Scenarios for enabling the NAT ALG function on the USG2000 and USG5000

If a device on which the NAT is enabled needs to forward multichannel protocol packets (such as FTP), you must enable the NAT ALG function. Because these protocols negotiate temporary port numbers during the communications to transmit packets, the NAT ALG function can automatically detect the IP address and port information in the negotiation packets, so that these protocols can be correctly converted.

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