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Is it possible to enable my wireless card to connect to my NAS and not to the internet?
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To get a guest machine onto a network to access file shares but not have internet access you can:
- manually remove the default route on the client,
- configure the DHCP server to give that particular client no "routers" option, or
- put firewall rules on the router to prevent forwarding of traffic from that router.
Manually messing with client routing is annoying and typically needs to be redone every time they connect, so that's probably not useful outside of a one-off. If you just want the client to have no internet access by default (but be able to turn it on easily if they need it), add a custom DHCP config for that MAC. If you want to enforce the lack of internet access, do it through firewall rules.
If I've completely misinterpreted what you're trying to do, please provide more details.
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