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
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