Using 2 internet connections - setting MT4 to use only one of them?

Hey all,

I hope this is the right place to ask this.

I use 2 Internet connections : 1 for work (can't connect to my forex.com server through Metatrader 4 using this, work security bleh - this is the default connection)
1 personal Internet-connection using usb modem.

My question is, can I tell metatrader to use the usb modem (my second connection) and not the default one? And if yes, how can I do this?

Thanks,
Diez