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Remove Network Bridge

Posted on 2016-08-31
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Last Modified: 2016-09-07
I have a Windows Server 2012 R2 with 4 on board NICs, someone prior to me set up the server with what appears to be a network bridge between 2 of the 4 NICs. The network property page for each of the NICs in question report back that they are part of a bridge. I do not see the usual Bridge icon in the Network and Sharing control panel. I do not see one listed in device manager either. From what I have been able to deduce, the consensus is to uninstall the NICs via device manager, reboot and allow the system to re-install them. As this server is running among other things, SQL server, and it is in an active production environment, I was hoping not to have to go that route. So any chance there might be a silver bullet that I can use to regain control over these 2 errant network interfaces?
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Question by:Bob Conklin
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12 Comments
 
LVL 43

Expert Comment

by:Adam Brown
ID: 41778701
Does the server have Hyper-V installed on it? If so, the bridged NICs are bridged to the virtual switch in Hyper-V. If that is the case, they won't appear as a bridged NIC, but there will be a "virtual" NIC in the adapter list.
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Author Comment

by:Bob Conklin
ID: 41778716
I do not see where Hyper V has been configured on this server, its twin is running Hyper V and I see on that server the virtual switch in the network control panel. I have attached a few screen snips of what I see.
Bridge1.JPG
Bridge2.JPG
Bridge3.JPG
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LVL 43

Expert Comment

by:Adam Brown
ID: 41778749
Select one NIC, hold CTRL and select the other, right click on one of them, and it should give you the option to remove the bridging.
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Author Comment

by:Bob Conklin
ID: 41778760
Had tried that too.....
Bridge4.JPG
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LVL 43

Expert Comment

by:Adam Brown
ID: 41778768
Do you have any third party NIC teaming software installed?
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Author Comment

by:Bob Conklin
ID: 41778772
The Broadcom BASCs suite is installed but not configured and the services are set to not start.
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LVL 43

Expert Comment

by:Adam Brown
ID: 41778798
When you right click the NICs and select properties, does it show a sharing tab and the list of protocols on the NIC or just the name of the NIC with a configure button?
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Author Comment

by:Bob Conklin
ID: 41778816
All that appears in the "Configure" button, no normal tabs to set the protocols, IP address, etc.
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LVL 43

Assisted Solution

by:Adam Brown
Adam Brown earned 2000 total points
ID: 41778830
Okay. You're going to have to re-install the drivers for the NIC if that's what's showing up. You might be able to get it going right with a reboot, but that's probably more disruptive than re-installing the adapters.
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Accepted Solution

by:
Bob Conklin earned 0 total points
ID: 41780181
Ok so here is what "fixed" this issue. I took the 2 unassigned NICs and made them into a bridge. The bridge icon showed up in the control panel as it should. At this point I had 4 NICs, and 1 bridge in the control panel. I selected the bridge that I just created and used the "delete" choice from the right click menu, the OS proceeded to process the request. At this point my RDP session disconnected and my endless ping that I had going also dropped out. In about 3 minutes, the ping returned and I was able to re-establish my RDP session. I now have 4 NICs in the control panel, no bridges or virtual switches and I can access the properties tab on all 4 NICs.
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LVL 43

Expert Comment

by:Adam Brown
ID: 41780187
Good to know. Thanks for putting up the solution.
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Author Closing Comment

by:Bob Conklin
ID: 41787486
With Adam's insight and my own troubleshooting the issue was resolved.
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