[address-policy-wg] Re: Re: IPv6 allocations for 6RD
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Daniel Roesen
dr at cluenet.de
Tue Mar 1 09:42:35 CET 2011
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 at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0
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