IPv6 Subnet Model Analysis Syam Madanapalli LogicaCMG On-behalf of v6subnet Design Team Presented by Soohong Daniel Park

The Design Team Participants Dave Thaler Dave Thaler David Johnston David Johnston Junghoon Jee Junghoon Jee Max Riegel Max Riegel Myungki Shin Myungki Shin Syam Madanapalli. Syam Madanapalli. James Kempf James Kempf Behcet Sarikaya Behcet Sarikaya Basavaraj Patil Basavaraj Patil JinHyeock Choi JinHyeock Choi 16ng chairs 16ng chairs – Gabriel Montenegro – Soohong Daniel Park Shepherding AD Shepherding AD – Jari Arkko

The Goal To analyze the IPv6 link models that can be applied for the based networks To analyze the IPv6 link models that can be applied for the based networks And recommend preferably one link model for the standardization And recommend preferably one link model for the standardization

The Models Considered NBMA Link Model NBMA Link Model – Shared Prefix Model Point-to-point Link Model Point-to-point Link Model – Unique Prefix Model Multicast Capable Link Model Multicast Capable Link Model – Ethernet Like Model

L3 L2 L1 BS AR Tunnel MAC Conn. Shared Link NBMA Link Model The AR, Multiple BSs attached to the AR and all MSs attached to these BSs forms an IP Link The AR, Multiple BSs attached to the AR and all MSs attached to these BSs forms an IP Link One or more prefixes are assigned to the link One or more prefixes are assigned to the link DAD is performed using Relay DAD DAD is performed using Relay DAD

P2P Link Model P2P Link P2P Link – Using PPP No PPP CS exist No PPP CS exist – Using L2 tunnel Per MS GRE Tunnel Per MS GRE Tunnel – VLAN Tag (802.1q) May not support sufficient MSs; Max. 4K May not support sufficient MSs; Max. 4K P2P Link 2 P2P Link 2 MS1AR Tunnel MAC Conn. MS3 MS2 P2P Link 1 P2P Link 1 Tunnel MAC Conn. P2P Link 3 P2P Link 3 Tunnel MAC Conn. BS

Multicast Capable Link Model Similar to Ethernet Link Model Similar to Ethernet Link Model Supports full multicast with Bridging Supports full multicast with Bridging BS is required to do multicast filtering for not to deliver unwanted packets to MSs that are not part of the multicast group BS is required to do multicast filtering for not to deliver unwanted packets to MSs that are not part of the multicast group MS1 AR1 MS3 MS2 BS2 BS1 AR2 MS4

Prefix Assignment NBMA Link Model NBMA Link Model – All MSs share one ore more prefixes that are assigned to the link P2P Link Model P2P Link Model – One or more prefixes are assigned to an MS Multicast Capable Link Model Multicast Capable Link Model – All MSs share one ore more prefixes that are assigned to the link

Address Autoconfiguratio All link models support standard IPv6 address autoconfiguration methods defined in RFC 2462 and DHCPv6 All link models support standard IPv6 address autoconfiguration methods defined in RFC 2462 and DHCPv6

Duplicate Address Detection NBMA Link Model NBMA Link Model – Relay DAD – Based on Address Cache P2P Link Model P2P Link Model – DAD is required for link local addresses between MS and AR Multicast Capable Link Model Multicast Capable Link Model – As defined in RFC 2462

Reuse of existing standards All models reuse the existing standards All models reuse the existing standards

On-link Multicast Support NBMA Link Model NBMA Link Model – AR can provide proxying – Selective multicast P2P Link Model P2P Link Model – Only two nodes exists on the link Multicast Capable Link Model Multicast Capable Link Model – Full support for multicast

Consistency in IP Link Definition NBMA Link Model NBMA Link Model – External and link local traffic needs to be differentiated P2P Link Model P2P Link Model – Either PPP or per MS GRE tunnel is required Multicast Capable Link Model Multicast Capable Link Model – Full compliance to RFC 2461

Packet Forwarding NBMA Link Model NBMA Link Model – External packets are routed – On-link packets are bridged P2P Link Model P2P Link Model – Works normally Multicast Capable Link Model Multicast Capable Link Model – Location of the bridging AR – for WiMAX Networks AR – for WiMAX Networks

Effect on Dormant Mode NBMA Link Model NBMA Link Model – Not affected P2P Link Model P2P Link Model – Not affected Multicast Capable Link Model Multicast Capable Link Model – BS needs to implement multicast filtering

Changes to Host Implementations NBMA Link Model NBMA Link Model – None P2P Link Model P2P Link Model – ? Multicast Capable Link Model Multicast Capable Link Model – None

Changes to Router Implementations NBMA Link Model NBMA Link Model – Relay DAD Address Cache Address Cache – May not complete due to packet loss etc P2P Link Model P2P Link Model – Unique prefix assignment Multicast Capable Link Model Multicast Capable Link Model – Bridging is required

Renumbering NBMA Link Model NBMA Link Model P2P Link Model P2P Link Model – more signaling traffic comparing with shared prefix model Multicast Capable Link Model Multicast Capable Link Model

SeND Support All models support usage of SeND All models support usage of SeND

Applicability NBMA Link Model NBMA Link Model – Mobile WIMAX and WiBro P2P Link Model P2P Link Model – Mobile WIMAX and WiBro Multicast Capable Link Model Multicast Capable Link Model – Fixed and Nomadic deployment