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Accessing the Internet using a CISCO ASA 5510 - routing issues

Posted on 2006-10-19
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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 192.168.1.1 / 192.168.2.1  / 192.168.3.1.

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

The Internet proxy has an IP of 192.168.1.10 and is located in Network A.

My systems's IP is 192.168.1.15 and the gateway is 192.168.1.1 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 192.168.1.3 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 (192.168.1.3) 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.

Hiran
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Question by:cfgchiran
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Accepted Solution

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lrmoore earned 500 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 0.0.0.0 0.0.0.0 192.168.1.3

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 192.168.0.0 255.255.0.0 192.168.1.1

Done
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by:cfgchiran
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.
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