From: Lupi, Guy (Guy.Lupi@eurekaggn.com)
Date: Mon Sep 02 2002 - 16:46:54 GMT-3
On the router that needs to ping the other router's loopback address, put a
secondary IP address on the serial interface in the same network as the
other router's loopback address. It will forward ICMP on the serial
interface for any IP address within that network other than its own, with a
source address of the primary interface. Example below:
2511# sh run
interface Loopback0
ip address 192.168.147.1 255.255.255.0
!
interface Serial0
ip address 10.10.222.1 255.255.255.252
no fair-queue
!
router ospf 100
log-adjacency-changes
passive-interface default
no passive-interface Serial0
network 10.10.222.0 0.0.0.3 area 0
!
access-list 188 permit icmp any any
2511#sh ip os neigh
Neighbor ID Pri State Dead Time Address Interface
10.10.222.2 1 FULL/ - 00:00:39 10.10.222.2 Serial0
2511#
Router#
interface Serial1
ip address 192.168.147.2 255.255.255.0 secondary
ip address 10.10.222.2 255.255.255.252
clockrate 1300000
!
router ospf 100
log-adjacency-changes
passive-interface default
no passive-interface Serial1
network 10.10.222.0 0.0.0.3 area 0
Router#sh ip os neigh
Neighbor ID Pri State Dead Time Address Interface
192.168.147.1 1 FULL/ - 00:00:38 10.10.222.1 Serial1
Router#ping 192.168.147.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.147.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/24/28 ms
Router#
2511#debug ip packet detail 188
2w4d: IP: s=10.10.222.2 (Serial0), d=192.168.147.1, len 100, rcvd 4
2w4d: ICMP type=8, code=0
2w4d: IP: s=192.168.147.1 (local), d=10.10.222.2 (Serial0), len 100, sending
2w4d: ICMP type=0, code=0
2w4d: IP: s=10.10.222.2 (Serial0), d=192.168.147.1, len 100, rcvd 4
2w4d: ICMP type=8, code=0
2w4d: IP: s=192.168.147.1 (local), d=10.10.222.2 (Serial0), len 100, sending
2w4d: ICMP type=0, code=0
2w4d: IP: s=10.10.222.2 (Serial0), d=192.168.147.1, len 100, rcvd 4
2w4d: ICMP type=8, code=0
2w4d: IP: s=192.168.147.1 (local), d=10.10.222.2 (Serial0), len 100, sending
2w4d: ICMP type=0, code=0
2w4d: IP: s=10.10.222.2 (Serial0), d=192.168.147.1, len 100, rcvd 4
2w4d: ICMP type=8, code=0
2w4d: IP: s=192.168.147.1 (local), d=10.10.222.2 (Serial0), len 100, sending
2w4d: ICMP type=0, code=0
2w4d: IP: s=10.10.222.2 (Serial0), d=192.168.147.1, len 100, rcvd 4
2w4d: ICMP type=8, code=0
2w4d: IP: s=192.168.147.1 (local), d=10.10.222.2 (Serial0), len 100, sending
2w4d: ICMP type=0, code=0
2511#
-----Original Message-----
From: Casey, Paul (6822) [mailto:Paul.Casey@o2.com]
Sent: Monday, September 02, 2002 3:10 PM
To: 'ccielab@groupstudy.com'
Subject: Help needed
This is a lab i am working on.
2 routers back to back. Running ospf between then on there serial interfaces
only. 1 of the routers has a loopback address, which is not running ospf.
The object is to be able to ping this loopback address from the other
router... No static, default routes..allowed. The question also states that
NO routing protocol may advertise this loopback address in any way...
Anyone got any idea's how to achieve this..??? I was thinking about some
kind of tunneling..!!
If it is tunneling, could someone provide an example of this
Any help appreciated
Kind regards
Paul.
--------------------------
Sent from my BlackBerry Wireless Handheld
****************************************************************************
************
This E-mail is from O2. The E-mail and any files
transmitted with it are confidential and may also be privileged and intended
solely for the use of the individual or entity to whom they are addressed.
Any unauthorised direct or indirect dissemination, distribution or copying
of this message and any attachments is strictly prohibited. If you have
received the E-mail in error please notify postmaster@O2.com or
telephone ++ 353 1 6095000.
****************************************************************************
*************
This archive was generated by hypermail 2.1.4 : Mon Oct 07 2002 - 07:43:41 GMT-3