Network card connection with proxy and 3G modem

[onetx]

Hello everyone,

I have a routing problem with my computer that I hope you can help me with.
My computer is connected to an internal network via an Ethernet card and connects to the internet via a proxy configured in the system (http://internetproxyserver/).

The problem is that this computer must connect to an external server to the internal network with a specific IP (5.56.62.87). To connect to this IP we use a 3G Modem, activating the modem connection and deactivating the system proxy configuration. This causes the computer to temporarily disconnect from the internal network and all traffic to go out through the 3G Modem.

I need to keep both network connections active simultaneously, where internal network traffic with the 10.0.0.0 network address is routed through the wired network card and using the proxy, and all traffic to the specific server IP (5.56.62.87) goes out through the 3G modem without using the proxy.

I think the ROUTE command could set static routes, but I would have to run it after activating the 3G modem connection, but I don't know how to discriminate the use of the proxy according to the destination IP.

Can you help me?

Thanks in advance.