Bay Networks claimed today that a problem on the Internet is causing Cisco routers worldwide to crash. Trevor Dearing, product marketing manager at Bay UK, said: ?ISPs are installing software that stops it but Cisco routers are stopping working.?
He said ?There is a new denial of service attack out on the Internet called Smurf. What it does is send ICMP echo requests from a spoofed source address to about 40 different broadcast addresses across the Internet."
He added: ?What results is a massive number of ICMP echo replies to that source address. Some ISPs are reporting up to 32Mbps worth of traffic coming into their network. Some have tried to block ICMP at their routers using access lists. This type of thing is process switched in the Ciscos and, of course, makes the router ?blow up?.?
But Simon Poulton, technical marketing manager of Cisco UK, said: ?This sounds like there?s a virus attacking servers of people who are configuring their routers to prevent access.? He said he had not heard of the Smurf problem.
James Gardiner, marketing director at Internet service provider Demon Systems UK, said: ?We don?t use Cisco routers or switches. For technical reasons we build our own routers and so have a high level of independence.? He agreed there could be problems if people were trying to connect to other systems which did use Cisco routers.
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