question : iptables and squid

[Murat Ugur EMINOGLU]

Dear all,

I have a linux server and 3 ethernet card installed and squid is working 
this server.
Im using two ADSL lines. Im sharing these ADSL lines with iproute. But i 
have a problem.
ADSL1 and ADSL2 users has a same real ip address. All 80 port request 
exit the one ADSl line.
What kind of routing am i making this protocols (iptables and squid)?

thanks, regards.
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Murat Ugur EMINOGLU
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