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Internal subnets restricted to specific external interfaces

I have a site where there are 2 internal subnets. Each subnet needs to use a specific external interface. From the firewall I can traceroute to the Internet over either interface, but from the network, I can access the Internet only over the original External Interface. When connected to the 2nd subnet and using the second interface for the gateway, I am going nowhere.


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  • PS: So my interfaces are like this. (Numbers are arbitrary)
    eth 0 internal subnet 192.168.12.0
    eth 1 external IP address with external Gateway
    eth 2 192.168.0.2 address with default gateway of 192.168.0.1 (The DSL modem)
    eth 3 internal subnet of 192.168.10.0
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  • PS: So my interfaces are like this. (Numbers are arbitrary)
    eth 0 internal subnet 192.168.12.0
    eth 1 external IP address with external Gateway
    eth 2 192.168.0.2 address with default gateway of 192.168.0.1 (The DSL modem)
    eth 3 internal subnet of 192.168.10.0
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