3Com OfficeConnect Remote 510 User Manual

Contents

Routing IP and IPX A-11IPX RoutingNovell IPX also uses RIP for routing purposes.Although it is similarly named to the IP equivalent, ituses a different protocol. IPX RIP broadcastsdatagrams out onto the network every sixtyseconds. Upon receipt of a RIP datagram, a routeradds one to the hop count of each route advertisedand broadcasts a RIP datagram to the othernetworks, with which it is connected.The cost of a route in an IPX network is determinedby the metric known as ticks. In a LAN onlyenvironment this is the hop count plus one, e.g.three hops or four ticks. For an internetworkconnected via a WAN or ISDN links, the tick count isfactored on the speed of the WAN link.We saw above the common network numberingscheme employed for a bridged network. Byemploying routing, LAN A, LAN B and LAN C becomethree separate networks on a network. The networknumbering must reflect that situation.In a Novell IPX environment we could allocate IPXnetwork numbers 00000111 to LAN A, 00000222 toLAN B and 00000333 to LAN C. Having configuredthe ports of the OfficeConnect Remote to acceptthis protocol, routing will now occur between theremote network servers and workstations butaddressed by different network numbers.It should be noted that NetWare 3.X and later, usesthe concept of internal IPX addresses, which issomewhat similar to network addressing. Theinternal address refers to the internal network withinthat server allowing internal processes tocommunicate. These numbers must be unique forall servers right across the network. Althoughnetwork servers may appeared wired correctly, andin other respects seem to be working correctly,duplicated internal IPX addresses will not allowcorrect operation.NetWare has a hop count limitation imposed by theRIP. On an IPX network a data packet can cross amaximum of fifteen routers before being discarded.Rc.bk : RCAPPA.FRM Page 11 Thursday, July 10, 1997 9:53 AM