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Your system should send replies automatically to the nearest known route back to the computer that sent the request, which in most cases will be router that passed on the request and the card that received the request, unless there is a route statement that overrides it.

Only if he is running a routing protocol. Without one or some manual routing statements, everything goes out the default route.

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You can only have one "default" gateway, which is where packets go when there is no other known route. Routes are defined by destination, not be where the request came from. So, if you always want to reply to particular networks through a particular router, you can do that with route statements.

Agreed.

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Your system will add to the routes you define dynamically based on other networks and hosts it learns about while it is running.

Again, only if he's running a routing daemon like gated, or whatever the linux equivalent is (zebra??) Greg Freemyer Internet Engineer Deployment and Integration Specialist Compaq ASE - Tru64 Compaq Master ASE - SAN Architect The Norcross Group www.NorcrossGroup.com