Accessing the Internet using a CISCO ASA 5510 - routing issues

Posted on 2006-10-19
Medium Priority
Last Modified: 2010-03-19
Hi! All.

Currently I use a Proxy server to access the Internet, with proxy settings specified on the Internet browser for each syste,

I am trying to add an ASA 5510 to use as a firewall to access the Internet, and eliminate the use of the proxy, and I am having some problems.

Here's my set up.

Three networks.

Network A: 192.168.1.X
Network B: 192.168.2.X
Network C: 192.168.3.X

Networks B & C are connected to A via P2P T1 lines. I have CISCO 1720 routers on each network with static routes to each other and I can access servers across each network from any of the three. Each of the routers are set up with IPs /  /

Internet access is also fine as long as the client has the proxy specified.

The Internet proxy has an IP of and is located in Network A.

My systems's IP is and the gateway is and I can communiate to servers on the other two networks as well as the Internet just fine.

I would like to add the ASA 5510 bearing IP address to my network and use that as my Internet connection firewall and eliminate the Proxy.

From my machine if I change the gateway to the IP of the ASA ( I can hit the Internet just fine. So the ACLs on the ASA is not an issue.

However if I change that gateway then I cannot communicate to the other two networks and I also cannot hit the Internet from the other two networks, if I remove the proxy settings from the browser.

I know I need some sort of static routing here to get the systems on the other networks to talk to the ASA.

But what confuses me is since I already have static routes set up on the CISCO routers at each of the location to communicate with each other, how do you I make the systems on networks B and C access the Internet without the Proxy?

Any help would be greatly appreciated and I will be more than happy to give 500 points for the correct answer.

Thank you.

Question by:cfgchiran
LVL 79

Accepted Solution

lrmoore earned 2000 total points
ID: 17771072
1. Don't change the gateway. Keep it pointing to the 1720 router, but do add this to the router:
  ip route

Make sure each remote site router points its default to your 1720 wan IP

2. Suggest keeping the Proxy in place. Because it caches dns and web pages, it can improve the user experience and help keep redundant traffic off your Internet to save Internet bandwidth.

3. Add a route statement to the ASA
  route inside


Author Comment

ID: 17786432
"lrmoore" - Thank you so much for your prompt response. My network actually has more subnets than I indicated, but with the information provided, I was able to configure all of the subnets and routers. Thank you.

Featured Post

The Lifecycle Approach to Managing Security Policy

Managing application connectivity and security policies can be achieved more effectively when following a framework that automates repeatable processes and ensures that the right activities are performed in the right order.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
Unable to change the program that handles the scan event from a network attached Canon/Brother printer/scanner. This means you'll always have to choose which program handles this action, e.g. ControlCenter4 (in the case of a Brother).
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

586 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