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Introduction
IP Addressing
The IP functions in the FRM support dynamic routing of IP (internet protocol) traffic
among IP devices on LANs and routed subnetworks, via frame relay or X.25. An FRM
can also be configured to act as a gateway, forwarding IP packets it receives.
IP support includes:
RIP versions 1 & 2 (as well as a V1-compatible V2)
ICMP
ARP, Inverse ARP, Proxy ARP
Standard NDIS interfaces for Ethernet, Token Ring, and 802.3 LANs
RFC 1490 frame relay and RFC 1356 X.25 interfaces for WANs
Ping
Configuration of fixed routes
IP devices are identified by IP addresses. An IP address is 32 bits, divided into a
network 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. IP
addresses are generally shown in dotted decimal notation, which means that each octet
is represented by a decimal number, and octets are separated by dots, as
in:
.
130.6.52.245
IP networks are divided into classes, with this addressing scheme:
Class A allows up to 127 network numbers and several million node numbers:
Bit 0 is
, bits 1–7 are the network identifier, and bits 8–31 are the node iden-
0
tifier. In dotted decimal notation, the range of Class A addresses is
.
127.255.255.255
Network
The valid range in FRM configuration is
Chapter 13
Configuring IP
1.0.0.0–
Node
1.0.0.0–126.255.255.255
.
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