[negge]

If you're inside your LAN and go to your external address you will end up at the router. You shouldn't disable web access from the LAN side because otherwise you will lock yourself out from the router. If this happens when you're outside your own network then you should indeed disable external access to the web interface.

You can also change the port Apache listens on from the default 80 to e.g. 8080, then change the port forwarding accordingly.