TP-Link TD854W User Manual page 78

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 WAN Setting: The setting of WAN side, it can be "Interface" or "IP Address".
If it is "Interface", you should specify a WAN interface for this ACL entry.
If the WAN setting is "IP Address", you should specify the IP address of the host on WAN side.

Service Allowed: You can specify the service and opened port for this service on WAN side.
The host access the specified port can obtain the specified service the router provides.
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Figure 4-49
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