Title: Protocol Complications with the IP Network Address Translator
Author(s): M. Holdrege, P. Srisuresh.
Status: INFORMATIONAL
Date: Jan 2001
Length: 48662
Many internet applications can be adversely affected when end nodes are not in the same address realm and seek the assistance of an IP Network Address Translator (NAT) enroute to bridge the realms. The NAT device alone cannot provide the necessary application/protocol transparency in all cases and seeks the assistance of Application Level Gateways (ALGs) where possible, to provide transparency. The purpose of this document is to identify the protocols and applications that break with NAT enroute. The document also attempts to identify any known workarounds. It is not possible to capture all applications that break with NAT in a single document. This document attempts to capture as much information as possible, but is by no means a comprehensive coverage. We hope the coverage provides sufficient clues for applications not covered.
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