Fri, Jan 13, 2017 at 04:40:19PM +0900, Lorenzo Colitti: > But it's true that supporting /65-/126 increases the cost of the device. > The extra bits have to go somewhere. I think I've seen hardware that just > converted all prefixes to 128 bit if there was at least one /65 - /126 > prefix in the FIB. That costs money for RAM. Obviously that's silly if > those prefixes are frequent, and you can save that money using better > software engineering - but software engineering costs money too. do such limited devices really need complex ribs/fibs? address, router, neighbors. all of which are needed regardless of the prefix length. > Prefixes > don't cost money, but, they do: https://www.arin.net/fees/fee_schedule.html > and if we know that we won't run out of them do we know this? and 640k RAM is plenty. i'm not convinced. > the problem? rfc6164 s5.1, s5.2. s5.2 applies to your ram-limited devices. end users that want to subnet can't w/o additional /64s.