~> preferred <bool> <server ip>
Sets or resets "preferred" flag on the server with a given IP address.
Preferred servers are never cleaned up, they're promoted to master servers faster, and are the last ones demoted. Also, they're placed at the top of the servers list, so they will be the first ones MLdonkey will attempt to connect to.
~> preferred true 220.127.116.11
This command first appeared in MLdonkey 2.5-25.