Hi sdayman - thanks for the quick reply.
To access the NAs (rather than the router) i need to append a port (:1111 for example) to the IP.
Unfortunately DH gives me the error message:
‘Invalid: IP address can only have numbers!’
any ideas how i can get around this?
Update: ok - so i can just use my fixed ip and append :port to the URL. But is there any way I can get around having to use the port? Can I set up subdomains to point to various ports?