Host name question

[Bill Schmitt (SW)]

I know I've seen the answer to this question somewhere here, but I can't 
seem to find it. I'm running FBSD 4.9 on a machine which is connected to 
a router (Netgear) that provides DHCP services. The FBSD box gets the IP 
correctly (assigned based on the MAC address), but the router never sees 
it by name. I have the name of the machine in the hosts file and 
rc.conf, but the router never gets the name back. Can anyone help?