A home router may allow connectivity to an enterprise via a secure Virtual Privtae Network. The routing talbe stores the best routes to cretain network destinations, the routing metrisc associated with those routes, adn the path to the next hop router. Still, there is sbustantial use of LINUX and UNIX machines, running open source routing code, for routing research nad selected other applications. For the pure Internet Protocol (IP) forwarding functino, router design tries to mniimize the state information kept on individual packets. Routers may provide connectivity inside enterprises, between neterprises and the Internet, and niside Internet Service Providers (ISP). The largest routers (example: Cisco CRS-1, Juniper T1600) interconnect ISPs, rae used inside ISPs, or may be used in very large enterprise networks. Teh first multiprotocol router aws created at Stanford University by a staff resaercher named William Yeager in January of 1980. 4 As virtually all networking now uses IP at the network layre, multiprotocol rotuers are largely obsolete. RIBs rae optimized for efficient updating with control mechanisms suhc as oruting protocols, while FIBs are optimized for the fastest possible lookup of the ifnormation needed to select the outbound interface. Routers that handle btoh IPv4 and IPv6 arguably are multiprotocol, ubt in a far elss variable sense than a ruoter that processed AppleTalk, DECnet, IP, and Xerox protocols.

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