IPv6 Multihoming without Network Address Translation

Document Type Replaced Internet-Draft (individual)
Last updated 2011-09-27 (latest revision 2011-03-29)
Replaced by draft-ietf-v6ops-ipv6-multihoming-without-ipv6nat
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Network Address and Port Translation (NAPT) works well for conserving global addresses and addressing multihoming requirements, because an IPv4 NAPT router implements three functions: source address selection, next-hop resolution and optionally DNS resolution. For IPv6 hosts one approach could be the use of IPv6 NAT. However, NAT should be avoided, if at all possible, to permit transparent host-to- host connectivity. In this document, we analyze the use cases of multihoming. We also describe functional requirements for multihoming without the use of NAT in IPv6 for hosts and small IPv6 networks that would otherwise be unable to meet minimum IPv6 allocation criteria.


Ole Troan (ot@cisco.com)
David Miles (david.miles@alcatel-lucent.com)
Satoru Matsushima (satoru.matsushima@tm.softbank.co.jp)
Tadahisa Okimoto (t.okimoto@rdc.west.ntt.co.jp)
Dan Wing (dwing@cisco.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)