jeongwoo,
                Simply put "ip unnumbered" allows you to use the network or
subnet address of the local LAN -interface(i.e e0, t0) as the routers
network or subnetwork address for point-to-point links.

This basically helps you conserve address space by letting you use the
already assigned ip address from you local LAN interface treating the serial
interface almost like a sub-interface if you will. This only works for
point-to-point links as I mentioned before.  An example

RouterA#
!
!
Ethernet 0
ip address 172.16.10.1 255.255.0.0
!
Serial 0
ip unnumbered(picks up the ip address of ethernet 0 - 172.16.10.1 for
routing)

HTH

Nigel

----- Original Message -----
From: jeongwoo park <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, June 06, 2000 9:55 AM
Subject: ip unnumbered


> Hi fellows
> could anybody explain to me what "ip unnumbered" command is, and how it is
> used?
> thanks in advance.
>
> ........................................................
> iWon.com       http://www.iwon.com     why wouldn't you?
> ........................................................
>
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