[bcop] IPv6 deployment for small residential providers
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Jan Zorz @ go6.si
jan at go6.si
Mon Nov 10 12:08:17 CET 2014
On 09/11/14 13:11, William Waites wrote: > Operationally, what does this mean? The most common case is going to > be a single subnet, so how is the gateway going to know which one out > of the /56 to use? Somebody has to pick a /64 to put on the inside > ethernet interface. How is this done? No problem *assigning* a /56 but > using it is another matter. Hi, I've seen all sorts of tricks being made on this topic... Some of them assign /56 to residential customer and: - use wan interfaces unnunmbered (just link-local addreses and installed route on BRAS towards wan ll interface) -or- - use the first /64 for ppp/wan link and the rest for LAN -or- - assign separate /64 for wan link and separate /56 for LAN side. /56 on the LAN side gets auto-configured as on well behaved CPEs there is a script for that. Usually, one address (from first /64) is assigned to local loopback and next /64 is put on first L3 port and next one on next L3 port and so on... you can of course change the ID of where the /64 assignments starts. http://wiki.openwrt.org/doc/uci/network6#downstream.configuration.for.lan-interfaces (an example). Cheers, Jan
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