How can I create a filter to capture all ip packets?

[Jeff Wong <jwong () high-tower com>]

Hello,
I am trying to capture all the ip packets coming in on an interface.
I looked at some documentation and I found an example to capture all the packets on
port 23 by specify the filter char *filter = "port 23".  When I tried to compile the
filter it worked fine.
When I tried specifing the filter char *filter = "proto ip" and I tried to compile
the filter it gave me an error.

Any suggestions?

Jeff



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