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BugTraq
DoS of LAN via D-Link switches Mar 29 2005 12:40PM Frank Bures (lisfrank chem toronto edu) (1 replies) RE: DoS of LAN via D-Link switches Mar 29 2005 07:15PM David Gillett (gillettdavid fhda edu) (1 replies) Re: DoS of LAN via D-Link switches Mar 29 2005 09:29PM Tarmo Mamers (tarmo pobox com) (1 replies) Re: DoS of LAN via D-Link switches Mar 30 2005 02:21PM Neil Watson (bugtraq watson-wilson ca) (2 replies) |
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> From: Frank Bures [mailto:lisfrank (at) chem.toronto (dot) edu [email concealed]]
> Sent: Tuesday, March 29, 2005 4:41 AM
>> In my opinion, a switch should be immune to this admittedly insane
>> manipulation. Otherwise, one can DoS the entire network just
>> by shorting
>> two RJ-45 network outlets in one's office together.
>
> I believe what you are describing is officially called a bridge loop.
> A
> bridge loop occurs when a switch, or stack of switches are plugged into
> themselves. The result is that the switches report the same MAC
> address
> at multiple ports. The solution to this is called Spanning Tree
> Protocol. STP is a set of algorithms that help switches remove
> redundant MAC entries.
And it can be particularly hard to find. XO Communication's Irvine
Data Center has been struggling with what they believe to be the same
kind of problem for the last couple of days (and I've been struggling
with connectivity).
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