Can I set up a LAN with a router that is not connected any modem?

[LeoLoon]

I would like to set up a LAN connection among my friends so that we can play some games together. I was thinking of just using a router to set up this "portable network" for LAN games so that we can play anywhere we like. Will connecting all of the devices to the turned on router let us connect our devices or do I need some other stuffs to make something like that happen?

 

[kanewolf]

Some routers will complain, but most will allow you to use them as a simple DHCP server and switch.

 

[The Paladin]

sure you can, just let the router complain about lack of internet connectivity and it will be quiet but it will do the rest of its expected functions