trace route command

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# 1  
Old 05-24-2002
Question trace route command

very new to unix whats the trace route command
# 2  
Old 05-24-2002
Hammer & Screwdriver traceroute

traceroute shows you the route packets take to reach the destination address. it shows you the hops or router packets goes through before reaching destination address.

Last edited by hassan2; 05-27-2002 at 10:13 AM..
# 3  
Old 05-24-2002
Give it an Ip to follow. Say from your UNIX box to your laptop. it will show you the path it takes to get there.

Pretty good for diagnostic checking of Network problems.
# 4  
Old 05-26-2002
Originally posted by Kelam_Magnus
Give it an Ip to follow. Say from your UNIX box to your laptop. it will show you the path it takes to get there.

Pretty good for diagnostic checking of Network problems.
does it work it laptop has 10/100 mbps ethernet and unix box 10mbps ethernet????
# 5  
Old 05-28-2002
That doesn't matter. Just run traceroute from any UNIX system to any other IP address. It will work. However, their may be some firewall issues or if you are on a private network it may not be able to complete.

For the most part, it should work.
# 6  
Old 05-28-2002

in my case , i have dell machine and unix box .
dell ip. ethernet is 10/100mbps
unix ip ethernet is 10mbps.
they r connected through 10/100 workgroup switch.
telnet , ping , ftp works fine from dell to unix.
from unix ping says no answer or connection refused?
traceroute gives 1 ***.... ..and so on.
can u help?
# 7  
Old 05-28-2002
It may very well be a network-design issue (ie firewalling, etc).

From the man page on traceroute:
This program attempts to trace the route an IP packet would follow to
some internet host by launching UDP probe packets with a small ttl (time
to live) then listening for an ICMP "time exceeded" reply from a gateway.
We start our probes with a ttl of one and increase by one until we get an
ICMP "port unreachable" (which means we got to "host") or hit a max
(which defaults to 30 hops & can be changed with the -m flag).
Therefore, if your net admin restricts UDP in any direction, or ICMP in any direction, you may very well be impacted by this...
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