1. V6OPS WG IETF-72 IPv6 in Broadband Networks draft-kaippallimalil-v6ops-ipv6-bbnet Presented by: David Miles Kaippallimalil John Frank Xia July 2008

2. Problem Statement IPv6 link and addressing models for broadband forum architecture based on TR-101, TR-144: IPv6 prefix with Routed RG. IPv6 prefix with Bridged RG. Not addressed: IPv4/v6 inter-working, PPP connectivity.

3. Terminology A host authorized (transitively) in the provider network (IP Edge), by virtue of a host authenticating to RG, and RG authenticating to IP Edge. Examples include a host at home that connects to a trusted port of the RG (e.g. wired Ethernet connection), or authenticates locally to the RG (e.g. Wi-Fi with local keys). A host that is not trusted in the provider network as a result of the authenticated RG. Such a host authenticates directly with the provider network (IP Edge). Typically nomadic or mobile hosts are untrusted to begin with. CPE (-router) in draft-wbeebee-ipv6-cpe-router UE (user equipment) is an IPv6 host refers to broadband forum architecture specified in TR- 101, TR-144, WT-145. Trusted: Untrusted: RG UE Broadband Network:

4. Scenarios Routed RG AN1 IP Edge Bridged RG AN2 Wi-Fi Aggregation Network Customer Network 1 Customer Network 2 DSL, FTTH WiMAX UE1 UE3 UE2 UE4 UE5 UE6 Connection scenarios: 1.UE attached to trusted port of routed RG (UE1, UE2, UE3) 2.UE attached to bridged RG (UE4, UE5) 3.UE attached to AN (UE6) (Roaming, Nomadic) (Nomadic)

5. Point-to-Point IPv6 Link +-------------+ +------+ +-------+ UE1----| RG1(routing)|------------|... |---------| | +-------------+ | | | | | | | | +-------------+ | AN | | | UE2----|RG2(bridging)|------------|.... |---------|IP Edge| +-------------+ | | | | | | | | UE3-------------------|.... |---------| | +------+ +-------+ |------------------------------------| Point-to-point IPv6 links Point-to-point IPv6 link (unique prefix) in the provider network IP Edge delegates prefix to RG1 (RFC3633). Delegated prefix is unique. (case described in draft-wbeebee-ipv6-cpe-router) IP Edge advertises unique prefix to UE2 following user authentication. (e.g. host is nomadic, uses Wi-Fi to attach to RG, authenticates with IP Edge) Similar to 2, IP Edge advertises unique prefix to UE3 following authC. (e.g. host is nomadic/mobile, uses 802.16 to attach to AN.) PROVIDER NETWORK

6. Shared Prefix IPv6 Link UE1-----\ | +-----------+ +---------+ UE2-----+-------|RG1(routed)|-------(AN)-------| IP Edge | | +-----------+ +---------+ UE3-----/ |---------------| shared link for UE1, UE2, UE3 RG1 advertises the same IPv6 prefix to UE1, UE2, UE3. When network separation is not needed (as may be the case in a home network), shared prefix is one option. A single /64 prefix may in this case be sufficient in the home.

7. Point-to-Point, Shared Prefix Links Provider Network:  requires network separation between subscribers.  Point-to-point prefixes provides network separation (by routing all upstream packets to IP Edge/access router).  Shared prefixes require ND-proxy (or similar) for network separation.  Point-to-point prefix preferred in provider network Home Network:  Does not usually require network separation  Shared link may be bridged (802.1ad) in home router/RG -- no ND proxy required & no network separation.  Link-local address sufficient for local hosts to communicate (does not depend on WAN configuration (router/DCHP) )

8. IPv6 Address Derivation RG, UE derive their IPv6 GUA after user authentication at IP Edge. Routed RG: -configures link-local address on upstream (WAN) interface -RG obtains delegated prefix from IP Edge to advertise to hosts. (based on RFC3633) -RG can be contacted using sub-router anycast address, but needs a GUA on WAN interface. UE (host): -configures link-local address - configures GUA statelessly (RFC4861) or statefully (RFC3315). If host is behind a routed RG, it authenticates & obtains its IPv6 prefix from the RG. If host is behind a bridged RG, it authenticates & obtains its IPv6 prefix from IP Edge.

9. Thank You!

10. Point-to-Point IPv6 Link Routed RG AN1 IP Edge Bridged RG AN2 Aggregation Network Home Network 1 Home Network 2 UE1 UE3 UE2 UE4 UE5 UE6 IPv6 prefix-1 IPv6 prefix-2 IPv6 prefix-3 Route Table ---------------------------------------------------------- UE4-prefix::/64eth1.1.0 UE5-prefix::/64eth1.1.0 UE6-prefix::/64eth1.2.1 MAC FF Table ---------------------------------------------------------- UE4-prefix::/64MAC-UE4 UE4-prefix::/64MAC-UE5 (Roaming) (Nomadic)