reconnect from a ban with same IP how?

[tempest]

Just that - in theory - you can't because - theory again - it should disconnect you. (And I don't know how it would be possible to give youself an invalid cn anyway!).

Edit: And it won't even process your input, for starters:

[SELECT ALL] Code:

if(valid_client(cn)) process(event.packet, cn, event.channelID);