Lucent Technologies Release 8.2 manual Route Type host

IP Addressing 1 Networking Overview

IP Routing Screen The following diagram shows the IP Routing screen.

display ip-route 1	Page 1 of 1
	IP ROUTING

Route Number: 1

Destination Node: clan-a2_ ___

Gateway: router-1

C-LAN Board: 1b01

Metric: 0

Route Type: host

To set up an IP route, enter the node names for the destination and the gateway, and enter the slot location of the C-LAN on the local switch. The destination and gateway node names and their associated IP addresses must be specified on the Node Names screen.

The Route Type is a display-only field that appears on the screen for the display, list, and change ip-route commands. This field indicates whether the route is a host or network route. It is a host route if the destination address (associated with the Destination Node on the Node Names screen) is the address of a single host, or node. It is a network route if the destination address is the address of a network, not a single node.

An IP address for a network has the network ID in the network portion and 0 in the host portion. For example, 192.168.1.0 is the network address for the 192.168.1 network.

When a network is subnetted, and you want to set up a network IP route to a subnetwork, the IP address of the subnetwork is the first address in that subnetwork, which has all 0’s for the host portion of the address. For example, the subnet mask formed by using 2 bits of the host portion of a Class C address is 255.255.255.192 (1100000 = 192). For the 192.168.1 network, this subnet mask creates 2 usable subnetworks whose IP addresses are 192.168.1.64 (0100000 = 64) and 192.168.1.128 (1000000 = 128), with 62 usable host addresses in each subnetwork.

If you wanted the local C-LAN node to be able to communicate with the nodes on the 192.168.1.64 subnetwork and not with others, you could do the following:

1Leave blank the Gateway Address field on the IP Interfaces screen.

2Enter a node name — for example, “subnet-1” — and the IP address, 192.168.1.64, on the Node Names screen.

3Set up an IP route with “subnet-1” in the Destination Node field.

See the description of the subnet mask in Subnetting (page 16) for more information on subnet addresses. See IP Routing (page 251) in Appendix A for a description of the Metric field.

		Administration for Network Connectivity
24	CID: 77730	555-233-504 — Issue 1 — April 2000