The information in this article applies to:
- Microsoft Windows NT Server versions 3.51 and 4.0
- Microsoft Windows NT Workstation versions 3.51 and 4.0
- Microsoft Windows 95
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-
- 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:
WARNING: Using Registry Editor incorrectly can cause serious, system-
wide problems that may require you to reinstall Windows NT or Windows 95
to correct them. Microsoft cannot guarantee that any problems resulting
from the use of Registry Editor can be solved. Use this tool at your own
risk.
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
3. Change the Value for NoSubnetSearch to 1.
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 here are manufactured by vendors
independent of Microsoft; we make no warranty, implied or otherwise,
regarding these products' performance or reliability.
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