IPv6 Subnet Model Analysis

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IPv6 Subnet Model Analysis

• Syam Madanapalli
• LogicaCMG
• On-behalf of v6subnet Design Team
• Presented by
• Soohong Daniel Park

16ng Interim Meeting, 12, 13-09-2006 Manheim
Germany
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The Design Team Participants

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

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The Goal

• To analyze the IPv6 link models that can be
  applied for the 802.16 based networks
• And recommend preferably one link model for the
  standardization

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The Models Considered

• NBMA Link Model
• Shared Prefix Model
• Point-to-point Link Model
• Unique Prefix Model
• Multicast Capable Link Model
• Ethernet Like Model

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NBMA Link Model
L3
AR
Shared Link
L2
BS
Tunnel
MAC Conn.
L1

• 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
• DAD is performed using Relay DAD

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P2P Link Model

• P2P Link
• Using PPP
• No PPP CS exist
• Using L2 tunnel
• Per MS GRE Tunnel
• VLAN Tag (802.1q)
• May not support sufficient MSs Max. 4K

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Multicast Capable Link Model

• Similar to Ethernet Link Model
• 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

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Prefix Assignment

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

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Address Autoconfiguratio

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

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Duplicate Address Detection

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

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Reuse of existing standards

• All models reuse the existing standards

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On-link Multicast Support

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

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Consistency in IP Link Definition

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

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Packet Forwarding

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

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Effect on Dormant Mode

• NBMA Link Model
• Not affected
• P2P Link Model
• Not affected
• Multicast Capable Link Model
• BS needs to implement multicast filtering

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Changes to Host Implementations

• NBMA Link Model
• None
• P2P Link Model
• ?
• Multicast Capable Link Model
• None

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Changes to Router Implementations

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

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Renumbering

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

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SeND Support

• All models support usage of SeND

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Applicability

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

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