tcpdump question (was Re: [vox-tech] tight-vnc, can't ping box fromwindows)
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tcpdump question (was Re: [vox-tech] tight-vnc, can't ping box fromwindows)
On Thu, 27 Jan 2005, Peter Jay Salzman wrote:
> On Thu 27 Jan 05, 8:10 AM, Peter Jay Salzman <p@dirac.org> said:
[...]
> BTW, a question to the list. The man page claims the expression to listen
> to icmp pings should be:
>
> tcpdump ip proto icmp
>
> But that gave a parse error. By trial and error, I found this works:
>
> tcpdump icmp
>
> Am I reading the man page wrongly or is the man page wrong?
There is a warning about this in my manpage... you'll have to decide where
your problem is:
ip proto protocol
True if the packet is an IP packet (see ip(4P)) of protocol type
protocol. Protocol can be a number or one of the names icmp,
icmp6, igmp, igrp, pim, ah, esp, vrrp, udp, or tcp. Note that the
identifiers tcp, udp, and icmp are also keywords and must be escaped
via backslash (\), which is \\ in the C-shell. Note that this
primitive does not chase the protocol header chain.
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