},
+    note = {(Accessed on 10/01/2024)}
+}

references-wikipedia.bib

@@ -96,4 +96,20 @@
     year = "2017",
     howpublished = {\url{http://en.wikipedia.org/w/index.php?title=Solicited-node\%20multicast\%20address&oldid=787116453}},
     note = "[Online; accessed 19-July-2017]"
+}
+
+@misc{ wiki:Administrative_distance,
+    author = "Wikipedia",
+    title = "{Administrative distance} --- {W}ikipedia{,} The Free Encyclopedia",
+    year = "2017",
+    howpublished = {\url{http://en.wikipedia.org/w/index.php?title=Administrative\%20distance&oldid=799742717}},
+    note = "[Online; accessed 18-September-2017]"
+}
+
+@misc{ wiki:Enhanced_Interior_Gateway_Routing_Protocol,
+    author = "Wikipedia",
+    title = "{Enhanced Interior Gateway Routing Protocol} --- {W}ikipedia{,} The Free Encyclopedia",
+    year = "2017",
+    howpublished = {\url{http://en.wikipedia.org/w/index.php?title=Enhanced\%20Interior\%20Gateway\%20Routing\%20Protocol&oldid=800921738}},
+    note = "[Online; accessed 18-September-2017]"
 }

structure.tex

@@ -1,52 +1,51 @@
+% !TeX TS-program =
+% !TeX spellcheck = en_DK
+% !TeX encoding = UTF-8
+% !TeX root = main.tex
+
 % Latex Packages
-\usepackage[T1]{fontenc}
-\usepackage[utf8]{inputenc}
-\usepackage{lmodern}
-\usepackage{geometry}
-\usepackage{listings}
-\usepackage{color}
-\usepackage[usenames,dvipsnames,svgnames]{xcolor}
-\usepackage{graphicx}
-\usepackage[numbers,square,sectionbib,comma,nonamebreak,elide]{natbib}
-\usepackage{float}
+\usepackage{amsmath,amssymb} % math things.
+\usepackage{array}
 \usepackage[english]{babel}
-\usepackage{fancyhdr}
-\usepackage{wrapfig}
-\usepackage{array}
-\usepackage{lipsum}
-\usepackage{fancybox}
-\usepackage{varwidth}
-\usepackage{enumitem}
-\usepackage{titlepic}
-\usepackage[nottoc]{tocbibind}
-\usepackage{url}
-\usepackage[showisoZ]{datetime2}
-\usepackage{transparent}
-\usepackage{soul}
-\usepackage{caption}
-\usepackage{enumitem}
-\usepackage{amssymb}
-\usepackage{tikzsymbols} % http://ctan.math.utah.edu/ctan/tex-archive/graphics/pgf/contrib/tikzsymbols/tikzsymbols.pdf
-\usepackage{textcomp}
-\usepackage{parskip}
-\usepackage{fourier}
-\usepackage{array}
-\usepackage{makecell}
-\usepackage{inconsolata} 
 \usepackage{blindtext}
-\usepackage{expdlist} 
-\usepackage{epigraph} % used to style quotes
-\usepackage{titling} % makes available \thetitle \theauthor \thedate
-\usepackage[toc,acronym,footnote,nomain]{glossaries} % Load the package with the acronym option
+\usepackage{caption}
 \usepackage{chngcntr}
-\usepackage[toc]{multitoc}
+\usepackage{color} % makes custom color codes available.
+\usepackage[showisoZ]{datetime2} % more options for time formatting.
 \usepackage{dblfnote} % https://tex.stackexchange.com/a/8180
-\usepackage[unicode=false,
-    colorlinks=true,
-    linkcolor=darkgray,
-    citecolor=darkgray,
-    filecolor=darkgray,
-    urlcolor=darkgray]{hyperref} % https://en.wikibooks.org/wiki/LaTeX/Hyperlinks
+\usepackage{enumitem} % makes available changes to lists.
+\usepackage{epigraph} % used to style quotes
+\usepackage{expdlist}
+\usepackage{fancybox} % styling of boxes.
+\usepackage{fancyhdr}
+\usepackage{float}
+\usepackage[T1]{fontenc}
+\usepackage{fourier}
+\usepackage{geometry}
+\usepackage[toc,acronym,nomain]{glossaries} % Load the package with the acronym option
+\usepackage{glossaries-extra}
+\usepackage{graphicx}
+\usepackage[unicode=false,colorlinks=true,linkcolor=darkgray,citecolor=darkgray,filecolor=darkgray,urlcolor=darkgray]{hyperref} % https://en.wikibooks.org/wiki/LaTeX/Hyperlinks
+\usepackage{inconsolata}
+\usepackage[utf8]{inputenc}
+\usepackage{lipsum}
+\usepackage{listings}
+\usepackage{lmodern}
+\usepackage{makecell}
+\usepackage[toc]{multitoc}
+\usepackage[numbers,square,sectionbib,comma,nonamebreak,elide]{natbib} % used with layout for bibliography section.
+\usepackage{parskip}
+\usepackage{soul}
+\usepackage{textcomp}
+\usepackage[usenames,dvipsnames,svgnames]{xcolor} % makes custom color codes available. MUST for some reason be above tikzsymbols.
+\usepackage{tikzsymbols} % http://ctan.math.utah.edu/ctan/tex-archive/graphics/pgf/contrib/tikzsymbols/tikzsymbols.pdf
+\usepackage{titlepic}
+\usepackage{titling} % makes available \thetitle \theauthor \thedate
+\usepackage[nottoc]{tocbibind}
+\usepackage{transparent}
+\usepackage{url} % cmd \url.
+\usepackage{varwidth}
+\usepackage{wrapfig}
 
 
 \renewcommand*{\multicolumntoc}{3} % https://tex.stackexchange.com/a/6455
@@ -84,7 +83,7 @@
 	% You are not expected to understand this.
 	\renewcommand*{\sectionmark}[1]{ \markright{\thesection\ ##1} }%
 	\renewcommand*{\chaptermark}[1]{ \markboth{\chaptername\ \thechapter: ##1}{} }%
-	% Increase the length of the header such that the folios 
+	% Increase the length of the header such that the folios
 	% (typography jargon for page numbers) move into the margin
 	\fancyhfoffset[LE]{6mm}% slightly less than 0.25in
 	\fancyhfoffset[RO]{6mm}%
@@ -184,7 +183,7 @@
     captionpos=t,
     showstringspaces=false,
     breaklines=true,
-    breakatwhitespace=true,    
+    breakatwhitespace=true,
 }
 
 
@@ -271,10 +270,41 @@
 % https://tex.stackexchange.com/a/141975
 \let\origfootnote\footnote % font size of footnotes; changes \footnotesize command only inside footnotes!
 \renewcommand{\footnote}[1]{%
-    \renewcommand\footnotesize\scriptsize % here there is scriptsize in footnotes (example)       
+    \renewcommand\footnotesize\scriptsize % here there is scriptsize in footnotes (example)
     \origfootnote{#1}}
 
 
 % https://tex.stackexchange.com/a/146312
 \newlist{mylist}{enumerate*}{1}
 \setlist[mylist]{label={\alph*)},font={\color{red!25!black}\bfseries}}
+
+
+% https://cscrunch.com/blog/corey-pennycuff/scripting-latex-create-base-conversion-worksheet
+\def\colwidth{.42cm}
+\newcommand{\baseconvertpractice}[2]{% number, # to not censor (1-3, or 0 for none)
+  \renewcommand\arraystretch{2}
+  \FPeval{\num}{#1}%
+  \begin{tabular*}{\textwidth}{@{\extracolsep{\fill}}r|*{8}{>{\centering}p{\colwidth}|}|*{8}{>{\centering}p{\colwidth}|}@{}c@{}} \cline{2-17}%
+  Decimal & \multicolumn{16}{ r| }{\censorifnotequal{\num}{#2}{1}} &\\ \cline{2-17}%
+  Binary & \censorifnotequal{\getdigit{\num}{16}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{15}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{14}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{13}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{12}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{11}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{10}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{9}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{8}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{7}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{6}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{5}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{4}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{3}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{2}{2}}{#2}{2} &%
+  \censorifnotequal{\getdigit{\num}{1}{2}}{#2}{2} &\\ \cline{2-17}%
+  Hexadecimal & \multicolumn{4}{c|}{\censorifnotequal{\getdigit{\num}{4}{16}}{#2}{3}} &%
+    \multicolumn{4}{c||}{\censorifnotequal{\getdigit{\num}{3}{16}}{#2}{3}} &%
+    \multicolumn{4}{c|}{\censorifnotequal{\getdigit{\num}{2}{16}}{#2}{3}} &%
+    \multicolumn{4}{c|}{\censorifnotequal{\getdigit{\num}{1}{16}}{#2}{3}} &\\ \cline{2-17}%
+  \end{tabular*}%
+}