Help with setting up Internet tv.

[wnb]

I have a samsung tv and it normally works fine with iplayer. It's network settings are setup for auto which has worked fine in the past.

I am trying to setup manually but it wants

IP Address, I don't know what it is but I assume I can put any free ip address in here?

Subnet mask I think is 255.255.255.0
Gateway, is this my router ip? If it is it's 192.168.2.1
Dns server, dunno what this is

Thanks.