1. DHCP Option for Configuring IPv6-in-IPv4 Tunnels DHC WG – 59 th IETF S. Daniel Park soohng.park@samsung.com

2. 59 th IETF – DHC WG, Seoul Background This DHCPv4 option allows a dual host to bootstrap itself into a disconnected IPv6 infrastructure – for example, a dual-stack host on an IPv4-only link. to provide configured tunnel end point automatically for the simple configured tunnel for the IPv4/6 dual host

3. 59 th IETF – DHC WG, Seoul Overview IPv4/6 IPv4IPv6 IPv4 Code Length CTEP Order in Sequence 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | OPTION_CTEP | Len | CTEP Addr1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | CTEP Addr 1 | Subnet Mask 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Subnet Mask 1 | CTEP Addr 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | CTEP Addr 2 | Subnet Mask 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Subnet Mask 2 |... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ IPv6-in-IPv4 IPv6 IPv6 connectivity

4. 59 th IETF – DHC WG, Seoul Comments from ML What exactly is the subnet mask used for ? - Bernie IPv6 network information – Bernie IPv4 address of the tunnel endpoint IPv6 address and prefix-length for the IPv6 network reachable The receiving host encapsulates and forwards any IPv6 datagrams that match the IPv6 prefix in an IPv4 datagram sent to the IPv4 tunnel endpoint address. - Ralph Ambiguous word – Bernie IPv6-in-IPv4 vs IPv6-over-IPv4 Are the prefix length and prefix really needed ? - Bernie

5. 59 th IETF – DHC WG, Seoul Changes from 00 not published because of cutoff. It will be available soon added Multiple Tunnel End Point Considerations section to clarify how both single TEP and multiple TEP are considered… generally single TEP is used for IPv6 connectivity and all packet are reached to the same point in multiple TEP, the routes will be tried in a round robin fashion if an host load-sharing is honored accepted as WG Item ?