MacPro connect to Internet with Ethernet 1 and Ethernet 2

I would like to use both ethernet ports on my MacPro. However, if I connect routers to both ports, I lose my internet connection. I would like to be able to access the internet on both ports.
I would like to be able to use Safari to access the router settings. When I connect routers to both ports Safri is not able to 'see' either router, despoite my putting in the correct local IP addresses.
System preferences > Network shows that both routers are being detected properly.
Can anybody suggest a way forward?
More info available if needed.
Thank you
Peter

Your Mac will use the connection port listed at the top of the Network preference to connect to the Internet, by default.
You can get it to use both ports at once ONLY if you connect it to ONE Router (e.g., high-end Cisco) designed to use both ports at once, and then only if you turn on additional special features.
Load balancing is not available with current Mac OS X software.

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