On Mon, Feb 28, 2011 at 03:20:42PM +0100, Gert Doering wrote:
- what 6rd implementations are there "out in the market" today? (both provider and CPE side)
I know of (and can are not under NDA) _and_ got my hands on: BR: Cisco ASR1k CPE: AVM FritzBox
- what approach do they take? "always use 32 bits for mapping" or the configurable approach from the i-d quoted above (IPv4MaskLen > 0)?
Cisco IOS (on ASR1k): fully flexible configurable AVM: currently fixed /63 (as they may use routed mode between LAN and WiFi, thus two /64s needed) with full 32bit IPv4 mapping, in future flexible on v4-mapping width and delegated subnet size down to /63 or even /64. Ideally, IFF we would use 6RD, we'd like to have a single /24 block to support full 32bit IPv4 address mapping while providing a /56 to customers. Fiddling around with all your different IPv4 PA aggregates, splitting 6RD domains and trying to find halfway suitable space for those in your "normal" IPv6 allocation to support 6RD is.... well, a significant cost for operational point of view, making 6RD actually not that "rapid" and cheap to deploy. The present RIPE policies do add non-negliable indirect cost to deploy 6RD. At least if your plan is to go proper dual-stack "everywhere" over time and you want to use a nice-and-shiny addressing scheme for your allocation, not disturbed by large 6RD blocks. See other folks' recent comments here. Best regards, Daniel -- CLUE-RIPE -- Jabber: dr@cluenet.de -- dr@IRCnet -- PGP: 0xA85C8AA0