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From: tmallory@CCV.BBN.COM.UUCP
Newsgroups: comp.protocols.tcp-ip
Subject: Re: ICMP echo
Message-ID: <8704301720.AA14575@ucbvax.Berkeley.EDU>
Date: Thu, 30-Apr-87 13:22:47 EDT
Article-I.D.: ucbvax.8704301720.AA14575
Posted: Thu Apr 30 13:22:47 1987
Date-Received: Fri, 1-May-87 05:29:12 EDT
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Bob,

The LSI-11 gateways already have much of the one-way functionality you
probably need.  The gateway will send a trap message for each ICMP echo reply
received (you can turn this off).  The trap messages are timestamped (internal
format, but adequate for inter-packet arrivals) and include, among other
things, the 16-bit IP id field so that individual packets may be watched.  Of
course, you need access to the INOC...

Perhaps a little more work is needed.

Cheers,

Tracy