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AURP
AppleTalk Update-based Routing Protocol (AURP) facilitates routing updates within AppleTalk internetworks, allowing geographically dispersed Apple networks to exchange routing information efficiently. It was primarily used to enable communication over wide area networks by encapsulating AppleTalk packets within IP, supporting AppleTalk's expansion beyond local segments..
AppleTalk Update-based Routing Protocol (AURP) was developed by Apple to extend AppleTalk networking capabilities over IP-based wide area networks (WANs).
It works by encapsulating AppleTalk data packets inside IP packets, effectively tunneling AppleTalk traffic across IP networks, thereby enabling the connection of distant AppleTalk networks without relying exclusively on native AppleTalk WAN links.
AURP routers, known as tunnel endpoints, maintain AppleTalk routing tables and exchange routing update packets via UDP or TCP on port 387. This supports dynamic routing updates, helping maintain up-to-date path information between AppleTalk subnets and ensuring consistency across the internetwork.