Get the latest tech news
Don't pick weird subnets for embedded networks, use VRFs
Don't pick random subnets to avoid IP address conflicts on foreign networks, use VRFs!
I have a portable rack right here with a Behringer X-Air audio mixer in it and this is just modern enough to allow you to use DHCP to get an address, no IPv6 support in here whatsoever. This sends a broadcast ping to your local segment and then you can read out the list of neighbors known on that interface, which also conveniently tells you which device is advertising routes. It is impossible to reach other devices in my home network through it though because the routing table for the rack will just send traffic destined for 10.0.0.0/24 back out the same interface instead of the WAN port.
Or read this on Hacker News