win 2003 server how to share internet connection

[peace]

hi can anyone help me here please i have a a adsl router connect to a proxy server
my modem router ip is 10.15.21.149
i use dhcp server & dns server on my main pc where the router is connected
i can surf on the main pc
i have two nic card one is static ip 10.15.21.150 & the second is dhcp enable
i connect the router on the second nic card where dhcp is enable
i have switch also dlink 24 port can any one help me to get this work
how can i do this thanks

[lucky_chouhan]

just connect your main pc and other pc go to the internet explorer tool ip address here is option gateway type the gateway address in your surfing pc ip address.