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When the firewall is enabled systems connected by WiFi are blocked from the LAN. This problem has been reported before in various guises but I've not seen such a basic bug as this.

I have a TD-W9980 connecting to the internet via VDSL. I have the firewall enabled. The TD-W9980 has its default IP of 192.168.1.1.
All systems on the LAN work as expected and can use the internet etc. except for systems connected by the TD-W9980's WiFi can't access the LAN.

For example I have a laptop connected to the TD9980's 2.4GHz WiFi, it has IP 192.168.1.106. It can access the internet without problems and it can access the TD9980 but it can't connect to any other system on the LAN.

If I disable the firewall then the laptop *can* access other systems on the LAN but this is unacceptable as the main reason I bought the TD-W9980 was to use the firewall.

Does anyone have a workaround for this bug? I've tried adding various rules to the firewall to enable access but I'm only guessing at what might work as the firewall doesn't explicitly have any LAN to LAN rules.