Date: Tue, 07 Jul 1998 09:52:32 -0700 From: David Greenman <dg@root.com> To: Bill Fenner <fenner@parc.xerox.com> Cc: sthomas@lart.net, freebsd-bugs@FreeBSD.ORG, phk@critter.freebsd.dk Subject: Re: kern/7191: FreeBSD 2.2.6 generates Source-route prohibited when not routing Message-ID: <199807071652.JAA27173@implode.root.com> In-Reply-To: Your message of "Tue, 07 Jul 1998 09:42:56 PDT." <98Jul7.094259pdt.177515@crevenia.parc.xerox.com>
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>I'm not sure I agree the ICMP message is bogus. It's true that RFC1122
>says that ICMP source route failed errors are only returned for
>incomplete (i.e. in-transit) source routes, but it also says that
>complete source routes MUST be passed up to the transport layer. Since
>we're not passing the packet up to the transport layer, it makes sense
>to send some kind of ICMP error.
...but hosts shouldn't send ICMP unreachables:
A host MUST silently discard an incoming datagram that is
not destined for the host. An incoming datagram is destined
for the host if the datagram's destination address field is:
So if ipforwarding is 0, and the packet isn't for the local machine, then
it must be silently discarded.
-DG
David Greenman
Co-founder/Principal Architect, The FreeBSD Project
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