Using /31 for router links

George Bonser gbonser at
Sat Jan 23 04:45:03 UTC 2010

> ARP is still required on ethernet links, so that the MAC address can
> discovered for use in the ethernet frame header. /31 does not change
> the behavior of ARP at all.
> --
> Nathan Ward

I often manually configure the MAC addresses in static fashion on
point-to-points to eliminate the ARPing but that is nothing unique to a
/31.  It does eliminate the need for ARP, though.

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