Edimax Technology BR-6225N - Manual (Page 124)

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3-5-2-4 ALG Settings
You can select applications that require “Application Layer Gateway”
support.
Parameters Default Description
Enable
You can enable “Application Layer
Gateway” function, and the router will
let selected application correctly pass
though the NAT gateway.
Click <Apply> at the bottom of the screen to save the configurations.
You can now configure other advance sections or start using the router.