Does snort "sniff" differently than tcpdump?

[Jason Haar <Jason.Haar () trimble co nz>]

I've got a weird one.

I have a few hosts hanging off a 10/100 hub (not switch). Most are
configured to be 10Mb, but one is 100M (the sniffer host is 10 BTW). If I
sniff with tcpdump, I can see all the traffic to/from *all* the hosts - not
just the 10M ones. However, snort doesn't trigger on rules for the sole
100Mb host that it does trigger on for the 10M hosts.

Any ideas? e.g. could this be a libpcap issue? (i.e. tcpdump doesn't appear
to use libpcap, whereas snort does)

RH 7.1 + snort-1.9.1/libpcap-0.6.2-11.7.1.0

-- 
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1


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