Firewall in TD-W9980 blocks DHCP requests - how to add rule to allow DHCP?

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Firewall in TD-W9980 blocks DHCP requests - how to add rule to allow DHCP?
Firewall in TD-W9980 blocks DHCP requests - how to add rule to allow DHCP?
2017-05-07 22:23:39
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ISP :

I have a TD-W9980 with its DHCP server disabled (because I have a dedicated DHCP and DNS server) and with its firewall enabled.
The firewall blocks DHCP requests from WiFi clients reaching the DHCP server.

If I disable the firewall then the DHCP works as expected so I am pretty sure it is the firewall blocking the requests.

Can anyone suggest how I can set up the firewall to allow DHCP requests through to the (wired) LAN?
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