Disabling external access to the DD-WRT WebGui

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So, playing with DynDNS and DD-WRT I worryingly observed that even if I set

Administration->Management->Remote Access->Web GUI Management

to off I can still access my router’s management WebGui via the external address. That seemed wrong, I was about to set firewall rules to block this unitl I tried from my phone using 3G. The WebGui was inaccessible.

The WAN WebGui still works from the INSIDE! But don’t worry it won’t work from outside your network.