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Mapping of Address and Port
open-in-new
<p>Mapping of Address and Port (MAP) is a proposal that combines <a href="/facts/Address_plus_Port/kpk2j9Cl">A+P</a> port address translation with the tunneling of legacy IPv4 protocol packets over an ISP's internal IPv6 network. </p><p>MAP uses the extra bits available in the IPv6 address to contain the extra port range identifier bits of the A+P addressing pair that cannot be encoded directly into the IPv4 address, thus eliminating the need for "port routing" within the carrier network by leveraging the provider's own IPv6 rollout. </p><p>In effect, MAP is an (almost) stateless alternative to <a href="/facts/Carrier-grade_NAT/e9QtbwmN">Carrier-grade NAT</a> and <a href="/facts/DS-Lite/bIsav5rv">DS-Lite</a> that pushes the IPv4 IP address/port translation function (and therefore the maintenance of NAT state) entirely into the existing customer premises equipment IPv4 NAT implementation, thus avoiding the NAT444 and statefulness problems of carrier-grade NAT. </p>