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Internet Clocks Threatened By Domestic Equipment 2006-04-13

Posted by clype in Gizmo.

Home network hardware supplier 'D-Link' has been accused of harming the net's ability to tell the time accurately.

Detective work has found that many 'D-Link' routers, switches and wireless access points are bombarding some net time servers with huge amounts of data. Time servers help many net functions run smoothly. For instance they have a role in deciding who made the last bid in 'eBay' auctions. 'D-Link' is now taking action after protests from time server overseers.

Time trouble:

The problems caused by 'D-Link' hardware came to light thanks to Danish contractor Mr.Poul-Henning Kamp who runs Denmark's time server. Typically the time servers have links with atomic clocks to ensure they are as accurate as possible.

Mr.Kamp said his time server started getting hit with a lot more traffic than usual in 2005-08. Initially he thought it was a web attack as some viruses use web clocks to co-ordinate their activities. However, digital detective work by Mr.Richard Clayton from the security research lab at 'The University of Cambridge' Mr.Kamp said a new line of products sold by 'D-Link' has the list of the net's time servers written into the software that keeps the devices running. Further detective work has revealed the 25 or so 'D-Link' products checking the time using this list.

The data flood is causing Mr.Kamp problems because his time server is run on a non-profit basis and is allocated a small amount of bandwidth for the 2 000 or so Danish organisations that use it to tell the time. The data flood has seen his bandwidth bill rocket and Mr.Kamp is contemplating shutting the server down as he cannot afford the continuing costs.

  • Now, up to 90 per cent of his daily traffic comes from 'D-Link' devices.

Accurate time-keeping is vital for many of the net's functions such as time stamping when people buy and sell goods via the net. Mr.Kamp said one reason the Danish time server was set up was to help police get accurate timelines for some computer crime cases. Mr.Kamp said the responsible way to interrogate the time servers would be for 'D-Link' to set up its own computer that can tell all its products the right time rather than have each device act alone.

Campaign call:

Frustrated by his dealings with 'D-Link' over the last five months, Mr.Kamp published an open letter about the problems on his website. This has revealed that 'D-Link' hardware is also causing problems for 50 other net time servers. The list includes some run by the USA military, 'Nasa', USA research organisations and government groups around the world.

'My server is not the only one they are abusing,' said Mr.Kamp, adding that it was hard to get an accurate idea of the scale of the problem.

'It could be millions of "D-Link" devices,' he said,

'I have no way of figuring it out.'

A spokesman for 'D-Link' said that the company was aware of 'developments' but had no comment while it takes legal advice. He said the company expected to issue a statement in the next few days. However, Mr.Kamp said that publishing the open letter appears to have re-started efforts to solve the problem.

  • Already 'D-Link' has removed from its website, updates to the software that keeps its hardware running that contains the time server list.

'At least the problem's not getting any worse,' said Mr.Kamp, adding that pressure from other time server administrators could force 'D-Link' to act.

It was unrealistic to expect 'D-Link' to update the onboard software of all the hardware that is using the list of time servers, he said. Instead, he would like 'D-Link' to pay his bandwidth bills to ensure the Danish time server can keep going.


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