Hi Remi,
On 11/02/2013, at 9:13 PM, Rémi Després <[email protected]> > ... >> So if I understand it correctly, if a PE-CE link already has a /127 prefix >> assigned to it- and we wanted to use the CE as a 4rd CE, we'll have to >> assign an additional IPv6 prefix to the CE with 64-bit IIDs? >> >> Pls share little detail with me in a scenario where a SP already has /127 >> with CEs and 4rd is needed from the CE > > According to RFC 6164, /127 prefixes are used ONLY on inter-router link. > They cannot be used as customer-site IPv6 prefixes which, to comply with > https://tools.ietf.org/html/rfc4291#section-2.5.1, MUST permit 64-bit IIDs. > > Each 4rd CE MUST therefore be delegated at least one IPv6 prefix having at > most 64 bits (this doesn't depend on its WAN link having or not a /127). > > RD Yes 6164 is only for inter-router links I was under the impression that 4rd CE might use the WAN IPv6 address for stateless tunnelling of IPv4 inside IPv6 Maybe this was a misunderstanding(?) Or is it really upto the operator whether he wants to leverage the CE WAN IPv6 prefix or the allocated IPv6 prefix routed to the CE site If the CE WAN happens to be a /64 prefix, could the 4rd leverage that? What is the recommendation there Regards, Usman
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