Date: Fri, 30 Oct 2009 15:37:25 -0700 From: Chuck Swiger <cswiger@mac.com> To: Sebastian Hyrwall <sh@keff.org> Cc: freebsd-net@freebsd.org Subject: Re: Hi. /31 on ethernet links Message-ID: <BCE5F8B9-D52A-4F58-A5B9-DDDCF78B7D1B@mac.com> In-Reply-To: <4AEB834D.1050907@keff.org> References: <4AEB7AE8.5090101@keff.org> <18C758A7-1908-4D1A-BDCA-80FF7FD8BC22@mac.com> <4AEB834D.1050907@keff.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Oct 30, 2009, at 5:22 PM, Sebastian Hyrwall wrote: >> 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. >> > > 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. Ethernet point-to-point links are normally handled by ppp / pppd in PPPoE mode, but possibly something like: ifconfig en0 inet 192.1.1.10 inet 192.1.1.2 ...would give you a POINTOPOINT link instead. If not, you can probably fake things out by either using a /30 and wrapping the /31 inside, or using a /32 and an explicit default route via your ethernet interface. Regards, -- -Chuck
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?BCE5F8B9-D52A-4F58-A5B9-DDDCF78B7D1B>