Using 2nd Built-In Ethernet port for internet access?

Hello,
I have a Quad-G5 running 10.4.8. In its current configuration, all its network communications, including web access, go over the active ethernet port (Built-in 1).
Does anyone know how I could use the second built-in port for internet access only? I'd like to route local traffic over the first port, but go "out" over the second.
The machine is on a corporate network, and proxy access is slowwww. I have the ability to use a direct connect to the internet, but still need to be connected locally. Any thoughts? Many thanks . . . JD

Easy. Go to System Preferences > Network > Network Port Configurations and drag the port connected to the internet to the top, so that it has priority over the port connected to your LAN. This prevents DNS time-out when loading a website, but still allows LAN traffic over the other port because that traffic is most likely going to use ARP rather than DNS. For good measure, you can add your company's domain (such as "my_company.lan") to System Preferences > Network > Internal_Ethernet > TCP/IP > Search Domains.

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