There are scripts out there to prevent it; heres one that I found, but I'm sure there are better ones out there
"There exists a script which, through a series of aliases and binds, will drop all clients connected to a server running mani when run multiple times in succession (With the error message "Disconnect: Client XX overflowed reliable channel").
After a bit of collaboration with some of the people who were using the crash script, I have put together a quick and dirty workaround which appears to prevent script kiddies from dropping clients via the channel overflow exploit. You can find the script here:
--------http://code.eventscripts.com/80170--------
It basically just checks to make sure that people aren't sending the commands which can be used to drop clients at an absurd rate. If such a thing happens, it will kick the offender and print their name in the chat area. It's probably not the best or most efficient way to do this, but as far as I can tell it works. I'm not sure if these are all the commands which one can use to cause it, but after some very brief testing it seems to work consistently."
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