IP Relay Server is a program that mapping the incoming connections to a predetermined IP address at real time. This allows Guest to connect a Host PC from the outside without special configurations (Private/Public, Router/Firewall/Proxy Network). IP Relay Server is a software package that can be configured to provide Network Address Translation (NAT), Port Address Translation (PAT), or Proxy/Firewall services. Follow the link and free download IP Relay Server now.