PPPoE -> DHCP : how to switch ???

[Vincent Trouilliez]

Oh dear...

My ISP is about (anytime this month, maybe as soon as tomorrow), to
increase my connection speed from 64Kbps up to 1024Kbps, for the same
price.
Great I thought. But, I just read on their site, that they have changed
the rules. Currently, I connect to my cable modem using PPPoE. But my
ISP says that when I switch speeds, I will have to connect using DHCP
instead ! Cool, "DHCP", these 4 little letters that sound mysterious and
always scared the hell out of me... now I must face them ! :-/

When I installed Ubuntu, I only had to run 'pppoeconf', enter log-in and
password and 2 seconds later internet was working. What must I change to
switch to DHCP ?
I seem to remember that when I unstalled Warty, at some point, the text
installer tried to connect to internet using DHCP. But I don't want to
re-install Ubuntu, too much work !! :o(

I seem to gather that DHCP could, somehow, connect without even asking
me for my password and log-in, sending the cable modem' MAC address to
the ISP to identify my computer instead ?
The ISP doesn't offer much support for Linux (at least they acknoledge
its existence, so it's better than nothing...), all they say is that I
must remove the PPPoE connection and install a DHCP 'client' instead.
They say that there are many clients and that a popular one is to be
found here : http://www.isc.org/dhcp

Please help me ! Please someone detail all the steps I must do to remove
my PPPoE connection and replace it with DHCP.

Thanks much in advance

Regards,

Vince, scared by DHCP, but looking forward to broadband at last ! :-)