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TCPDump Fails
By Jeffrey Howard
All rights reserved unless noted otherwise
The title for this IAQ entry is vague, I know. I'm quite sure that TCPDump can fail any number of ways from the command line if your configuration is bogus. There is one in particular that I'm thinking of here, though. TCPDump fails with the error:
tcpdump: socket: Socket type not supported
Platform
This problem struck just after I'd upgraded a RedHat 6.0 system to kernel version 2.2.11.
Solution
This error was, in my case, an indication of a missing line from /etc/modules.conf. Try adding the following:
alias net-pf-17 af_packet
The alias should be enough for TCPDump to find the module it needs.
This information is provided "as is," with no warranty or guaranty. The IAQ pages have not been maintained in some time; they're being kept up because, judging by the traffic and link-backs, people still find them useful.
Copyright 1998-2004 by Jeffrey Howard and Heather Grove, except where stated otherwise.