Sbs 2003 share nics

Hi, Ihave a sbs 2003 with 2 nics , nic #1 is for my primary lan and internet Subnet 192.168.1.1 to 1.X and my second nics is on another subnet 172.27.0.X is for a machine on our plan, i put a router to my #2 nics 172.27.0.1 , from the server no problem i can access to the machine i can ping the both router from the server, but i Can’t ping the second router (172.27.0.1) from other computer on the lan. can you help me to share this nic|2 over my lan, this server manage vpn connection.

excuse my english is not my first language

thanks for help