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Network Traffic Routing

By ehoffman ·
Here is my scenario:

Development Server, with IP address and gateway pointing to a firewall and backup DSL line.

We would like to add another IP address, and have the gateway point to another firewall tied to a T-1 line to support a few sites that need a little more throughput.

Added the IP address and gateway to the existing NIC; did not seem to help. Is the answer I have to have two NICS...can't shortcut it?

Traffic from the T-1 seems to make it to the box, but nothing happens, so I assume it gets shuttled to the original DSL gateway?

I feel I am missing a fundamental issue, like I shouldn't even need to worry about the gateways, etc. Or, I simply needs two NICs, no shortcuts possible.

Firewalls are configured with one to one NAT, and access rules are okay.

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by georgeou In reply to Network Traffic Routing

You cannot have 2 gateways on any computer. The "default gateway" by definition is exclusive. You can use a custom routing table for different destinations (traffic sources) for your server. You will need to be able to identify where the requests are coming from and add their routes to the development server.

Then you'll need the DSL router and the T1 router reachable on one NIC or you can have them directly reachable via two NICs but the path they take must be different. You'll then point your generic routes to the DSL router or the router that eventually leads to it and you point your "special" routes to the T1 router or the router that leads to it.

There are other ways you can do this with a single router with a DSL and T1 connection and you won't need to touch custom routing on the server. This is a bit more complex though and you'll need to know how to do policy based routing on a Cisco or some other router.

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by georgeou In reply to

I can also give you the router configuration you need to do for a Cisco router if:

* You have a single Cisco gateway/router that had the DSL and T1 connection in the same device.

* Your default gateway or any router between the server and the DSL and T1 router is a Cisco router that uses differt routes to get to DSL and T1. Some of the more advanced Layer 3 switches also support Policy Based Routing.

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by ehoffman In reply to

Not quite unacceptable, but have a question and not sure how else to do it. To follow up, I have figured out that two companies on this network really need to be split. DHCP for each group really needs to be enabled. So, the folks on the T1 side need DHCP, folks on the DSL side need it...but want to in the end let the still access servers on other segments. Sonicwall firewalls/routers on the T1 and DSL. So, would I make 10.0.0.x on sub 255.255.255.0 on the one side, and this is where I a fuzzy. a different subnet and internal IP addresses...can I have one NIC addressed on the .0 subnet and one NIC on the different subnet, and I can get all I dream of here?

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