Ftp Alg. 防火墙FTP非标准端口配置 山石网科知识库 Thus if you see a router primarily as a device to provide functionality it makes sense to have these options enabled by default. ALG - It is recommended to enable Application Layer Gateway (ALG) because ALG allows customized Network Address Translation (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, TFTP, H323 etc
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ALGs supports the applications such as Transfer Protocol (FTP) and various IP protocols that use the application layer payload to communicate the dynamic Transmission Control Protocol (TCP) or User Datagram Protocol (UDP. (This includes automagic port forwarding when NAT is in use.)
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An Application Layer Gateway (ALG) enables the gateway to parse application layer payloads and take decisions whether to allow or deny traffic to the application server Such as your Internal IP Address and Protocol (select Both), and then click OK to activate the rule. You can transfer files using the FTP protocol by configuring an LSN pool, configuring an FTP profile, and then assigning the LSN pool and FTP profile to a virtual server..
Everything you never knew about NATs and wish you hadn't asked. For setting up the second FTP server, please repeat Step 2 and then select FTP_ALG in the quick select list and the system will input the default port 2021 in the External Port field An Application Layer Gateway (ALG) enables the gateway to parse application layer payloads and take decisions whether to allow or deny traffic to the application server
FTP主动模式和被动模式（3）NAT对FTP的影响 NAT ALG 向往自由的独行者 博客园. File Transfer Protocol is a widely and commonly used method of exchanging files over IP networks ALG - It is recommended to enable Application Layer Gateway (ALG) because ALG allows customized Network Address Translation (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, TFTP, H323 etc