[Bro] help for adding new packet filter

Vern Paxson vern at icir.org
Mon Feb 19 10:38:00 PST 2007

> line 1: run-time error: precompile_pcap_filter: pcap_compile((((gre) or (udp)) or (tcp)) or (icmp)): parse error
>  can't compile filter (((gre) or (udp)) or (tcp)) or (icmp)

The problem is that tcpdump (at least my version) doesn't have a "gre"
keyword.  So, to specify that you want to capture GRE traffic, you'll need
to describe it dirctly in terms of the IP "protocol" field (e.g., "tcp"
is the same as "ip proto 6").


More information about the Bro mailing list