Chapter 13Configuring IPIntroductionThe IP functions in the FRM support dynamic routing of IP (internet protocol) trafficamong IP devices on LANs and routed subnetworks, via frame relay or X.25. An FRMcan also be configured to act as a gateway, forwarding IP packets it receives.IP support includes:l RIP versions 1 & 2 (as well as a V1-compatible V2)l ICMPl ARP, Inverse ARP, Proxy ARPl Standard NDIS interfaces for Ethernet, Token Ring, and 802.3 LANsl RFC 1490 frame relay and RFC 1356 X.25 interfaces for WANsl Pingl Configuration of fixed routesIP AddressingIP devices are identified by IP addresses. An IP address is 32 bits, divided into anetwork identifier followed by a node (host) identifier. This allows the Internet Pro-tocol to identify each physical network and each node on each physical network. IPaddresses are generally shown in dotted decimal notation, which means that each octetis represented by a decimal number, and octets are separated by dots, asin: 130.6.52.245 .IP networks are divided into classes, with this addressing scheme:l Class A allows up to 127 network numbers and several million node numbers:Bit 0 is 0, bits 1–7 are the network identifier, and bits 8–31 are the node iden-tifier. In dotted decimal notation, the range of Class A addresses is 1.0.0.0–127.255.255.255 .The valid range in FRM configuration is 1.0.0.0–126.255.255.255.NetworkNode
