draft-arunt-prefix-delegation-using-icmpv6-00.txt is an interesting approach to prefix delegation. Looking at it objectively, it appears to me that this protocol largely duplicates the prefix delegation functions in RFC 3633, at an approximately equivalent cost in message exchanges and implementation complexity. Further, I believe there are several issues in prefix delegation that are addressed in RFC 3633, but are not addressed as well or at all in draft-arunt-prefix-delegation-using-icmpv6-00.txt:
As I understand the protocol, there is a four message exchange between the RR and the DR for prefix delegation, which is equivalent to the message exchange in RFC 3633. In draft-arunt-prefix-delegation-using-icmpv6-00.txt, the RR must be configured with the address of the DR, while RFC 3633 uses a multicast discovery mechanism.
The mechanism for CPE identification seems inadequate, especially as compared to RFC 3633. How is the uniqueness of the 32-bit identifier draft-arunt-prefix-delegation-using-icmpv6-00.txt ensured? In RFC 3633, there are several ways in which a DUID for a device can be formed, with guarantees of uniqueness among all devices.
Is there a way in draft-arunt-prefix-delegation-using-icmpv6-00.txt for the DR to communicate a preferred lifetime to the RR?
How does draft-arunt-prefix-delegation-using-icmpv6-00.txt address the security issues raised in section 9? There is also a security exposure in prefix revocation (section 7.2), where an attacker spoofing the identity of the DR can cause an RR to stop using previously delegated prefixes.
I think RFC 3633 meets the requirements from the prefix delegation requirements document and includes the features needed for deployment of prefix delegation service. We have multiple implementations and have demonstrated interoperability, and RFC 3633 prefix delegation is already in commercial deployment, so I don't see the need at this time to pursue an alternative prefix delegation protocol.
- Ralph
At 08:11 PM 5/1/2004 +0530, Arun Thulasi wrote:
Hello All,
We've submitted a draft that describes a mechanism for Prefix Delegation using ICMPv6 by satisfying the requirements mentioned in Requirements for IPv6 prefix delegation (draft-ietf-ipv6-prefix-delegation-requirement-04.txt) ..
Do let us know your comments and suggestions on the draft ..
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