1 / 7

The Great Network Storm of ’03

Learn about the network storm of 2003 caused by ill-formed Ethernet packets and how it disrupted systems, leading to a major control system halt. Discover the short-term and real solutions implemented to prevent a recurrence.

alstond
Download Presentation

The Great Network Storm of ’03

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Great Network Storm of ’03 A Cast Of Thousands

  2. History • In a May 31, 2003 message to tech-talk Lawrence Hoff (Brookhaven National Laboratory) mentioned: • memPartInfoGet bug which corrupted the heap (!!) • a Wind-River Systems Software Problem Report of ill-formed Ethernet packets causing multicast storms. • that BNL had worked around the bug by disabling IP forwarding

  3. Summary • HP89441 VSA sends malformed packet • All devices on ‘.2’ subnet receive packet • vxWorks bug causes IOCs to forward packet back to the network (!!) • Exponential increase in network traffic (theoretically 24064 ≈ 2x10158 packets) • Control system grinds to a halt

  4. The HP89441 as seenby the APS control system

  5. Short-Term Solution • Stop the IOC which was communicating with the HP89441. • Disable packet forwarding in as many IOCs as possible • IOCs with associated MVME162 card must have packet forwarding enabled • Devices over which we have not control have packet forwarding enabled • Any N>1 is going to make N64 a big number!

  6. Real Solution • Add packet filter to network switch • Not possible with our switches • Testing ‘home-network’ 2-port router • Fix bug in all vxWorks machines • More than just IOCs • Fix bug in HP89441 • HP/Agilent aware of problem

  7. Warning! YOUR SYSTEM COULD BE NEXT!

More Related