troubleshooting Question

Cisco 2801 Router as a Default Gateway for ISP

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JustinBMak asked on
BroadbandNetworking Hardware-OtherNetwork Security
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EE Folks:

I have a fiber internet connection that goes to a Cisco ME3400 (Fiber to Copper Converter) and then my new ASA5510 (directly - asa5510 is set up in routed mode). My ASA5510 keeps getting knocked offline due to the enormous amount of TCP packets out of sync I am receiving from my ISP. I called the ISP and they said my line is basically a Layer 2 link and that there is no routing. Cisco Engineer states I need to put a router between the ASA and my first hop (the Cisco ME3400).

So I am trying to work on this, I have it configured as I was going to put the Cisco ASA in transparent mode however an engineer at Cisco has informed me that it is not recommended due to the fact I use NATing for multiple things include my web server and for my consultants remote access.

So with that being said, I need to see what the best possible solution is. I would assume as the one Cisco Eng. stated is to put up a router but I wouldn't think you would want two routers on the same network - right? It's not best practice and a section of the CCIE Security KB is that you want a router in between your ASA and your ISP. So if this is all true, how would I set up the Router to be basically a gateway like how the folks at AT&T do when you get a bonded T1 circuit?

I "think" basically I would want the Cisco Router to be a gateway router to where the ASA can have one of my 16 IPs and set the ASA's default gateway as the Cisco 2801 but not sure how that would pass over to the Cisco ME3400 because obviously I need it!

Plus I am in the process of purchasing a Cisco 2Port Fast Ethernet WIC Card because I have two ISP and I am going to set up fail over on

I'm sure there will be tons of questions so please ask away! I am eager to set this up or return the ASA and go back to Sonicwall.

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