March 2012
Beginner to intermediate
230 pages
7h 27m
English
Content preview from Linux Pocket Guide, 2nd Edition
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Name
traceroute — stdin stdout - file -- opt --help --version
Synopsis
traceroute [options]host[packet_length]
The traceroute command
prints the network path from your local host to a remote host, and
the time it takes for packets to traverse the path.
$ traceroute yahoo.com 1 server.example.com (192.168.0.20) 1.397 ms ... 2 10.221.16.1 (10.221.16.1) 15.397 ms ... 3 gbr2-p10.cb1ma.ip.att.net (12.123.40.190) 4.952 ms ... ... ... 16 p6.www.dcn.yahoo.com (216.109.118.69) * ...
Each host in the path is sent three “probes” and the return
times are reported. If five seconds pass with no response, traceroute prints an asterisk. Also,
traceroute may be blocked by
firewalls or unable to proceed for various reasons, in which case it
prints a symbol:
|
Symbol |
Meaning |
|---|---|
|
|
Fragmentation needed. |
|
|
Host unreachable. |
|
|
Network unreachable. |
|
|
Protocol unreachable. |
|
|
Source route failed. |
|
|
Communication administratively prohibited. |
|
|
ICMP unreachable code
|
The default packet size is 40 bytes, but you can change this
with the final, optional packet_length
parameter (e.g., traceroute myhost
120).
Useful options
|
|
Numeric mode: print IP addresses instead of hostnames. |
|
|
Change the timeout
from five seconds to |
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