OK so I am setting up internet access for my
step-father here in Bangkok; no DSL is available
but the ISP also offers unlimited access for about
$13 per month if we can access by WiFi.   I verified
using my LMC350 card and norn antenna ("cantenna")
that I have signal and can log on.   The server presents
a portal page to a browser when you connect so you
can input your username and password.

Problem is the signal is too weak inside the house
so I have to use  the horn on the roof connected to
Wireless Client hardware and run an ethernet cable
into the house.  (Now using Linksys G-570S but later
if I can get it to work will switch to the WRT54GL.)

However I cannot log on with the PC connected via
the ethernet port to the Wireless Client, I am guessing
because it asks for an IP address once the Client
connects to the ISP's Wifi access point.    I suspect
the ISP has to authenticate on the issued IP
address and won't give me another one.

Any ideas for a fix or workaround?   All I can think of is to set up an old computer and log
on with that, then use Internet Connection Sharing (two lan cards in same machine).
Sounds clunky to me.  Something better?