On Tue, 26 Jan 2010, Igor Gashinsky wrote:
Matt meant "reserve/assign a /64 for each PtP link, but only configure the first */127* of the link", as that's the only way to fully mitigate the scanning-type attacks (with a /126, there is still the possibility of ping-pong on a p-t-p interface) w/o using extensive ACLs..
Anyways, that's what worked for us, and, as always, YMMV...
That's still relying on the fact that your vendor won't implement subnet-router anycast address and turn it on by default. That would mess up the first address of the link. But I suppose those would be pretty big ifs. -- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings