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Re: Issue 226: RFC 3576bis and Renumbering
The problem described in this issue is that a CoA-Request packet cannot be used for renumbering. This is because RFC 3576 defines the Framed-IP-Address, Framed-IPv6-Prefix and Framed-Interface-Id attributes as session identification attributes.
RFC 3576bis-04 advocates use of the Service-Type value of "Authorize-Only" in order to enable renumbering.
It has been pointed out that this is inefficient, requiring two exchanges (a CoA-Request/CoA-ACK and then an Access-Request/Access-Accept) when only one should be required.
I'd like to put forward a potential approach to address this concern, which is to introduce two new attributes, User-IPv4-Address and User-IPv6-Address, in order to identify a session by IP address. This would allow the Framed-IP-Address, Framed-IPv6-Prefix, Framed-Interface-Id and Delegated-IPv6-Address attributes to be included for the purpose of renumbering.