Internet on solaris

Hi friends,i use BSNL broadband for my internet through a modem(a router) from ethernet port.i use a username and password to connect.Its dhcp .plz help me

please try to describe your setup a little better... where do you need dhcp? from solaris to router? which solaris release do you use? is your nic working on solaris? the more details you can give, the better...