Help with tcpdump query
T. Horsnell
tsh at mrc-lmb.cam.ac.uk
Fri Oct 13 15:46:16 UTC 2006
>Hi
>
>Could someone please point out to me where I'm going wrong with the following:
>
>tcpdump -i eth0 not port 22 and not port 53 not ip proto icmp
>
According to my man pages, you need to escape the icmp keyword thus (for C-shell)
tcpdump -i eth0 not port 22 and not port 53 not ip proto \\icmp
It works for me.
To avoid the unresolvable ip addr, either aviod DSN lookups altogether
with -n , or include 'and not host xxx' where xxx is the ip address
you want to skip:
tcpdump -i eth0 not port 22 and not port 53 and not host xxx and not ip proto \\icmp
Cheers,
Terry.
>Additionally there's a client popping up that doesn't havea resolvable
>hostname how can I exclude it with tcpdump?
>
>Thanks in advance
>Dan
>
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