IP masquerading

[joebosak]

I wonder if someone could help please! 

I've upgraded to sarge, and built a new kernel with lots of the networking 
options built in. 

I've tried to set up IP masquerading so I can use my Debian PC as a router 
to a [dialup] ISP.  The Debian machine has a serial modem and an ethernet 
card.  The ethernet connects OK to the other computers [Macs and Windows] - 
you can ping either way and get responses. 

Once connected to the ISP, the Debian machine can ping the IP address of its 
modem and get a response, and canload web pages.  But other machines get 
nothing when I try. 

dmesg on the Debian machine only lists: 

192.168.0.0, although the address of eth0 is 192.168.0.5
the IP address of the modem ppp0
and 0.0.0.0 with the modem IP under "gateway". 

Any idea what could be wrong? 

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