On Tue, Mar 01, 2011 at 10:24:46AM +0200, Ahmed Abu-Abed wrote:
According to RFC 5969 for 6rd:
" Embedding less than the full 32 bits of a CE IPv4 address is possible only when an aggregated block of IPv4 addresses is available for a given 6rd domain. This may not be practical with global IPv4 addresses, but is quite likely in a deployment where private addresses are being assigned to CEs. "
So the /64 limitation for 6rd applies when an aggregated block of IPv4 addresses is not being used.
I cannot read that in there. Above paragraphs talks about sub-32bit mapping of IPv4 endpoint addresses. This is orthogonal to what the prefix size for your customer delegation is. Example: your 6RD domain is a /27 IPv4 block. You can serve that with an IPv6 /51 block, giving each 6RD customer a /56. IPv4 /27 == 5 relevant bits (host addressing), 51+5=56. Best regards, Daniel -- CLUE-RIPE -- Jabber: dr@cluenet.de -- dr@IRCnet -- PGP: 0xA85C8AA0