<<On Mon, 20 Mar 2000 11:03:07 -0800 (PST), Archie Cobbs <[EMAIL PROTECTED]> said:
[Quoting my original description of icmp_input()'s behavior:]
>> The ICMP never passes certain packets up to raw listeners. These
>> include ECHO REQUEST, TIMESTAMP REQUEST, and SUBNET MASK REQUEST
>> packets -- but not the corresponding replies! So, when you ping the
>> local machine, you will see the ECHO REPLY packets on all raw
>> listners, but not the initial ECHO REQUESTs. When you ping from a
>> remote machine, you never see the ECHO REQUEST packets because the
>> kernel takes care of them, and you never see the ECHO REPLY packets
>> because they are addressed to the other machine.
> Is this a FreeBSD-specific thing, or to other UNIX's have this
> same peculiar behavior?
It was the same in 4.3. I don't have 4.2 sources handy so I can't
check there -- but in any case, the answers to your questions are
``no'' and ``yes''. The raw ICMP socket is defined to only see the
traffic which the kernel is unable to handle itself.
-GAWollman
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