From: Scott Morris (swm@emanon.com)
Date: Thu Aug 24 2006 - 21:23:34 ART
Use the 'source' part of ping!
interface FastEthernet0/0
ip address 10.10.10.10 255.255.255.0 secondary
ip address 10.9.9.9 255.255.255.0 secondary
ip address 11.11.11.11 255.255.255.255
!
interface FastEthernet0/1
R1(config-if)#end
R1#ping
*Aug 25 00:15:16.769: %SYS-5-CONFIG_I: Configured from console by console
R1#ping 20.20.20.20 source ?
A.B.C.D Source address
Async Async interface
BVI Bridge-Group Virtual Interface
CDMA-Ix CDMA Ix interface
CTunnel CTunnel interface
Dialer Dialer interface
FastEthernet FastEthernet IEEE 802.3
Lex Lex interface
Loopback Loopback interface
MFR Multilink Frame Relay bundle interface
Multilink Multilink-group interface
Null Null interface
Port-channel Ethernet Channel of interfaces
Tunnel Tunnel interface
Vif PGM Multicast Host interface
Virtual-PPP Virtual PPP interface
Virtual-Template Virtual Template interface
Virtual-TokenRing Virtual TokenRing
XTagATM Extended Tag ATM interface
R1#ping 20.20.20.20 source 10.10.10.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.20, timeout is 2 seconds:
Packet sent with a source address of 10.10.10.10
!!!!!
Success rate is 100 percent (5/5)
R1#
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPExpert VP - Curriculum Development
IPExpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of N
Mohamed
Sent: Thursday, August 24, 2006 7:38 PM
To: ccielab@groupstudy.com
Subject: Basic routing question
Hi All
I have a small problem but it is big for me,.
Router A-------------Router B---------------Router C----------Router D
Router A can ping Router D
Router B cant ping Router D
Reason, Router B has many secondary IP and the link between Router B and
Router C is one of the secondary IPs.The primary IP is a private one,so
Router C or Router D dont knows this and drops the packet.
My question is how can we make the router to choose the secondary IP
depending up on the destination ?
Thanks
Mohamed.
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