At our office, we have a local area network with a purely internal DNS setup, on which clients all named as
whatever.lan. I also have a VMware environment, and on the virtual-machine-only network, I name the virtual machines
Currently, this network for the virtual machines isn't reachable from our local area network, but we're setting up a production network to migrate these virtual machines to, which will be reachable from the LAN. As a result, we're trying to settle on a convention for the domain suffix/TLD we apply to the guests on this new network we're setting up, but we can't come up with a good one, given that
.lan all have existing connotations in our environment.
So, what's the best practice in this situation? Is there a list of TLDs or domain names somewhere that's safe to use for a purely internal network?