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NTP server misuse and abuse

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NTP vandalism is an expression that was first used by Poul-Henning Kamp in an open letter to the router manufacturer D-Link

The first known case of NTP vandalism was in may 2003, when netgear´s products flooded the University of Wisconsin’s NTP server with so many packets that it resulted in killing their server with a DDOS attack.

Latest known case is D-Links routers, that are contacting multiple Stratum 1 NTP servers, without respecting the restrictions of client types or geographical limitations. This resulting in a huge rise in traffic from thousands of private routers contacting the Stratum 1 servers, instead of D-Link’s own NTP servers.

Poul-Henning Kamp, who is the manager of the only Danish Stratum 1 server, made an investigation, to find out where the DDOS like amount of traffic came from.

He has been in contact with D-Link, but without being able to get any admittance, but has instead been accused of extortion, when presenting them for the bill for the extra traffic.

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