1. IPv6 Neighbor Discovery Protocol for Common Prefix Allocation Hongseok Jeon, ETRI Junghoon Jee, ETRI 65 th IETF 16ng BoF ( draft-jeon-ipv6-ndp-ieee802.16-01.txt )

2. 2 Goal and Scope Goal –Support conventional host-side operations of IPv6 Neighbor Discovery Protocol without any modification on the 802.16 network. –Single IPv6 stack that can operation over multiple different access networks. –Support both IPCS and Ethernet CS Scope –All SSs served by a specific AR share the Common IPv6 prefix

3. 3 Issues of NDP over 802.16 On-Link issue –IPv6 NDP “On-link” determination by performing a longest prefix match SSs sharing common prefix can be said to on-link IP nodes –IEEE 802.16 Connection of 802.16 always ends at the BS No direct communication among SSs Multicast issue –IPv6 NDP Delivered based on link-local multicast address –IEEE 802.16 No dedicated CIDs for multicasting IPv6 packets No native support for multicasting IPv6 packets among SSs

4. 4 Proposed Solution IPv6 NDP Relay for solving on-link issue Multicast Emulation for solving multicast issue

5. 5 IPv6 NDP Relay MRP (Multicast Relaying Part) –Function to relay link-local multicast data. IP CS –MRP can be located in AR –Relay packets which begin with “FF02” in IPv6 address –Note that packets addressed “FF02::2” is not relayed because they are link-local all-routers multicast data Ethernet CS –MRP can be located in BS or AR –Relay packets which begin with “33-33” in Eth. address –Note that packets addressed “33-33-00-00-00-02” is not relayed because of same reason as IP CS

6. 6 Multicast Emulation Common CID (CCID) –CCID is CID for IPv6 NDP message transmission –There is just one CCID in BS, not multiple –CCID is shared by all SSs under the same BS Replicated Unicast –IPv6 NDP msg. are delivered by repeated unicasts. –IPv6 NDP msg. with all-node multicast address. By replicated unicasts via all the established CID on BS –IPv6 NDP msg. with solicited-node multicast address. By replicated unicasts via CID of corresponding SSs. BS can build up mapping table between CID and solicited- node multicast address with SS’s MAC address.