[plug] IP Masquerade problem

[Mark]

Hi all

Have been using IP Masquerade on my dial up machine to allow a second
linux machine access to http services.
I would like to extend this but have a basic problem   with my existing
setup I still can't resolve.

My gate way or IP Masquerade machine is setup as 192.168.0.1  the other
as 192.168.0.3

My ISP uses a proxy server.  If I set up the proxy options in the client
box using IP numbers

ie 202.61.192.13  http services work. If I use the DNS equivalent it
won't proxy.omninet.net.au 

Like wise using ping ftp etc. If I ping an adress using its IP number it
works but not its named equivalent.

Is there a service I am not running or a config file I've missed. 

Mystified