When computers see each other, but no communication
NMC doesn’t work on link-local addresses, although the instances "see" each other. You must configure your computers within these IP ranges:
- 192.168.0.0 - 192.168.255.255
- 172.16.0.0 - 172.31.255.255
- 10.0.0.0 - 10.255.255.255
Subnet mask should be the same on all computers, usually 255.255.255.0
A dedicated network is suggested to use this feature, preferably with wired connection, because wireless connections tend to loss UDP packets more often.
When computers don’t see each other
This is happening because something is blocking computers to use Bonjour discovery. This could be
- a 3rd party app firewall app,
- or if you’re on macOS 15 Sequoia, make sure Mitti has permission to use “Local Network” in macOS Privacy & Security settings.