Cisco ASA5510 and Two DSL Connections

[drebo]

So I've got a client who has two DSL connections and he wants me to direct traffic between the two of them. All normal web traffic should go through the first and all traffic to and from his email server should go through the second. He's only got an ASA5510 right now.

I already know that an ASA can NAT to multiple subnets, however I've only ever done this when both subnets came through the same router and T1. In our case here, the customer has two Netopia routers, and as far as I know, an ASA 5510 doesn't support route maps.

So, my idea is to throw a third Cisco router with 3 FE ports into the mix between the Netopias and the ASA 5510. The way I believe I should configure this router is to use "ip unnumbered" on the port facing the ASA5510 and use a route map based on source IP address to direct which DSL circuit the data goes out.

To Cisco people, does this sound feasible or is there an easier way to do it that I'm missing with just the ASA?

 

[skyking]

The simple solution seems to be a second network adapter, and a few configuration changes on that email server.

 

[drebo]

Yes, I could do that. And if I wanted to be even cheaper and simpler, I could just use another NAT router and have a second gateway on my internal network. However, neither of those solutions is elegant or optimal.

I need all inbound and outbound traffic to pass through the ASA. Inbound for obvious reasons, and outbound because I have future need of site-to-site VPN connectivity.