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[Ipsec] DHCPv6 and CP payload in IKEv2



HI,
I wonder how a IRAC can use
the INTERNAL_IP6_DHCP atrritbue in
a Config reply/set for a DHCP request.
1) 15.4 in RFC3315 (DHCPv6) states, that 
the DHCP server has to discard the request,
if the DUID option does not macht, but
DUID is not supplied to IRAC within Config Reply/set
2) 18.2.1 in RFC3315 states, that the DHCP server will 
command the client to use multicast, if it did
not send a unicast option previously.

So it seems that IRAC has to use the solicitate/advertise
DHCPv6 messages.
Or is 2) solved by interpreting IKEv2 spec in the sense
of being a link specification for IPv6 in the sense of
13. of RFC3315 ?
Best regards, thanks in advance
        Peter


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