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H. Soliman, G. Tsirtsis, V. Devarapalli, J. Kempf H. Levkowetz, P. Thubert, R. Wakikawa

Dual Stack Support in Mobile IPv6 for Hosts and Routers OR IPv4 traversal for Mobile IPv6 ! draft-ietf-mip6-nemo-v4traversal-00. H. Soliman, G. Tsirtsis, V. Devarapalli, J. Kempf H. Levkowetz, P. Thubert, R. Wakikawa. Objectives.

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H. Soliman, G. Tsirtsis, V. Devarapalli, J. Kempf H. Levkowetz, P. Thubert, R. Wakikawa

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  1. Dual Stack Support in Mobile IPv6 for Hosts and Routers ORIPv4 traversal for Mobile IPv6 !draft-ietf-mip6-nemo-v4traversal-00 H. Soliman, G. Tsirtsis, V. Devarapalli, J. Kempf H. Levkowetz, P. Thubert, R. Wakikawa

  2. Objectives • All goals must apply to hosts and routers (MIPv6 and NEMO). • Allow MIPv6-only to be used by dual stacked MNs. (IPv4 and IPv6 capable nodes). • MIPv6 support for IPv4 CoAs • MIPv6 support for IPv4 HoA/MNP • Support for Static and Dynamic HoA/MNP allocation • NAT detection • NAT Traversal • No Route optimization support

  3. Scenarios • MN and HA supports both IPv4 and IPv6 • MIPv6-only support in MN and HA • HA may be behind a NAT but reachable with a public address. DS MN IPv4 NAT IPv4/v6 DS MN NAT Internet DS HAv6 DS MN IPv6

  4. Extensions to MIPv6 for tunnel setup • IPv4 Home address option (present in the BU) • IPv4 home address ack option (present in BA) • NAT detection option (present in the BA) • Protocol extensions: • Setting up IPv6 n IPv4, IPv4 n IPv6 and IPv4 n IPv4 tunnels • NAT detection and Traversal • Dynamic and static allocation of IPv4 home addresses and MNPs

  5. MIPv6 Solution Overview • IPv4-only network: • MN sends a BU tunneled in UDP and IPv4. BU may contain an IPv4 address option. • HA detects presence of a NAT and includes the NAT detection option in the BA if a NAT were present. • MN receives the BU. If a NAT were present, the MN tunnels all traffic in UDP/IPv4. Otherwise, the traffic is tunneled in IPv4. • Tunnel is setup between the MN’s IPv4 CoA and the HA’s IPv4 address. • IPv6 or Dual stack network: • Normal MIPv6 behaviour with one extension: The MN may add the IPv4 home address option to request an additional binding for the IPv4 HoA/HoP.

  6. Mobility Binding HoAv4 HoAv6 CoAv4 Creating Bindings in MIPv6 IPv4 traffic CNv4->HoAv4 BU(HoAv4, HoAv6, CoAv4) IPv6 Tunnel HAv4->CoAv4 Dual Stack HA Dual Stack MN DS-MIPv6 IPv6 traffic CNv6->HoAv6

  7. NAT Traversal • It is assumed that the HA is configured with the knowledge of whether a NAT is present at the edge of its (home) site. • NAT detection is done during the BU/BA exchange. • The HA compares the src address in the outer header with the IPv4 address in the src address of the BU message. If the two addresses are not the same, a NAT is in the path. • NAT traversal is done using UDP encapsulation. • Keepalives are done by resending the BU before the NAT binding timer expires (probably less than the BCE timer).

  8. Comments/suggestions for next revision • Possibly add another lightweight mechanism for keepalives. • Add movement detection for IPv4-only networks (reference DNAv4). • Clarify the security requirements for the draft and whether anything is needed in addition to RFCs 3775/3776. • Add proxy ARP for HA. • Allow for more than one MNP to be allocated to the MN. • Find Consensus on Pascal’s comments on NAT traversal. • Address Keichi’s comments for processing of IPv4 MNPs and forwarding behviour in the MR. • Find consensus on the best method for transporting IPv4 CoA. • Several editorials.

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