You can't read what ~SeRk is writing? If you send the packet just 1 time it won't do anything. It won't affect the server, in other ways it won't lag it. You need to send the packet many times, as ~SeRk says send it x80.
What's the fun to lag a server? You just make me to fix useless trush.
By the next restart of l2deathwhisper, if you do that you'll get automatically kicked.
I found a way to fix it, so when L2DeathWhisper comes up again, this bug won't work anymore.
Thanks for posting such a great bug, it works in many many servers.