We use a custom packet sniffer sensor to collect IEEE 802.1Q VLAN information on our network. The VLAN tags are correctly displayed in the according toplist when setting the sniffer sensors up using any network card but not when monitoring traffic that passes a Broadcom Ethernet Adapter.
What can I do to show VLAN information tags of a Broadcom Ethernet Adapter?
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This article applies to PRTG Network Monitor 14 or later
Showing VLAN Tags of a Broadcom Ethernet Adapter
If you monitor data packets that pass your Broadcom Ethernet Adapter using the Packet Sniffer (Custom) Sensor, you will not be able to simply show VLAN information tags in the packet sniffer toplist. You will see an empty column in the toplist table instead. This is not an issue of PRTG, but Broadcom Ethernet Adapters discard the 802.1Q headers by default.
To cause the network card not to strip these headers, you have to edit the Windows registry. Please see the following article for detailed instructions:
Caution: Please back up your system before manipulating the Windows registry!
Feb, 2015 - Permalink
This article applies to PRTG Network Monitor 14 or later
Showing VLAN Tags of a Broadcom Ethernet Adapter
If you monitor data packets that pass your Broadcom Ethernet Adapter using the Packet Sniffer (Custom) Sensor, you will not be able to simply show VLAN information tags in the packet sniffer toplist. You will see an empty column in the toplist table instead. This is not an issue of PRTG, but Broadcom Ethernet Adapters discard the 802.1Q headers by default.
To cause the network card not to strip these headers, you have to edit the Windows registry. Please see the following article for detailed instructions:
Caution: Please back up your system before manipulating the Windows registry!
Feb, 2015 - Permalink