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DTDIT
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Hyper-V Virtual Switch only allows one Virtual Guest access to the network

I have a new Server 2008 R2 with only the Hyper-V roll enabled.  the hardware is a HP Proliant DL380 G7 server

I have the host OS on a dedicated Nic, the Virtual Switch on its own dedicated Nic, the problem I have is if I connect more than one guest server to the virtual switch only the first conected server gets to pass network traffic.

I thought the purpos of the virtual switch was to allow your guest OS access the network.

the virtual switch is set for external and not to allow host os management.

my current work around is build a dedicated virtual swtich for each guest OS, so my limit is only 3 guest OS's

thank you
Windows Server 2008

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DTDIT

8/22/2022 - Mon
Svet Paperov

You are correct, the virtual switch is like a physical one where you can connect multiple servers, or virtual machines with virtual switch. Can you post some screen shots, please, of the configuration of the switch and  virtual machines?
ArneLovius

do you mean a virtual network rather than a virtual switch ?
DTDIT

ASKER
at this point I am not sure.  

from what I have been looking at and reading its the virtual switch in hyper-V the one you select as external, internal or private.

then when you add nics to the virtual guest OS you select that virtual switch.
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ArneLovius

in hyper-v it is called a virtual network, and they are managed by the virtual network manager.

I manage multiple hyper-v servers and have not experienced not being able to only have a single guest per virtual network.

how are you assigning MAC addresses to your guests ?
Svet Paperov

Microsoft uses both terms virtual switch and virtual network adapter as synonyms, so your confusion is understandable.

Please give us some screen shots of your config.
DTDIT

ASKER
I thought I did attach some screen shots before, I have attached them again.

the first one is the network config in hyper -v network managers, the 2nd one is the config in the guest os settings.
hypervnic1.jpg
hypervguestnic.jpg
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ArneLovius

that looks fine

I presume that both guests have addresses on the same subnet
DTDIT

ASKER
yes now they just pull DHCP, but I have tried Static IP as well.

I have not been able to find anything for the problem I am having.
ASKER CERTIFIED SOLUTION
Svet Paperov

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DTDIT

ASKER
yes they get the same MAC from the pool.   I will look into the physcial Switch, it is a cisco 3750, any idea's on how I would check that?
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William Peck
Svet Paperov

Yes, Cisco switches have this feature. I don’t remember the exact command to enable or disable it (it’s been a while I haven’t touch them) but I think it should be configurable on port basis, so look for some switchport commands (I presume you know how to get to the CLI of the switch, right?).
ArneLovius

You need to ensure that each guest has a different MAC address

it could well be a "port security" issue on the switch
DTDIT

ASKER
that was the issue.  Cisco Port Security.
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