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Conclusion
Port forwarding is a very useful method for connecting to machines on an internal network guarded by a firewall. It allows you to put mail servers, FTP servers, web servers, or Telnet hosts behind a firewall, where they can enjoy many of its protections. However, it also opens some security holes, which demand stricter attention to your security procedures and log files. It's easy to configure, but should be used with caution.
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