North American Network Operators Group|
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Re: Open Letter to D-Link about their NTP vandalism
On Sat, Apr 08, 2006 at 10:51:27AM -0500, Church, Chuck wrote: > Since the intended (and announced) use of this server is just for DIX > networks, blocking NTP from any other networks should be trivial. That > IP address will still be hit by D-Link devices looking for a suitable > server, but with no response, they'll move onto another device, and > probably never try the DIX address again, at least until they're > rebooted. That alone should kill off 95% of the unwanted traffic > hitting the box, and probably 80% of the traffic even being sent to DIX > in the first place. > It would be nice if it were that simple. However there are an annoyingly large amount of poorly-written clients whose polling ratios do not decrease after they get no response from the server. There have even been some clients whose polling rate *increases* after they get no response.