Bug 7569 - tcpdump options dont work.
Summary: tcpdump options dont work.
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: tcpdump
Version: 6.0
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Harald Hoyer
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 1999-12-03 21:06 UTC by musman
Modified: 2008-05-01 15:37 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 1999-12-22 14:49:57 UTC

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Description musman 1999-12-03 21:06:24 UTC
I have identified a problem trying to use tcpdump.

The following command works just fine under redhat 5.x, Solaris, IRIX,
etc. but fails under several different installations of redhat 6.0. I
haven't yet had a chance to replicate it under redhat 6.1.

>tcpdump '(icmp[0] == 8 ) or (port sunrpc)'
tcpdump: unknown port 'sunrpc'

I compiled the same version of tcpdump source under both releases of
redhat, and the redhat 5.x version even runs under 6.0, but I get the
same error as above.

Comment 1 Jeff Johnson 1999-12-03 21:27:59 UTC
There appears to be a getservbyname call that has been taken out, probably
to speed up tcpdump performance.

Meanwhile try putting the port number in numerically (use "111" instead of
"sunrpc"). I suspect that will work ...

Comment 2 Jeff Johnson 1999-12-22 14:49:59 UTC
Your command works in tcpdump-3.4-17 from Raw Hide. If it still doesn't
work for you, check your /etc/nsswithc.conf setup.

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