So...

New creates a New *LAN instance listening on 'port' for groupcache connections.

WithLogger specifies a logger for us to use.

WithSettings allows passing your own settings for peer discovery.

LAN provides a groupcache.PeerPicker utilizing schollz peerdiscovery.

IsPeer determines if a discovered peer is a peer for our groupcache.

Option is optional settings for the New() constructor.