dhclient and cable modem

[Zoran Kolic]

Dear list!
For a month or two I will be connected
to cable net. So, I tried it on another
location and... did not work. Laptop
has 6.0 and "rl". I used empty dhclent.
conf and then populated it with every
option I found on the net. Firewall
got no traffic, the packet was not leaving
the box. When at home, I learned that
I had not checked ethernet possibilities.
Ifconfig shows 10tx, auto mode and no ip
address.
In this moment I'm sure that the system
works correct and that I misconfigured
something. But what? How should look
conf file? Or to add some hints to rl
on the command line.
Provider offers dhcp and no static address.
Rl sands discovery and receives no offer.
What i'm doing wrong?
Best regards

                    Zoran