I have a device (Nintendo Switch) on my home network that I’d like to be able to connect to other devices on the LAN, but I want to keep it from accessing anything outside that network (or more specifically, Nintendo’s servers). It’s modified and don’t want to risk a hardware ban, etc. Is there a relatively easy way to do this? I run Kong’s ddwrt on my router but I only have pretty basic knowledge of networking. I know that I could probably setup a DNS on my home server to block those IP’s, but that seems fairly risky as the device in question could potentially bypass that DNS(afaik), but again, networking isn’t my forte. Any ideas on how I could make that happen?