ping
sends an ICMP ECHO_REQUEST
packet to the specified host. If the host responds, you get an ICMP packet
back. you can “ping” an IP address to see if a machine is alive. If there is no
response, you know something is wrong.
It's instances like these that make ping
a very useful day-to-day command. It provides a very quick way to see if a
machine is up and connected to the network. The basic syntax is:
|
% ping
www.slackware.com
|
Slackware's
traceroute command is a very useful network diagnostic tool. traceroute
displays each host that a packet travels through as it tries to reach its
destination. You can see how many “hops” from the Slackware web site you are
with this command:
|
% traceroute
www.slackware.com
|
Each
host will be displayed, along with the response times at each host. Here is an
example output:
|
% traceroute
www.slackware.com
traceroute
to www.slackware.com (204.216.27.13), 30 hops max, 40 byte packets
1 zuul.tdn (192.168.1.1) 0.409 ms
1.032 ms 0.303 ms
2 207.171.227.254 (207.171.227.254) 18.218 ms
32.873 ms 32.433 ms
3 border-sf-2-0-4.sirius.com
(205.134.230.254) 15.662 ms 15.731 ms 16.142 ms
4 pb-nap.crl.net (198.32.128.20) 20.741 ms
23.672 ms 21.378 ms
5 E0-CRL-SFO-03-E0X0.US.CRL.NET
(165.113.55.3) 22.293 ms 21.532 ms 21.29 ms
6 T1-CDROM-00-EX.US.CRL.NET
(165.113.118.2) 24.544 ms 42.955 ms 58.443 ms
7 www.slackware.com (204.216.27.13) 38.115 ms
53.033 ms 48.328 ms
|
traceroute
is similar to ping in that it uses ICMP packets. There are several options that
you can specify with traceroute. These options are explained in detail in the
man page.
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