DHCP woes (still)

Okay I've gone *deep* into study on DHCP (even set up a DHCP server on
my home network and did some tests with it). But I **still** can't
connect to cox via DHCP. I've got the hostname set everywhere I can
think of I've tried dhcpcd -h cx#######-d and pump -h cx######-d. I'm
not able to get an IP address either way. I'm beginning to think one of
my ipchain rules must be stoping it. Can anyone think of one that would?
Also does anyone know of a script to convert ipchain rules to iptable
rules?

Carl P.