Block access to the internet for one device, but still use home network

[the-evaluator]

I.e. buy any old router, give that router no gateway, plug my TV box into that router and that router into my existing one. That way anything going via the new router (and from there into the existing one) won't have a gateway? Or would it then pick up the gateway once it gets to my existing sky router?

You could (you would need to give this additional router a static IP address), but that'll create new problems as the NAS will be on a different network to everyone else on your network. As such you won't (easily) be able to access the NAS from other devices on your network. Effectively the NAS would be isolated for the internet and everything else on your network.

 

[dubster]

ahh yeh course you're right. sounds like asus router is gonna be the only option then. (unless by luck the box static ip lets me specify a non existant gateway

 

[dubster]

This can be easily be done using asuswrt router that supports merlin firmware,
don't know if the asus stock firmware supports the MER option.

Just wanted to say a big thank you for the suggestion.

I managed to pick a 2nd hand asus router off ebay for 35 quid, just put merlin firmware on and have access to the very screen you've put above.
Gonna try hooking it up to the existing router tomorrow to give the asus router access to the internet and hopefully the tv box will be blocked from the net and the rest will work as before.