I have the same type of setup (mainly for testing different registry
keys for network connections).
In order to use the other Internet connection, you will need to setup
direct routes on your TS server. This will be a big problem if the
users coming in have dynamic IP addresses.
If they have static IP addresses then you could add static routes to TS.
You will also need to know if TS sees the users Internal IP address or
their External IP address.
Example- 2nd Internet Gateway = 192.168.2.1, Client IP = 10.2.2.43
route add 10.2.2.0 mask 255.255.255.0 gw 192.168.2.1 -p
That will then allow your client to come in and out on the 2nd NIC.
If no one is coming in on your 1st NIC, then you could also remove the
default gateway from the 1st NIC and enter the default gateway on the