RFC 3056

[francis . arts]

Hi,

I have a question on the relay router in the 6to4 transition model of RFC 3056:

        R1 (6to4 router) -- R2 (IPv4) -- R3 (IPv4) -- R4 (relay router)


Note: R1 is a pure 6to4 router; R2 and R3 are part of the IPv4 cloud; R5 is a relay router.


In the 6to4 model R1 and R4 need to have a 6to4 address. From RFC 3056 I understand that these 6to4 addresses have to be configured on the interface between R1 and R2 (R4 and R3) respectively. I am now puzzled between the following 2 observations:
1) I would also expect to have an IPv6 address configured on R2's end of the R1-R2 interface. After all, only configuring an IPv6 address on 1 of the routers connected to an interface would be a bit strange? A similar remark holds for R3 on the R4-R3 interface.
2) However, no IPv6 address should be assigned to R2 (R3) since R2 (R3) is only IPv4 capable?



Can somebody clarify the apparent contradiction between both statements? Thanks.

        Francis.