Revision as of 01:42, 15 January 2026

Application Level Gateway (ALG)

Application Level Gateways (ALGs) are application specific translation agents that allow an application (like VOIP) on a host in one address realm to connect to its counterpart running on a host in different realm transparently. An ALG may interact with NAT to set up state, use NAT state information, modify application specific payload and perform whatever else is necessary to get the application running across disparate address realms.

Source: NIST SP 800-58 | Category:

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