From: Copper, Steve (scopper@westernpower.co.uk)
Date: Tue May 28 2002 - 08:45:37 EDT
Hi all,
Whenever we try and issue a traceroute command from our system (5.1a pk1
configured to use DNS) using the short name we are getting timed out
responses. The network people have put a sniffer on this and captured a
trace. This shows that the server is querying the DNS server for the ip
address, doing a reverse lookup on it, and then starts the traceroute. The
traceroute succeeds on the first hop (3 times), succeeds on the second hop
(once) and then fails to get any further as it tries to traceroute to
0.0.0.0.
However when we use the fully qualified domain name the traceroute succeeds
all the way to the end point with no time outs. The DNS configuration is set
to check local hosts then DNS. The local hosts file has entries for the
short name that we are trying to get to.
The version of traceroute that we are using is 3.13-14 (obtained from a "ls
-l /usr/sbin/traceroute"). This problem only occurs between servers that are
on different subnets.
We have also tested this out on a version 4.0F system that is not set up to
use DNS. Using this traceroute it succeeds all the way to the end point,
using the short name.
Would any of you have experienced this or offer an explanation as to why it
loses the IP address.
Thanks in advance,
Steve Copper
> The .prn file can be imported into Excel (use comma as delimitter and " as
> text qualifier) but only shows the summary details.
>
> The .cap file can be viewed with a sniffer or probably any other network
> analyzing tool.
>
> <<traceroute-fail.cap>> <<traceroute-fail.prn>>
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