MIP 4 BOF

[Geoff Huston <gih@telstra.net>]

MIP 4 BOF

Deployment focus, looking at experience with implementation and deployment 
of the mobileIP specs and looking at interoperability, progressing base 
mobile IPv4 specs to draft, completion of AAA key exchange for mobile IP, 
AAA NAI completion and MIPv4-AAA review, dynamic HA assignment, and VPNs. 
Milestones enumerated

There appears to be the possibility of giving folk an opportunity to 
revisit mobile IP and start augmenting the mobile IP model, as distinct 
from the deployment focus of the charter. There is also ther problem of 
creep in to other areas. (Tomas Narten did a sterling effort at course 
correction at the start of the BOF!)

Presentation on mobileip-vpn-problem-statement, a design team output with a 
security review done by Radia. Wants to last call this and push it to the 
IESG for publication. The solution update uses an established base, and 
some as yet uncompleted optimizations. The problem is IPSEC to the DMZ of 
an enterprise VPN, and the problem of access point mobility, and how do you 
detect 'inside' and 'outsiode' states. The issue is the IPSEC FA state and 
the need to regenotiate the state on client movement.

There is a certain amount of complexity creep going on here in order to 
undertake IPSEC VPN access and mobility where the internal home agent is 
occluded from external visibility  (IPSEC mobility), and its not entirely 
clear whether these efforts would make mobileIP more attractive to 
deployment or whether it all becomes yet another reason not to deploy. 
Charlie Perkins characterized this as "going from the complex to the 
fantastically complex". Alternatives of using IPSEC tunnel mode as the 
MoileIP tunnel were discussed, but this scenario was not explicitly 
included in the current 3 level drafts.

On the whole the concept of using deployment experience to refine the 
MobileIP specs is a worthy effort, but with the BOF perspective that the 
extensions with respect to VPNs and IPSEC mobility, the WG would need 
careful chairing to dampen down the 'charge ahead' enthusiasm and complete 
the rest of the charter, which in theory is more mindane!.