Re: ip unnumbered in PPP ?

Hi Butcher

The unnumbered IP command enables you to enable IP routing/processing on an
interface by assigning it an IP already in used of another interface. That
is to say, the unnumbered IP command enables you to have 2 interfaces, a
multi-access interface and a point to point interface (often a serial port)
to share the same IP address.

Interface does not have an IP address and is instructed to source traffic
from the loopback0 IP address. The router on the remote end is configured
in the same way. The problem you are facing is that router 1 and router 2
can receive ICMP traffic, but cannot respond to the ICMP Echo Rquest due to
a routing failure as the they don't know about each others loopback
addresses.

In PPP it sends the IP address of the source interface across the link. You
can see the routing table and a /32 route installed on both ends for the
corresponding looopback and thus allows the router to send ICMP Echo
Replies to it's neighbor.

Raghava Rao

On 31 July 2012 13:24, ccie.butcher <ccie.butcher_at_gmail.com> wrote:

> What is the use of ip unnumbered command especially configuring ppp
> between the devices at different subnets.
>
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Received on Tue Jul 31 2012 - 13:51:04 ART