PC-name in the network

[Dirk Tamme]

Hi,
I'm using Ubuntu 8.04 with GNOME. The PC connects via a Netgear DSL router to the internet. When I logon to the configurational site of my router,
there is a list of all devices with IP-address, name and MAC. For example, my printer in the network is shown with name HP...
But, for my PC only IP-address and MAC are given, the name is shown as "unknown". During the installation of Ubuntu, the PC gets a name. What should I do so that my PC communicates its name to the router?

Thanks for any help,
Dirk T.