dhcp /etc/hosts problems

[Greg]

I think I'm in the right place because I'm sure enough a newbie.

I've got a cable connection with cox.net and used netcnfg to select 
dhcp.  When Gnome starts it gives a message saying the ip address didn't 
get into /etc/hosts and that I can enter it manually, but since the 
address is constantly changing this is not the answer.  When I start 
Gnome I'm connected to cox, but having an unknown host can't be good. 
 Does anyone know how to get the ip addresses into /ect/hosts automatically?

Thanks in advance

Greg Richardson
Escondido California