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Sorry, I should cc IPsec mail list. Comments are sent again.
I have two comments on the draft of IKEv2 Session Resumption:
Well, we've discussed pros and cons of IKE_SA_INIT and IKE_SESSION_RESUME for quite a long time. However, IMHO, the consensus is still not fully achieved on this item. So far, I still prefer to choosing extended IKE_SA_INIT for ticket presenting. This solution is specified in http://tools.ietf.org/html/draft-xu-ike-sa-sync-01
As a summary, the virtues are as follows: - RFC5077 (TLS session resumption) also uses the similar scheme, which extends the message of clienthello with session ticket extension. The extended IKE_SA_INIT solution has the similar way. It's easy to extend the base IKEv2 protocol stack to support session resumption. - Considering the case of failing session resumption, the extended IKE_SA_INIT solution can save one round trip. - As indicated in 4.3.3 IKE_AUTH exchange, IKE_AUTH must be initiated after IKE_SESSION_RESUME. In this sense, the extended IKE_SA_INIT way need less code to be supported compared with IKE_SESSION_RESUME.
The down side:
- some people thought the way of extended IKE_SA_INIT will make the base IKEv2 protocol stack more complex. IMHO, it's an issue of implementation.
Again, I still support to use extended IKE_SA_INIT for ticket presenting instead of IKE_SESSION_RESUME.
2) Maybe I missed some discussions.
There is the case: responder may receives a ticket for an IKE SA that is still active and if the responder accepts it. In one of previous versions of this draft, there once was some description on this case. I know that how a client detects the need for resumption is out of the scope of this draft. But, there is the possibility that IPsec client may be continuously deceived and believe the fail of IPsec gateway. It may continuously present the ticket and update the ticket. In this sense, IMHO, this draft should take care of this case.
On Mon, Aug 31, 2009 at 10:09 PM, The IESG<email@example.com> wrote:
> The IESG has received a request from the IP Security Maintenance and
> Extensions WG (ipsecme) to consider the following document:
> - 'IKEv2 Session Resumption '
> <draft-ietf-ipsecme-ikev2-resumption-07.txt> as a Proposed Standard
> The IESG plans to make a decision in the next few weeks, and solicits
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