MAP (Mapping of Address and Port) is an encapsulation used for providing IPv4 connectivity over IPv6 networks. It is a transition technology towards full IPv6. Other transitioning mechanisms include DS-lite, 6rd and many others. For more, see a list of IPv6_transition_mechanisms.

Introduced in r40822, r40823 (MAP-E) and finalized in r41003 (MAP-T)

see https://forum.openwrt.org/viewtopic.php?id=56336

• MAP: http://tools.ietf.org/html/draft-ietf-softwire-map-10
• MAP-E: http://tools.ietf.org/html/draft-mdt-softwire-map-encapsulation-00
• MAP-T: http://tools.ietf.org/html/draft-mdt-softwire-map-translation-01
• MAP deployment: http://tools.ietf.org/html/draft-ietf-softwire-map-deployment-04

• Cisco MAP deployment paper

MAP at wikipedia