Transcript MobOpts-2
Media Independent Preauthentication Framework for Interdomain Handover Optimization draft-irtf-mobopts-mpa-framework-01.txt Ashutosh Dutta (Telcordia) Victor Fajardo (Toshiba) Yoshihiro Ohba (Toshiba) Kenichi Taniuchi (Toshiba) Henning Schulzrinne (Columbia University) IETF70 MOBOPTS RG Meeting Changes from previous presentation • Based on feedback from IETF 69 at Chicago, comments were incorporated and new draft was submitted as a RG item • Solicited comments from the RG members and expert comments from Christian Vogt and Marco Liebsch • Incorporated these comments and submitted the new version of the draft IETF70 MOBOPTS RG Meeting Overall summary of comments • Strength of this framework – Based on security relationships between a mobile host and different networks – Does not depend on trust or security relationships between administratively separate networks. – Provides advantage in terms of deployment scalability, in particular in a more and more heterogeneous Internet • • • • The draft is of good editorial quality Describes related work and clearly explains how it differs from that Very good work! Lot of things have been considered – Different means for address acquisition, etc. – Individual protocol components and needs have been evaluated thoroughly • Some modifications to existing components, such as address configuration, MM, local routing table management on MNs are needed for MPA to work in a particular system IETF70 MOBOPTS RG Meeting Detailed Comments from Christian (1/2) Comment #1: Why the proactive handover tunnel connects the MN's old PoA with the nAR, and not the MN's new PoA with the oAR? – In case of Inter-domain handoff, SA between network nodes in different domains is a hard assumption – Proactive BU is possible with the tunnel to the nAR – Works with any mobility management protocol Comment #2: How does MPA react in case of quickly fading signal – Description has been added in Section 8.1 IETF70 MOBOPTS RG Meeting Detailed Comments from Christian (2/2) Comment #3: What is the relationship between mobility and transmission Delay – Added description to make clear that one-way transmission delay for the inhandoff packets is dependent upon the buffering modules in MPA Comment #4 Description of jitter is not proper – Sentence has been rephrased as suggested Comment #5 2% packet loss as an average value is may not be valid for handoff – In-handoff packet loss can be 100% – This sentence has been rephrased Comment #6:Optimal condition for the mobile to switch to a specific network • Recommendation on specific metrics (e.g., SNR, Location, Cost) that should be used to decide the handover has been discussed IETF70 MOBOPTS RG Meeting Detailed Comments from Marco (1/2) Comment #1: Description about on-link router advertisement in the runnel to trigger binding update – description about the method for receipt of on-link router advertisement added in Section 7.6 Comment #2: DAD should be part of address configuration not address resolution – Description on DAD has been moved to Section 7.3 – Added new description for stateless auto-configuration Comment #3: Why is the pre-authentication through the previous interface is required – Added few valid scenarios for use of multiple interfaces: Battery power saving, Non-overlapping access, carriers may not allow simultaneous activation of both the interfaces IETF70 MOBOPTS RG Meeting Detailed comments from Marco (2/2) Comment #4: How can one do authentication to CDMA network via WiFi network – Clarified few steps regarding MPA applicability – Depending on the access type, some or all parts of MPA steps would be applied e.g., in WiFi-CDMA operation PPP context can be set up ahead of time Comment #5: What is the delay effect on packets due to proactive tunnel – In-handoff packets over the transient tunnel would be subjected to added delay if the neighboring access networks are far apart in terms of IP routing path • Text has been added to describe the tradeoff between longer packet delay vs. packet loss IETF70 MOBOPTS RG Meeting