[Snort-users] Using BPF Filters for GRE, OSPF, BGP, IGMP

Frank Knobbe frank at ...9761...
Sun Apr 4 21:30:01 EDT 2004

On Sun, 2004-04-04 at 20:21, Aaron wrote:
> I know how to specify networks and hosts in my BPF filter file, though 
> am not sure how to prevent snort from ever seeing GRE, OSPF, IGMP, 
> IPSec traffic, etc...
> Does anyone know how?

man tcpdump

Says right there...  ip and not proto 47  (for GRE for example). 50 and
51 for IPSec. See /etc/services for the rest. 


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