I want to block other NAT that are behind my firewall (ex: wingate,
Microsoft ICS...), Someone know how to do it?

---Gateway-------|Client1
                 |      
                 |Client2
                 |
                 |Client3|---|Sub Client1
                             |    
                             |Sub Client2
                  

Gateway = Linux 2.4.18 + IPTABLES + NAT + Squid
Client1 and Client2 = Windows 9x
Client3 = Windows 98 SE + ICS (Internet Conection Sharing (Microsoft NAT))
Sub Clients = Windows Workstations



My intention is to block the "Sub-Client1" and any other that is not
masqueradim by my own Firewall.

I have the MAC Adress of all masqueraded clients that I would like to permit

Thank you for the attention.


Leonardo Pires



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