DEFCON [1-5] reads or sets a network-wide defence posture, each level
adding a restriction the engine and services enforce:
- 4: channel registrations frozen (ChanServ REGISTER)
- 3: all registrations frozen (the pre_register_check choke-point, covering
NickServ and the IRCv3 relay, plus channels)
- 2: sessions additionally capped to one per host
- 1: full lockdown — new connections are turned away on connect
Setting a level announces it to the whole network. Node-local level on the
db so services can read the derived freezes; admin-only.
Jean
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