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update chapter ntp
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acronyms.tex
23
acronyms.tex
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@ -20,22 +20,25 @@
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\newacronym{dhcp}{DHCP}{Dynamic Host Control Protocol}
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\newacronym{dknog}{DKNOG}{Danish Network Operators' Group}
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\newacronym{dns}{DNS}{Domain Name System}
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\newacronym{dst}{DST}{Destination}
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\newacronym{dst}{dst}{destination}
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\newacronym{dwdm}{DWDM}{}
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\newacronym{eap}{EAP}{Extensible Authentication Protocol}
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\newacronym{eapol}{EAPOL}{Extensible Authentication Protocol over Local Area Network}
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\newacronym{eapol}{EAPoL}{Extensible Authentication Protocol over Local Area Network}
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\newacronym{eigrp}{EIGRP}{Enhanced Interior Gateway Routing Protocol}
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\newacronym{evpn}{EVPN}{Ethernet Virtual Private Network}
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\newacronym{ftp}{FTP}{File Transfer Protocol}
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\newacronym{ftps}{FTPS}{File Transfer Protocol Secure}
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\newacronym{gps}{GPS}{Global Positioning System}
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\newacronym{gprs}{GPRS}{General Packet Radio Service}
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\newacronym{gsm}{GSM}{Global System for Mobile communications}
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\newacronym{ieee}{IEEE}{Institute of Electrical and Electronics Engineers}
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\newacronym{igrp}{IGRP}{Interior Gateway Routing Protocol}
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\newacronym{imap}{IMAP}{Internet Message Access Protocol}
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\newacronym{ip}{IP}{Internet Protocol}
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\newacronym{ipv4}{IPV4}{Internet Protocol v4}
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\newacronym{ipv6}{IPV6}{Internet Protocol v6}
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\newacronym{ipv4}{IPv4}{Internet Protocol v4}
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\newacronym{ipv6}{IPv6}{Internet Protocol v6}
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\newacronym{irc}{IRC}{Internet Relay Chat}
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\newacronym{isis}{ISIS}{Intermediate System to Intermediate System}
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\newacronym{isis}{IS-IS}{Intermediate System to Intermediate System}
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\newacronym{isp}{ISP}{Internet Service Provider}
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\newacronym{l2}{L2}{Layer 2}
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\newacronym{l2vpn}{L2VPN}{Layer 2 Virtual Private Network}
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\newacronym{lacp}{LACP}{Link Aggregation Protocol}
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\newacronym{lan}{LAN}{Local Area Network}
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\newacronym{mac}{MAC}{Media Access Control address}
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\newacronym{metdst}{METDST}{Middle European Time Daylight Saving Time}
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\newacronym{metdst}{MET-DST}{Middle European Time Daylight Saving Time}
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\newacronym{mkc}{MKC}{Mikkel Krøll}
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\newacronym{mpls}{MPLS}{Multiprotocol Label Switching}
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\newacronym{mst}{MST}{Multiple Spanning Tree}
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\newacronym{ntp}{NTP}{Network Time Protocol}
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\newacronym{osi}{OSI}{Open Systems Interconnection}
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\newacronym{ospf}{OSPF}{Open Shortest Path First}
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\newacronym{ospfv3}{OSPFV3}{Open Shortest Path First v3}
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\newacronym{pagp}{PAGP}{Port Aggregation Protocol}
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\newacronym{ospfv3}{OSPFv3}{Open Shortest Path First v3}
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\newacronym{pagp}{PAgP}{Port Aggregation Protocol}
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\newacronym{pop3}{POP3}{Post Office Protocol}
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\newacronym{pvrst}{PVRST}{Per Vlan Rapid Spanning Tree}
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\newacronym{pvrst+}{PVRST+}{Per Vlan Rapid Spanning Tree Plus}
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@ -68,13 +71,13 @@
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\newacronym{snmp}{SNMP}{Simple Network Management Protocol}
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\newacronym{sntp}{SNTP}{Secure Network Time Protocol}
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\newacronym{sp}{SP}{Service Provider}
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\newacronym{src}{SRC}{Source}
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\newacronym{src}{src}{source}
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\newacronym{ssh}{SSH}{Secure Shell}
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\newacronym{stp}{STP}{Spanning Tree Protocol}
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\newacronym{tcn}{TCN}{Topology Change Notification}
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\newacronym{tcp}{TCP}{Transmission Control Protocol}
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\newacronym{tftp}{TFTP}{Trivial File Transfer Protocol}
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\newacronym{toc}{TOC}{Table Of Contents}
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\newacronym{toc}{ToC}{Table of Contents}
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\newacronym{udld}{UDLD}{Unidirectional Link Detection}
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\newacronym{udp}{UDP}{User Datagram Protocol}
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\newacronym{utc}{UTC}{Coordinated Universal Time}
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@ -16,7 +16,28 @@ service timestamps debug datetime msec localtime show-timezone
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service timestamps log datetime msec localtime show-timezone
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\end{txt}
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\fig{ntp/ntp}{ntp}{\gls{ntp}}
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\gls{ntp} servers are a hierarchical tree with stratum 0 servers as the authoritative in the tree. These servers get their time from either \gls{gprs} satellites or atomic clocks {\footnotesize (i.e. an authoritative time \gls{src})}.
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\subsection{Characteristics}
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\begin{itemize}
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\item Uses \gls{udp} port 123 on both \gls{src} and \gls{dst},
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\item polling interval ranging from 64-1024 sec. Length of interval is dependant upon network cond.,
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\item large differences between \gls{ntp} reference time and local client time will result in increased pooling interval.
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\end{itemize}
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\fig{ntp/ntpstratum}{ntpstratum}{Stratum levels}
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\section{The old NTP from \tsq{85}}
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\section{Secure NTP}
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\subsection{Characteristics}
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\begin{itemize}
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\item
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\end{itemize}
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img/ntp/ntp.png
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img/ntp/ntp.png
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img/ntp/ntpstratum.png
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img/ntp/ntpstratum.png
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