The default behavior of Minecraft is to allow anybody onto your server. It is advisable to whitelist which players can connect to your server to protect from greifers, this can be a problem even if you do not publicly share your IP address.
The default behavior for most Minecraft servers is to disable command blocks. Command blocks are a special block only placable by operators, this block can run Minecraft commands when a redstone signal is received.
The default behavior in Minecraft is to kick players who fly, this is to prevent players who use hacked clients. If you're are playing with friends or get kicked by mistake it can be a good idea to disable this protection.
We make it as easy as possible to add new Forge mods to your Minecraft server.
A whitelist is a way of preventing people that you do not know from joining your Minecraft server - we highly recommend enabling the whitelist on any private servers.
