Application Level Gateway (ALG)

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Abbreviation(s) and Synonym(s):

ALG

NIST SP 800-77, NIST SP 800-77 Rev. 1

Definition(s):

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(s):
NIST SP 800-58

Glossary Comments

Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.

Comments about the glossary's presentation and functionality should be sent to secglossary@nist.gov.

See NISTIR 7298 Rev. 3 for additional details.

Information Technology Laboratory

Computer Security Resource Center

Computer Security Resource Center

Application Level Gateway (ALG)

Glossary Comments