Red Hat Bugzilla – Bug 110414
traceroute udp ports
Last modified: 2007-04-18 12:59:36 EDT
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Description of problem:
I have two boxes here running rh 7.3 with the same traceroute package,
same kernel...etc etc. The problem is that one box uses 32769:65535
udp port (as source ports) range when I do a traceroute and the other
box use 1024:65535 udp range (as source ports).
I didn't any other parameter of the box.
Why the second box is using a differente port range?
md5sum signatures are the same.
The second box forces me to change my firewall!! :(
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. run traceroute and tcpdump in the boxes
2. compare the results of tcpdump
Actual Results: Second box must do traceroutes to internet but it is
not able to do that because the firewall rules. Traceroute is using
incorrect source ports
Expected Results: Traceroute must use 32769:65535 udp ports
Try to use traceroute with -p to specify the port range. It seems that
sth else is listening on specific UDP ports so the range is changed.