Mobility in a Dual Stack Internet draft-ietf-mip6-dmip-problem

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Mobility in a Dual Stack Internet
draft-ietf-mip6-dmip-problem

• G.Tsirtsis, H.Soliman _at_flarion.com

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The problem

• MIPv4 allows IPv4 node to move in IPv4 networks
• MIPv6 allows IPv6 node to move in IPv6 networks
• Internet is a mixture of IPv4, IPv6 and Dual
  Stack networks
• Use of MIPv4 and MIPv6 simultaneously adds
  signalling overheads and does not allow MNs to be
  reachable on both IPv6 and IPv4 HoAs all the
  time.

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Problem

• MN supports both MIPv4 and MIPv6
• A lot of overheads
• Erratic connectivity
• Optimized Mobility Management near-impossible

IPv4
MIPv6
MIPv4
HAv4
IPv4/v6
MIPv4
Internet
MIPv6
HAv6
MIPv6
MIPv4
IPv6
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Solution Strategy

• Use MIP as migration tool
• Use the tunneling capability of Mobile IP to
  forward both IPv4 and IPv6 traffic over the same
  Mobile IP created tunnel.
• MIPv4
• Allow IPv4 and IPv6 HoAs to bind to an IPv4 CoA
• MIPv6
• Allow IPv4 and IPv6 HoAs to bind to an IPv4 or
  IPv6 CoA (We cant guarantee that IPv6 CoA is
  always available)
• MNs can use either MIPv4 only or MIPv6 only

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MIPv6 Solution framework

• NAT detection and traversal
• No NAT implies IP in IP tunnelling of IPv4 in
  IPv6 or Vice Versa, depending on the access
  network.
• Presence of NAT implies UDP tunnelling.
• Two main components of solution
• NAT detection and traversal
• Flexible Tunnel setup to allow IPv4 in IPv6 or
  IPv6 in IPv4.

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Creating Bindings in MIPv6
IPv4 traffic CNv4-gtHoAv4
BU(HoAv4, HoAv6, CoAv6)
IPv6 Tunnel HAv6-gtCoAv6
Dual Stack HA
Dual Stack MN DS-MIPv6
IPv6 traffic CNv6-gtHoAv6
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Next steps for draft

• Add new terminology
• IPv4/6 capable/enabled
• MIPv6/MIPv6 enabled
• Call for WG last call.