SNAT (Source Network Address Translation)

The meaning of the term SNAT varies by vendor. Many vendors have proprietary definitions for SNAT:

  • source NAT is the common expansion, as the counterpart of destination NAT (DNAT)
  • stateful NAT is used by Cisco Systems
  • static NAT is used by WatchGuard
  • secure NAT is used by F5 Networks and by Microsoft

Microsoft’s Secure network address translation (SNAT) is part of Microsoft’s Internet Security and Acceleration Server and is an extension to the NAT driver built into Microsoft Windows Server. It provides connection tracking and filtering for the additional network connections needed for the FTP, ICMP, H.323, and PPTP protocols as well as the ability to configure a transparent HTTP proxy server.

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