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Wireless clients doing bridging

One of our customer is having some Wireless PC's that are doing brigding between the wired network and wireless network. This is causing a lot of issues, like the DHCP request getting leaked from the Wired VLAN to wireless VLAN, resulting in sporadic inaccessibilty for some client PC's. They have a very big network with a lot of Wireless clients and customer has limited administrative access to client PC's. My question is how can we track down the Wireless PC's that are configured for bridging ? Are there any tools or methods available to do this ? If anyone has come across this problem before, please advise what you did to resolve this issue.


Cisco Employee

Re: Wireless clients doing bridging

We recommend that WLAN is deployed on a seperate VLAN to wired devices. Following this guidence would prevent L2 spanning tree loops.

The Windows XP bridging feature does generate spanning-tree BDPUs. There is a feature in Cisco switches called BDPU-guard where the switch can be configured (on a per-port basis) to shut down any port from which it received a BDPU.

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