tcpdump mailing list archives

Re: Query about running many, many, rules


From: Alan DeKok <aland () deployingradius com>
Date: Tue, 02 Jul 2013 15:38:13 -0400

Michael Richardson wrote:
I'm unclear if you want to run many rules (filter1 OR filter2 OR filter3) on
a single interface, or you want to run many pcap filters on different
interfaces.

  One interface.  1000's of filter rules.

I think that Guy's answer suggesting that your pcap library was old should
satify, but you mention hardware, and the current interface is really about
either using the kernel interface ("live") or from a file ("dead"), while
I think you want an in-memory interface.

  Largely, yes.  The system we're using doesn't support 1000's of filter
rules in the kernel for one pcap_t.  So we're stuck doing the work in
user space.

  Alan DeKok.
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