I'm using Nfsen and am trying to view flows that contain icmp type 3 code 4 messages (Needs fragmenting but DF bit set).

I tried

proto ICMP and icmp[0]=3 and icmp[1]=4

but it doesn't appear to work. Is there a specific filter for that?

--
Regards,

Giles Coochey, CCNP, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 7983 877438
http://www.coochey.net
http://www.netsecspec.co.uk
gi...@coochey.net
        


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