The "ip unnumbered" configuration command allows you to enable IP processing
on a serial interface without assigning it an explicit IP address. This is a
good way to conserve network and address space.
Consider a class B network subnetted with eight bits. Every interface in the
network including the serial lines will require a subnet. Since each serial
line has only two nodes, this wastes 252 addresses on each serial line.
Here's where IP unnumbered comes in handy. For any point-to-point serial
link or point-to-point sub- interface, IP unnumbered lets you borrow the
address of some LAN interface to use as a source address for routing updates
and packets from that interface. No network is wasted, and precious address
space is conserved.
IP Unnumbered is used for point-to-point links.
Command Syntax
---------------
interface Ethernet0
ip address 171.68.178.196 255.255.255.192
interface Serial1 ip unnumbered Ethernet0
router igrp 10 network 171.68.0.0
>Hi fellows
>could anybody explain to me what "ip unnumbered" command is, and how it is
>used?
>thanks in advance.
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