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==V4-via-v6 routing==
''V4-via-v6'' routing<ref>{{Cite IETF|title=IPv4 routes with an IPv6 next hop|draft=draft-chroboczek-intarea-v4-via-v6-03|last1=Chroboczek|first1=Juliusz|last2=Kumari|first2=Warren|last3=Høiland-Jørgensen|first3=Toke|date=Jan 2025}}</ref> is a technique where IPv4 addresses are assigned to end hosts only while intermediate routers are only assigned IPv6 addresses. IPv4 routes are propagated as usual, and no packet translation or encapsulation is employed, but use an IPv6 next hop. V4-via-v6 reduces the amount of management required, since the core network only needs to be assigned IPv6 addresses, but still requires that the core network be able to forward IPv4 packets.
V4-via-v6 is defined for the [[Border Gateway Protocol]] (BGP)<ref>{{Cite IETF|title=Advertising IPv4 Network Layer Reachability Information with an IPv6 Next Hop|rfc=5549|last1=Le Faucheur|first1=François|last2=Rosen|first2=Eric|date=May 2009}}</ref> and the [[Babel (protocol)|Babel routing protocol]].<ref>{{Cite IETF|rfc=9229|title=Pv4 Routes with an IPv6 Next Hop in the Babel Routing Protocol|last1=Chroboczek|first1=Juliusz|date=May 2022}}</ref> It has been implemented the [[Bird Internet routing daemon]]<ref>{{Cite web |last=Rammhold |first=Andreas |date=December 15, 2020 |title=[RFC] Babel: Add v4viav6 Support |url=https://bird.network.cz/pipermail/bird-users/2020-December/015082.html |access-date=2023-01-15 |website=BIRD Internet Routing Daemon |archive-date=2022-12-29 |archive-url=https://web.archive.org/web/20221229084844/https://bird.network.cz/pipermail/bird-users/2020-December/015082.html |url-status=live }}</ref> and in [[Babel (protocol)#Implementations|''babeld'']].<ref>{{Cite web |last=Chroboczek |first=Juliusz |date=May 5, 2022 |title=[Babel-users] ANNOUNCE: babeld-1.12 |url=https://alioth-lists.debian.net/pipermail/babel-users/2022-May/003963.html |access-date=2023-01-15 |website=Debian Alioth Lists |archive-date=2022-12-29 |archive-url=https://web.archive.org/web/20221229084813/https://alioth-lists.debian.net/pipermail/babel-users/2022-May/003963.html |url-status=live }}</ref>
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