Hyper-V screwed up DHCP?

I turned on Hyper-V in Windows 2012 Standard so that I could install Windows 8.1 in a VM and test.  The first problem I had was that the VM could not get to the outside world.  I believe it had a 10.100.1.x address.  I changed the filtering
setting on the virtual switch so that it could see the outside world and rebooted 8.1.  After reboot, it had a proper address and was able to see the outside world.  Today, though, most of the computers are getting 10.100.1.x addresses!  That
means they don't work.  I have tried a number of things to no avail.  I just completely uninstalled hyper-v and rebooted the server.  I will be checking shortly to see if that fixed things.  Does Hyper-V have its own DHCP server?  If
so, how do I turn it off?  I assume uninstalling will get rid of it, unless it is using the built-in Windows DHCP server in some weird way that is not showing up in the config. 
If that doesn't do it, what do I need to do to get things back to normal?
Thanks!

Hi,
Hyper-V is a virtualization platform only. There is no DHCP service offered within the Hyper-V role itself.
The possible reason is that you have a DHCP service running on the Hyper-V host machine as a separate role. It seems to listen to requests coming from all connections including the VM and every other computer on the physical network. If you already have
a DHCP service running on your network like in the router or another server, you need to disable or uninstall the DHCP role in the Hyper-V host machine. This is why you get 10.100.1.x everywhere.
Have you configured the vEthernet NIC to a fixed IP address ? Easier to manage a Hyper-V with a fixed IP address. You can set the IP to one outside the DHCP pool of IP addresses already being offered by your current DHCP server
In your virtual Switch Manager, is your switch set to External ? this is the way to go, so that you would be able to see both the host and the outside world. Your Win8.1 VM will send a DHCP request to whoever has an IP pool available to provide an IP. The
first one responding seems to be your Hyper-V host, which shouldn't.
By having the Virtual Switch Manager as external, it will create a bridge to your current network and your Win8.1 VM will be able to receive the IP address it should receive from the other DHCP service already running on your network. Everything else should
be falling back into place by renewing each computer's and device's IP address.
Please provide feedback on how it goes.

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    IPv4 Address. . . . . . . . . . . : 192.168.1.4(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.1.254
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    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-67-52-8F-9C-8E-99-52-15-93
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    The link again:
    http://blogs.technet.com/b/keithmayer/archive/2012/11/26/configuring-dhcp-in-windows-server-2012-early-experts-challenge-exam-70-410.aspx
    Direct step links:
    Authorize a DHCP Server
    Create and configure scopes
    Configure a DHCP reservation
    Configure DHCP options
    Configure a Client and Server for PXE Boot (BOOTP)
    Configure IPv4 DHCP Relay Agent
    Configure IPv6 DHCP Relay Agent
    Regards,
    Steve
    My System Center Blog

  • PXE Boot a Hyper V Guest - Not receiving a DHCP IP Address

    Hello Everyone,
    I am trying to PXE boot a Hyper V guest, but am not getting a DHCP IP Address. Eventually the DHCP query times out and loads into the guest OS I have manually installed. See the PXE Boot Screen below. When in the installed guest OS, I do receive
    a DHCP IP address as shown below. I am utilizing the Legacy Network Driver.  I don't think it is related to VLAN identifier, but tried with/without and still no go. Any ideas what could be preventing this? Please let me know.
    PXE Boot Screen:
    CLIENT MAC ADDR: 00 15 5D F2 99 0C  GUID: B366BBA1-D503-4D64-A77E-77474F3A2193
    DHCP.........-
    PXE-E51: No DHCP or proxyDHCP offers were received.
    DHCP IPCONFIG in Guest OS:
    Ethernet adapter Local Area Connection:
       Connection-specific DNS Suffix  . : mywork.com
       IPv4 Address. . . . . . . . . . . : 10.242.242.251
       Subnet Mask . . . . . . . . . . . : 255.255.255.128
       Default Gateway . . . . . . . . . : 10.242.242.129
    Thanks,
    Ron

    Hi Ron,
    A solution is provided in this thread. You may need to have a look on the steps below:
    • PXE-E51: No DHCP or proxyDHCP offers were received.
    The client did not receive any valid DHCP, BOOTP or proxyDHCP offers. To resolve this issue, check each of the following network configuration items:
    DHCP services are not available on the network to which the PXE-enabled NIC is connected.
    A DHCP proxy or IP helper address is not configured for the subnet on which the PXE client is connected.
    The switch port connected to the PXE NIC is running Spanning Tree Protocol, EtherChannel Protocol, or Port Aggregation Protocol and is thus not activated immediately when a link is detected. This forces the DHCP request from the PXE client to timeout.
    DHCP is available on the network, but PXE is not.
    The network cable is not attached to the PXE-enabled NIC on the target server.
    See: http://social.technet.microsoft.com/Forums/en-US/d06413a4-af2b-4736-a510-c0a68eb880cf/cannot-get-certain-machines-to-pxe-boot
    TechNet Subscriber Support in forum |If you have any feedback on our support, please contact [email protected]

  • How do I get RDP Access to Hyper-V host when DC and DHCP server is down and is a VM on that host.

    My host machine is a Windows Server 2012 running SBS 2008 as a VM.
    How can I configure a Hyper-V environment to allow me to RDP into the Hyper-V host in order to start individual VM's.
    It seems that without the DC running (which happens to be a VM on the same host) the host does not have an IP address that I can RDP to. I also cannot assign it a static IP.
    With the VM DC running I can RDP into that and then RDP from that to the Hyper-V host but I would like to be able to have the ability to access all VM's and be able to start and stop them as required, remotely.

    The SBS 2008 server has a static IP and the NIC on the Hyper-V host is used by the Virtual Switch so a static IP cannot be assigned to the NIC on the Hyper-V host.
    If you only have one physical adapter in your Hyper-V host and it's hosting the virtual switch, then you'll need to create a virtual adapter on it for the host to use.
    You can check the "Allow management operating system to share this network adapter" in the "Virtual Switch Manager" inside "Hyper-V Manager". You'll automatically get a network adapter that shows up with the others on that system where you can give it IP
    and DNS information.
    You can also do it in PowerShell:
    Add-VMNetworkAdapter -ManagementOS -SwitchName ((Get-VMSwitch).Name) -Name Mgmt
    New-NetIpAddress -IPAddress ###.###.###.### -InterfaceAlias "vEthernet (Mgmt)" -DefaultGateway ###.###.###.### -PrefixLength ##
    Set-DnsClientServerAddress -InterfaceAlias "vEthernet (Mgmt)" -ServerAddresses ###.###.###.###, ###.###.###.###
    Then you'll have an IP you can connect to from remote systems.
    Eric Siron Altaro Hyper-V Blog
    I am an independent blog contributor, not an Altaro employee. I am solely responsible for the content of my posts.
    "Every relationship you have is in worse shape than you think."

  • Hyper-V vEtherNet taking IP from DHCP

    I am finding strange behavior of Hyperv 2012R2 host vEthernet. We have created VM network where multiple VLAN's are tagged for different projects. Now when I create those VM network it also create vEthernet. All these VLAN's are DHCP enabled so that VM's
    does PXE boot and connect to Citrix provisioning server.
    But now I am seeing all the host which has vEthernet created also go and grab IP from this VLAN. This VLAN's IP are decided based on number of VM which will created. Say I have 10 VLAN's and 10 host
     I will vouch 10*10=100 IP's which is not fair . 
    Is it the known behavior or we can control this ?
    Funtoosh 

    If you have the checkbox set to "allow operating system to share.." causes a vNIC to be created on the hypervisor and attached to that virtual network.
    Considering that these are PXE streaming networks for PVS - I would ask: why is this necessary?   (because not doing this would solve your problem)
    Also, default windows behavior is that when there is a new NIC, it is set to DHCP by default - Windows has behaved this way since I first began in IT with NT 3.51
    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.
    Disclaimer: Attempting change is of your own free will.

  • Hyper-V in Windows 8.. VM cannot get DHCP IP address

    I had Both Virtual Box and Hyper-V on the same machine, I decided trying to shut down Hyper-V all the time was too much trouble so I removed VirtualBox.
    Since then no machine can get a local IP address from the router.
    I have even setup the virtual connections again:
    I have various CentOS installs which I installed with generation 1.
    I even tried changing the LAN Adapter to a "Legacy" one, but it still fails.
    Any advice as to what is going on with this?
    Thanks

    Hi trentcreek,
    >>I switched to STATIC IP using the Google DNS of 8.8.8.8.
    >>I can see the virtual Ethernet, which I am having the guest OS use, status as connected, and has internet access.
    >>It still refuses to connect
    After configured static IP for that VM then it can access virutal Ethernet and internet .
    I want to know what's the meaning of "It still refuses to connect" .
    First please ensure that VM connected to correct "external virtual switch".
    Also I noticed that you have enabled "Allow management operating system to share .." and the external virtual switch is bounding to Wireless NIC .
    I suggest you to create an external virtual bounding to wire NIC then test again .
    Here is an article regarding the common issue of bounding external switch to WIFI ：
    https://social.technet.microsoft.com/Forums/sharepoint/en-US/de699f22-0761-4657-a651-9429aaa488f4/forum-faq-how-to-resolve-the-network-connectivity-issue-of-the-external-virtual-nic-which-binds-to?forum=winserverhyperv
    Best Regards
    Elton Ji
    We
    are trying to better understand customer views on social support experience, so your participation in this
    interview project would be greatly appreciated if you have time.
    Thanks for helping make community forums a great place.

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