Solved

Loopback interface for security and testing

Posted on 2004-10-05
3
211 Views
Last Modified: 2008-03-06
I have perm router that I want to setup interface loopback0 command on.  If my internal is on 10.0.0.0/24 and my real ip's are 63.x.x.x can i setup my loopback interface to 172.16.x.x ?

What are the benefits ?
0
Comment
Question by:cogit
3 Comments
 
LVL 11

Expert Comment

by:PennGwyn
ID: 12232083
Yes, you can.

The main benefit is that you can swap around what networks/addresses are connected at this router, and still have a consistent address which identifies the device.

0
 

Author Comment

by:cogit
ID: 12232212
Its a 1720 with one S0 and 1 E0
0
 
LVL 43

Accepted Solution

by:
JFrederick29 earned 500 total points
ID: 12236418
The benefit is that the loopback interface never goes down.  The true benefit of a loopback address comes into play when running routing protocols like OSPF for specifying the OSPF router ID.  It's also crucial when you are running iBGP and have mutliple paths between iBGP peers.  Loopback interfaces can also be setup in a LAB environment to simulate connected networks that don't actually exist.

You can assign the loopback interface whichever address you like, remember to treat it like any other destination network, if you want to reach the loopback address from another router, you will need to setup static routes or redistribute it into your routing protocol.  If you don't have a specific need to use a loopback interface, don't bother setting one up.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

We've been using the Cisco/Linksys RV042 for years as: - an internet Gateway - a site-to-site VPN device - a leased line site-to-site subnet-to-subnet interface (And, here I'm assuming that any RV0xx behaves the same way as an RV042.  So that's …
I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

831 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question