%% $XORP: xorp/docs/user_manual/diagnostics.tex,v 1.5 2006/03/09 06:40:43 pavlin Exp $%\chapter{Diagnostics and Debugging}\section{Debugging and Diagnostic Commands}XORP supports several operational commands in \xorpshthat can be used for debugging or diagnostics purpose.The {\stt ping <host>} command can be used to test if a network hostresponds to ICMP ECHO\_REQUEST packets:\vspace{0.1in}\noindent\framebox[\textwidth][l]{\scriptsize\begin{minipage}{6in}\begin{alltt}\begin{tabbing}xxxxxxxxxxxxxxxxxx\=\killuser@hostname> \textbf{ping 10.3.0.2}\\PING 10.3.0.2 (10.3.0.2): 56 data bytes\\64 bytes from 10.3.0.2: icmp\_seq=0 ttl=64 time=0.281 ms\\64 bytes from 10.3.0.2: icmp\_seq=1 ttl=64 time=0.244 ms\\64 bytes from 10.3.0.2: icmp\_seq=2 ttl=64 time=0.302 ms\\64 bytes from 10.3.0.2: icmp\_seq=3 ttl=64 time=0.275 ms\\user@hostname> ping 10.3.0.2\\Command interrupted!\end{tabbing}\end{alltt}\end{minipage}}\vspace{0.1in}The {\stt ping} command can be interrupted by the {\stt Ctrl-C} keycombination.The {\stt traceroute <host>} command can be used to print the route packetstake to a network host:\vspace{0.1in}\noindent\framebox[\textwidth][l]{\scriptsize\begin{minipage}{6in}\begin{alltt}\begin{tabbing}x\=xxx\=xxxxxxxxxxxxxxxxxxxxx\=xxxxxxxxxx\=xxxxxxxxxx\=\killuser@hostname> \textbf{traceroute 10.4.0.2}\\traceroute to 10.4.0.2 (10.4.0.2), 64 hops max, 44 byte packets\\ \>1  \>xorp3-t2 (10.3.0.2)  \>0.451 ms  \>0.366 ms  \>0.384 ms\\ \>2  \>xorp7-t0 (10.4.0.2)  \>0.596 ms  \>0.499 ms  \>0.527 ms\end{tabbing}\end{alltt}\end{minipage}}\vspace{0.1in}The {\stt traceroute} command can be interrupted by the {\stt Ctrl-C} keycombination.The {\stt show host} commands can be used to display various informationabout the host itself.The {\stt show host date} command can be used to show the host current date:\vspace{0.1in}\noindent\framebox[\textwidth][l]{\scriptsize\begin{minipage}{6in}\begin{alltt}\begin{tabbing}xxxxxxxxxxxxxxxxxxxxxx\=\killuser@hostname> \textbf{show host date}\\Mon Apr 11 15:01:35 PDT 2005\end{tabbing}\end{alltt}\end{minipage}}\vspace{0.1in}The {\stt show host name} command can be used to show the host name:\vspace{0.1in}\noindent\framebox[\textwidth][l]{\scriptsize\begin{minipage}{6in}\begin{alltt}\begin{tabbing}xxxxxxxxxxxxxxxxxxxxxx\=\killuser@hostname> \textbf{show host name}\\xorp2\end{tabbing}\end{alltt}\end{minipage}}\vspace{0.1in}The {\stt show host os} command can be used to show details about the hostoperating system:\vspace{0.1in}\noindent\framebox[\textwidth][l]{\scriptsize\begin{minipage}{6in}\begin{alltt}\begin{tabbing}xxx\=\killuser@hostname> \textbf{show host os}\\FreeBSD xorp2 4.9-RELEASE FreeBSD 4.9-RELEASE \#0: Wed May 19 18:56:49 PDT 2004\\   \>atanu@xorpc.icir.org:/scratch/xorpc/u3/obj/home/xorpc/u2/freebsd4.9.usr/src/sys/XORP-4.9 i386\end{tabbing}\end{alltt}\end{minipage}}\vspace{0.1in}%% \section{Logging in to Unix}%%%% (regarding LiveCD)