1 Reply Latest reply on Jul 1, 2009 1:29 PM by bgmckown

    Intel 82566 DM Gratuitous ARP Storm with DHCP


      I hope someone could help me. I have the following problem with the Intel 82566 DM Network Adapter on Windows XP SP2 (also posted on HP dc7800 Forum).


      After rebooting PC or enabling / disabling network interface the DHCP renewal process will take up to 2 minutes, ultimately fail and cause a flood / storm of Gratuitous ARP messages (who-has IP x.x.x.x etc) sometimes lasting up to 2 minutes and totalling up to 1GB.


      This massive volume of broadcast traffic in turn causes 100% CPU spikes on our Cisco switches, which in extreme cases can cause temporary routing outage. All very undesirable events you may agree!


      I am suspicious of the Intel AMT software in this case and have tried the following to resolve (with mixed success!).


      Disabled Intel ME Engine (BIOS)

      Disabled Wake on LAN (BIOS)

      Disabled PXE ROM Download (BIOS)

      Disabled Magic Packet WON (Adapter)

      Disabled Directed Packet (Adapter)

      Disabled Intel Management Engine (Device Manager)


      System setup is as follows;


      Client OS: Windows XP Service Pack 2

      PC Model: HP dc7800 Series

      Network Card: Intel 82566 DM

      DHCP Server: Linux DHCPd

      Switch Infrastructure: Cisco Catalyst 4500 with Supervisor V (DHCP Snooping is enabled on this VLAN)


      So far i've been guessing as to the problem / solution and what i'm really need is a more concrete answer as to what is happening and why.


      An definite and / or official solution would be great as well!


      Thanks a lot.



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                  • 6. Re: Intel 82566 DM Gratuitous ARP Storm with DHCP

                    Hello, Mike,


                    Can you please elaborate on what "mixed success" you've had when disabling the various hardware and software features you identified?


                    In theory, if you've disabled the Intel(R) AMT Management Engine in BIOS, then you are basically left with only the on-board NIC and whatever software you've loaded into the host operating system. And, regarding the Intel(R) AMT software, this shouldn't have any impact on the operational functionality of the host operating system or the supporting network infrastructure. When the underlying hardware features (i.e., the Intel(R) AMT ME) are disabled, there isn't anything for the software components to control or interact with. Therefore, I don't believe either of these to be the cause of the ARP storm you are experiencing on your network.



                    - Brett McKown

                    Senior Software Engineer

                    Intel Digital Enterprise Group, Digital Office Platform Division

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                      • 8. Re: Intel 82566 DM Gratuitous ARP Storm with DHCP
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                        Have you tried upodating the AMT ME Firmware to version 3.2.3 http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=12454&prodSeriesId=3459240&prodNameId=3459243&swEnvOID=1093&swLang=13&mode=2&taskId=135&swItem=vc-68791-1 as well as the latest NIC Firmware http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=12454&prodSeriesId=3459240&swItem=vc-72171-1&prodNameId=3459243&swEnvOID=1093&swLang=13&taskId=135&mode=3 that are now available on the HP support site yet.


                        Give them a try and see if the issue no longer exists with AMT enabled.


                        Larry C. Lauritzen
                        Digital Office - Problem Resolution Engineering
                        Intel Corporation - Digital Enterprise Group

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