DOCUMENT:Q164609 11-JUN-2002 [crossnet] TITLE :HP JetAdmin 2.33 may cause ARP Storm on Network PRODUCT :Windows for Workgroups and Windows NT Networking Issues PROD/VER::3.51,4.0 OPER/SYS: KEYWORDS:kb3rdparty kbinterop kbnetwork kbusage ====================================================================== IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base: Q256986 Description of the Microsoft Windows Registry ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 3.51, 4.0 - Microsoft Windows NT Workstation versions 3.51, 4.0 - Microsoft Windows 95 - Microsoft Windows NT Server version 4.0, Terminal Server Edition ------------------------------------------------------------------------------- SUMMARY ======= When you diagnose network traffic using a network analyzer, a large series of address resolution protocols (ARPs) in sequential order may be detected. This problem can cause network access and traffic to and from all hosts to become temporarily disrupted. One of the possible causes of this behavior is the result of Hewlett Packard's JetAdmin JetDirect discovery tool, which is silently installed when a Hewlett Packard published driver is installed in Windows from a disk. One of Hewlett Packard's JetAdmin 2.33 methods to discover all JetDirect devices (printers) running TCP/IP requires that a ping be sent to every address in the subnet. Although this may provide a very thorough list of devices, it can also generate a huge amount of network traffic. Take, for example, a Class A network address. If JetAdmin were to run, approximately 7 million packets, in succession, will be transmitted upon startup of this utility. WORKAROUND ========== There are two possible resolutions to this issue: - Download JetAdmin version 2.40 from Hewlett Packard's Web site. Hewlett Packard's JetAdmin version 2.40 also provides discovery of printers through broadcasts, as well as the ping method described above. Additionally, the ping method has been modified in version 2.40 so that it will, by default, not send pings to more than 2000 addresses without modifying the registry. -or- - WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk. Hewlett Packard's JetAdmin Tool version 2.33 is designed to work in the manner described. On the majority of networks where Class C subnets are used, this behavior will not be a problem because of the small number of broadcasts generated. However, if you have a subnetted class B or class A network, Microsoft recommends that you contact Hewlett Packard for further support. To disable this feature, a change in the Registry must be made. To make this change, perform the following steps: 1. Start the Registry Editor (Regedt32.exe for Windows NT and Regedit.exe for Windows 95). 2. Change the following key located under: HKEY_LOCAL_MACHINE\SOFTWARE\Hewlett-Packard\HPJetAdmin\TCPIP Change the Value for NoSubnetSearch to 1. 3. In addition, if you run the JetAdmin application, the following option can be selected and disabled or enabled: Options\Preferences\TCPIP Discovery\Broadcast The third-party products discussed in this article are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability. NOTE: JetDirect is no longer supported by HP. SDI (Simple Device Installation) is now used to install network printers. For more information on this, see: http://www.hp.com/cgi-bin/cposupport/ccsearch/getdoc?doc=bpj05973 or http://www.hp.com/cposupport/networking/support_doc/bpj06765.html HP recommends a new software admin package (TCP/IP / IPX/SPX based). For further information see: http://www.hp.com/cgi-bin/cposupport/ccsearch/getdoc?doc=bpj06723 or http://www.hp.com/cgi-bin/cposupport/ccsearch/getdoc?doc=bpj06724 Additional query words: crash hang storm ====================================================================== Keywords : kb3rdparty kbinterop kbnetwork kbusage Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT351search kbWinNT400search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbNTTermServ400 kbNTTermServSearch kbWinNTS351search kbWin95search kbZNotKeyword3 Version : :3.51,4.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.