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From: Mills@UDEL.EDU
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  Routers and Internet Protocol #77
Message-ID: <8707141444.a027403@Huey.UDEL.EDU>
Date: Tue, 14-Jul-87 14:44:16 EDT
Article-I.D.: Huey.8707141444.a027403
Posted: Tue Jul 14 14:44:16 1987
Date-Received: Thu, 16-Jul-87 06:52:24 EDT
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John,

My remarks were confined strictly to the local-use issue and only when
the firewall is necessary. It turns out that the fuzzballs use IP protocol
63 (decimal) for routing purposes, so they have to check that field anyway.
Should it be advisable, I have no problem with this overhead in the general
case. It is surely no more intrusive than the address checking suggested
for generic IP gateways on this list and in recent RFCs.

Dave