Date: Fri, 15 Jun 2007 11:27:38 -0500 From: David DeSimone <fox@verio.net> To: freebsd-net@freebsd.org Subject: Re: VLANs and routing Message-ID: <20070615162738.GA21747@verio.net> In-Reply-To: <20070615104329.GF1173@turion.vk2pj.dyndns.org> References: <f4q05k$f68$1@sea.gmane.org> <20070615104329.GF1173@turion.vk2pj.dyndns.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Peter Jeremy <peterjeremy@optushome.com.au> wrote: > > > But the (somewhat weird) requirements are that the vlan interface on > > machine1 shouldn't have assigned IP address, but the second one > > should. > [...] > > Is this kind of setup even supported? > > I don't see how it could be if machine1 is an IP endpoint: In order > to transmit a packet, it needs to put a source IP address into the > packet - which virtually always comes from the interface. When originating a packet, that is the case. But a forwarded packet already has a source address, which can be left unchanged. As long as routing is working (ARP is not needed, destination is clear, etc), the intermediate interface need not have an IP. - -- David DeSimone == Network Admin == fox@verio.net "It took me fifteen years to discover that I had no talent for writing, but I couldn't give it up because by that time I was too famous. -- Robert Benchley -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFGcr36FSrKRjX5eCoRAnnwAJ4l/TIJPiMsNULHhAoJi6q12Y/vygCggBEe k47dQu/ZHnKNEPTaE9aW4lQ= =pg4w -----END PGP SIGNATURE-----
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