Avaya PSN000642u User Manual
Product Support Notice © 2005 Avaya Inc. All Rights Reserved.
PSN #
Name of problem
Products affected
PSN000642u
Network cards and 802.1Q VLAN tags in packet capture
Publication date
Severity/risk level
30-Mar-2006
Medium
Issue #
Urgency When convenient
Issue date
2
1-Feb-2006
4600 Series IP Telephones - All versions - all releases
Problem description
Some Broadcom and Intel Network cards DO NOT show any 802.1Q VLAN tags in packet capture (e.g. Ethereal):
e.g
Broadcom 570x Gigabit integrated adapter (Dell Laptop)
Driver 8.48.0.0 Date 10/31/05
Intel PRO/1000 MT Mobile Connection (IBM T41 Laptop)
Driver 8.6.11.0 date 6/29/2005
Broadcom NetXtreme 57xx Gigabit Controller (Dell Desktop)
Driver 8.48.0.0 Date 10/31/05
Following Network cards DO show 802.1Q VLAN tags in packet capture:
3Com 10/100 mini PCI Ethernet adapter (Dell Laptop)
Driver 1.21.0.1 Date 7/21/2001
3Com Megahertz Model 3CXFE575BT (PCMCIA Card)
Driver 2.60.500.20
3Com EtherLink 10/100 PCI TX NIC 3C905B-TX (PCI Card)
Driver 4.31.0.0 Date 8/13/2002
Resolution
Workaround or alternative remediation
For Intel Cards, look at Intel Support site:
http://support.intel.com/support/network/sb/CS-005897.htm
For Broadcom Cards:
First update driver to latest version.
There is a registry key under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet that can be set to cause the driver
and chip not to strip the 802.1Q headers.
In order to set that key, you need to find the right instance of the driver in Registry Editor and set that key for it.
You can do this by doing following:
1. Run the Registry Editor (regedt32).
2. Search for "TxCoalescingTicks" under "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet" and ensure this is
the only instance that you have.
© 2005 Avaya Inc. All Rights Reserved. Page 1 of 3
3. Right-click on the instance number (eg. 0008) and add a new string value.
4. Enter "PreserveVlanInfoInRxPacket" and give it the value "1".
Save and Reboot
This should set you up to be able to sniff the VLAN tag information.
Remarks
Patch Notes
The information in this section concerns the patch, if any, recommended in the Resolution above.
Backup before applying the patch
n/a
Download
n/a
Patch install instructions Service-interrupting?
n/a No
Verification
n/a
Failure
n/a
Patch uninstall instructions
n/a
Security Notes
The information in this section concerns the security risk, if any, represented by the topic of this PSN.
Security risks
n/a
Avaya Security Vulnerability Classification
Not Susceptible
Mitigation
n/a
PSN000642 © 2005 Avaya Inc. All Rights Reserved. Page 2 of 3
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