Belkin routers support one IPSEC (Internet Protocol Security) tunnel. No configuration is required on the router, provided your VPN server is compatible with Network Address Translation (NAT).
There are several configurable options on a VPN server. The common options in respect to NAT are, connect via NAT Transparency, use NAT-Traversal and allow NAT connections.
Note: These options may differ depending on the manufacture of the VPN server. There are no configurable options you can manipulate on the router to establish a connection. Your administrator ultimately has the ability to allow or deny any user they see fit. Consult your network administrator for further assistance.