Date: Sat, 31 Oct 2009 09:01:52 +0100 (CET) From: sthaug@nethelp.no To: sh@keff.org Cc: freebsd-net@freebsd.org Subject: Re: Hi. /31 on ethernet links Message-ID: <20091031.090152.74670981.sthaug@nethelp.no> In-Reply-To: <4AEB834D.1050907@keff.org> References: <4AEB7AE8.5090101@keff.org> <18C758A7-1908-4D1A-BDCA-80FF7FD8BC22@mac.com> <4AEB834D.1050907@keff.org>
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> > A /31 subnet is only defined for point-to-point network links, per: > > > > http://www.rfc-editor.org/rfc/rfc3021.txt > > > > Ordinary ethernet links have BROADCAST flag set instead of POINTOPOINT. > > > > Regards, > Well how do I set the POINTOPOINT flag and remove the BROADCAST-flag on > ethernet links? Or are you implying that it does not belong on ethernet > links :) > Cause Cisco and Linux support /31 (ptp's) on ordinary ethernet links. No, Cisco does not *support* it. They make it available, which is a completely different story. We have asked Cisco repeatedly, through official channels, whether they *support* /31 on Ethernet links. The answer is always that it *may* work, use at your own peril. Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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