Patch for mtp2 filtering

[Florent.Drouin () alcatel-lucent fr]

      Hello,


Here is a short patch to implement filtering for MTP2 frames on SS7.
You can now use "fisu", "lsu", or "msu" to filter the MTP2 messages at
libpcap level.
In most of the case, the filter to use will be "!fisu", to have only the
significants frames.

Additionaly, ou can use the already existent filters for MTP3
like "opc 9646 or dpc 9646"

The patch is based on libpcap-2006.12.13, with diff commands, but not from
the cvs release.

(See attached file: mtp2_filtering.tar.gz)

Regards
Florent
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