Windows 2011 SBS - Clients cannot connect to the Internet

I am setting up a new server running Windows 2011 SBS.

There are three NICs:

1. NIC 1: connects to a router's LAN port, FIX IP: 192.168.1.2/255.255.255.0/192.168.1.1 DNS 192.168.1.2
2. NIC 2: connects to another router's LAN's port.  Fix IP: 192.168.1.3/255.255.255.0/192.168.1.1 DNS 192.168.1.2
3. NIC 3: connects to a network switch.  Fix IP: 10.0.0.1/255.255.255.0/(no set on the gateway) DNS 10.0.0.1/192.168.1.2)
4. The router IP: 192.168.1.1.

Configurated server: DHCP (binding on NIC 2 and NIC 3), DNS, and RRAS (NIC 1 as Internet connection, NIC 2 as VPN, and NIC 3 as local area network)

The server can get on the internet fine.  The workstations can join connect to the server too, the http://connect/ and http:// companyweb / are all working.  The problem is that the workstations cannot get on the internet.  What should I do fix this problem?