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Application-level gateway — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Application-level_gateway
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-09T17:34:15.800Z
SHA-256 of the archived text: 3930980b74a97ec5a65bedd86c35c677b706a60fcba7378b037b709b084ab061
Stable URL of this page: https://metraipolis.com/documento/dc_d331fc331ad0

How to cite

Application-level gateway — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Application-level_gateway (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_d331fc331ad0 (Metraipolis archive dc_d331fc331ad0, sha256 3930980b74a97ec5a65bedd86c35c677b706a60fcba7378b037b709b084ab061)

BibTeX

@misc{dcd331fc331ad0,
  title = {Application-level gateway — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Application-level_gateway},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_d331fc331ad0; sha256 3930980b74a97ec5a65bedd86c35c677b706a60fcba7378b037b709b084ab061},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Application-level_gateway. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

An application-level gateway (ALG, also known as application-layer gateway, application gateway, application proxy, or application-level proxy) is a security component that augments a firewall or NAT employed in a mobile network. It allows customized NAT traversal filters to be plugged into the gateway to support address and port translation for certain application layer "control/data" protocols such as FTP, BitTorrent, SIP, RTSP, file transfer in IM applications. In order for these protocols to work through NAT or a firewall, either the application has to know about an address/port number combination that allows incoming packets, or the NAT has to monitor the control traffic and open up port mappings (firewall pinholes) dynamically as required. Legitimate application data can thus be passed through the security checks of the firewall or NAT that would have otherwise restricted the traffic for not meeting its limited filter criteria.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Application-level gateway» — https://en.wikipedia.org/wiki/Application-level_gateway
Wikidata Q2293568: «security component that augments a firewall or NAT employed in a computer network» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q2293568
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Application-level_gateway?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1314530638, consultata il 2026-11-09T17:30:50.250Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 20ef04fe8db857fd381d842247321432334bb8adcd984b5cc1ec3d12d2ba5f76