Last month we had multiple players join our network and use insecure packets from various mods to grief or spawn items, these players have been manually banned. During this time I started to create a patch for every exploit in all these mods with insecure packet handling. These patches have been active for a few weeks now. They not only prevent these exploits from working, but also permanently ban the offenders. It's impossible to trigger the ban for those who don't modify packets.