Specific protocols that embed IP address information within the payload require support of an ALG. The protocols that do not carry the source and destination IP addresses include HTTP, TFTP, telnet, archie, finger, Network Time Protocol (NTP), Network File System (NFS), and remote copy (rcp). NAT performs translation services on any TCP/UDP traffic that does not carry source and destination IP addresses in the application data stream. This module also provides information about the protocols that use ALG for IP header translation. This module describes the basic tasks to configure an application-level gateway (ALG) with Network Address Translation (NAT). Using Application-Level Gateways with NAT Feature Information for Using Application-Level Gateways with NAT.Additional References for Using Application-Level Gateways with NAT.Example: Specifying a port for NAT Translation.Example: Enabling SPI Matching on Endpoints.Example: Disabling SPI Matching on the NAT Device or Changing the Default Port.Example: Configuring IPsec ESP Through NAT.Configuration Examples for Using Application-Level Gateways with NAT.Disabling SPI Matching on the NAT Device or Changing the Default Port.How to Configure Application-Level Gateways with NAT.NAT ALG-SIP Multiple Media Line Support.NAT Support for SIP-Voice and Multimedia over IP Networks.NAT Support of Skinny Client Control Protocol.NAT Support for Application-Level Gateways.Information About Configuring Application-Level Gateways with NAT.Prerequisites for Using Application-Level Gateways with NAT.
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