Re: 31-Bit IPv4 Prefixes

Lee Johnston wrote:
Hi all,

We've just been allocated a /31 for a point-to-point over ethernet. Any idea if FreeBSD supports 31-bit prefixes as per RFC 3021? All I'm getting are:

arp: 00:02:4a:9c:b8:81 attempts to modify permanent entry for xx.xx.xx.xx on em2.3211


It is likely that the /31 is not routed through your pppoe tunnel but instead assigned to your pppoe tunnel. Probably they expect you to use those two addresses in combination with NAT.
Routed operation is usually only possible (without trickery) on /30 or larger. But perhaps your /31 falls neatly within a /30 and they did not route the network/broadcast address?
Why not just ask your provider how you were thought to use these addresses? You are the customer, you cannot be expected to be the routing wiz on *their* network. I always ask anyway, the explanations are sometimes colorful but often i hear "oh, wait a minute, this doesn't make sense! hang on...".

--
Sten Daniel Soersdal
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