Chapter 11Configuring IPThe IP functions in the Netlink FRX4000, FRX6000, and Frame Relay Modulesupport routing of IP (internet protocol) traffic among IP devices on LANs and routedsubnetworks, via frame relay or X.25. Routing can be dynamic (RIP versions 1 and 2are supported), and static routes can be configured.An FRX/FRM can also be configured to act as a gateway, forwarding IP packets itreceives.IP functionality also allows support of an SNMP agent in an FRX/FRM. (SNMP con-figuration is described in Chapter 14.)IP AddressingIP devices are identified by IP addresses. An IP address is 32 bits, divided into anetwork identifier followed by a host identifier. IP networks are divided into classes,with this addressing scheme:l For Class A networks, bit 0 is 0, bits 1–7 are the network identifier, and bits 8–31 are the host identifier.l For Class B networks, bits 0–1 are 10, bits 2–15 are the network identifier, andbits 16–31 are the host identifier.l For Class C networks, bits 0–2 are 110, bits 3–23 are the network identifier, andbits 24–31 are the host identifier.If the host identifier is all zeroes, the overall 32-bit IP address refers specifically to thenetwork identified by the network identifier. If the host identifier is all ones, the 32-bit address refers to all hosts attached to the network. (This is the IP broadcast addressfor that network.) If the entire 32 bits are ones, the address refers to all hosts on thelocal network.IP addresses are generally shown with each octet represented by a decimal number,and with octets separated by dots, as in: 130.6.52.245
