1. IPv4 over 802.16 IP CS draft-ietf-16ng-ipv4-over-802-dot-16-ipcs-01 Basavaraj Patil, Nokia On behalf of Authors: Syam Madanapalli, Ordyn Technologies Soohong D. Park, Samsung Samita Chakrabarti, Azaire Networks 70th IETF - Vancouver, Canada December 2-7, 2007

2. History WG item, presented in the last two IETF meetings WG item, presented in the last two IETF meetings 01 version is available now 01 version is available now Major issue from the last WG meeting is MTU size Major issue from the last WG meeting is MTU size

3. Objective of presentation To update on resolved issues on To update on resolved issues on MTU MTU Other minor comments on the mailing list Other minor comments on the mailing list

4. Subnet Model Point-to-point link between MS and AR Point-to-point link between MS and AR No PPP is used No PPP is used A set of IEEE 802.16 MAC connections (CIDs) represent the p2p link A set of IEEE 802.16 MAC connections (CIDs) represent the p2p link Point-to-point IP link MS1 AR MS2 BS1 MS3 MS4 BS2 ToInternet

5. MTU Maximum value: 2038 octets Maximum value: 2038 octets Total PDU size (2048) - MAC Header (6) - CRC (4) Total PDU size (2048) - MAC Header (6) - CRC (4) Minimum value: 576 octets Minimum value: 576 octets As per RFC 1122 As per RFC 1122 Default: 1440 octets Default: 1440 octets This avoids the fragmentation of packets between BS and AR when using Ethernet as the transport using GRE tunnel (Wimax model) This avoids the fragmentation of packets between BS and AR when using Ethernet as the transport using GRE tunnel (Wimax model) Avoids fragmentation as much as possible between Wimax and other technology networks that use IPSec Tunnels as the link. Avoids fragmentation as much as possible between Wimax and other technology networks that use IPSec Tunnels as the link. GRE Tunnel MS1 AR MS2 BS1 MS3 MS4 BS2 ToInternet

6. Suggestions from the Mailing List ARP behavior ARP behavior Resolution: IPCS works over point-to-point link. But if some legacy IP implementation requires ARP resolution to be performed, it should simulate ARP response internally. (Appendix B) Resolution: IPCS works over point-to-point link. But if some legacy IP implementation requires ARP resolution to be performed, it should simulate ARP response internally. (Appendix B) Adding text for NAT requirement on AR Adding text for NAT requirement on AR Resolution: There is no special NAT requirements for IP over IEEE 802.16. But a generic text is added for addressing private IPv4 addresses for the sake of completeness (Appendix D) Resolution: There is no special NAT requirements for IP over IEEE 802.16. But a generic text is added for addressing private IPv4 addresses for the sake of completeness (Appendix D)