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Iptables Limits Connections Per IP

How do I restrict the number of connections used by a single IP address to my server for port 80 and 25 using iptables?
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Squid Proxy Hide System’s Real IP Address

My squid proxy server is displaying system's real IP address. I've a corporate password protected squid proxy server located at My clients works from home or offices via A/DSL / cable connections. Squid should hide all system's IP address, but it is forwarding and displaying the system's IP address. How do I configure squid to hide client's real IP address?
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PHP: Determine or Retrieve Visitor’s IP Address Using PHP Script

How do I determine or retrieve visitor's IP address using PHP server side programming under Unix/Windows operating systems?
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