Bug with pcap filters?

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

Hi there



I run Nessus on the same server that we have snort installed on, and

obviously this causes snort to trigger heaps. As I know it's Nessus, I

decided to stop snort triggering by using a pcap filter:



snort .... not esp and not host FQDN_of_Snort_server



This works fine.



However, obviouly that stops snort seeing anyone attacking the snort server

too, so I thought I'd change it to only ignore packets coming FROM the

snort/Nessus server



snort ... not esp and not src host FQDN_of_Snort_server



This doesn't work - snort now triggers when Nessus runs, and the srcip is

definitely the correct IP address. I am wondering if the stream

preprocessors are overriding the filter?



This is snort-2.1.2



-- 

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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