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Bug 7569 - tcpdump options dont work.
tcpdump options dont work.
Status: CLOSED WORKSFORME
Product: Red Hat Linux
Classification: Retired
Component: tcpdump (Show other bugs)
6.0
i386 Linux
medium Severity medium
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Assigned To: Harald Hoyer
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Depends On:
Blocks:
  Show dependency tree / graph
 
Reported: 1999-12-03 16:06 EST by musman
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 1999-12-22 09:49:57 EST
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Description musman 1999-12-03 16:06:24 EST 
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 16:27:59 EST 
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 09:49:59 EST 
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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