Such applications include the File Transfer Protocol (FTP) and various IP telephony protocols. Although there are other ScreenOS features, such as deep inspection, in which the gateway inspects traffic at the application layer, ALGs are typically employed to support applications that use the application layer payload to communicate the dynamic Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) ports on which the applications open data connections. An application layer gateway (ALG) is a feature on ScreenOS gateways that enables the gateway to parse application layer payloads and take decisions on them.
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