[MUD-Dev] Gearing up against GEAR

Dan MacDonald danmac at windows.microsoft.com
Sat Jul 21 11:11:43 New Zealand Standard Time 2001


> -----Original Message-----
> From: Ted Milker [mailto:tmilker at radiks.net]

> Hi everyone, I've been following the problems the Asheron's Call
> developers have been having with a program called "GEAR".  There
> are a lot of rumors floating around about how exactly this program
> works.  The one explanation that sounds the most plausible to me
> is that it plays with the speed of Window's timer functions.  Does
> anyone have any concrete evidence that this is the way it works?
> Can someone explain exactly how Turbine allowed this to happen in
> the first place?  I'm aware of the first rule of network
> programming, never trust the client, and surely they must have
> been aware of it too, so what went wrong?  I think it'd be very
> useful to the development community at large to be aware of this
> issue and the pitfalls to avoid doing when developing future
> games.

Here's a link to Dr.Twisters Gear page. Apparently it works for
other Games as well, essentially what it does is multiply the
packets sent By the client up to 256 times, confusing the server.

  http://ac.drtwister.com/files/dtn-gear.shtml

AC will begin testing their anti-GEAR code internally on Aug. 3rd.

Dan MacDonald
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