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Add the port opening, 80. You can use the WAN IP of the AXT1800 to be access on the 192.168.1.0/24.
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Please refer to this thread, to enable the WAN group on the firewall (Luci > Network > Firewall)
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Yes
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No. But you can install the third-party plugin
luci-app-ddns
to use the Cloudflare ddns service.