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Hyper-V Host and VM cannot communicate but can reach everything else

Debate general Hyper-V Host and VM cannot communicate but can reach everything else

  • domingo, 15 de abril de 2012 22:13
     
     
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    Hi I have a setup of 16 Hyper-V hosts across three failover clusters (2 hosts, 7 hosts and 7 hosts)

    in each cluster host I have 6 NICs as follows:
    Public, Private, Live Migration, VN1, VN2 VN3

    each VM is using one the 3 VNs (VN1, VN2, VN3)

    now all Vswitches are configured as external and (allow management OS to.... ) is enables.

    any VM cannot reach its current host or other VMs using another Vswitch
    it can reach any other VM on the same host as long as using the same Vswitch or even hosted on other Hosts.

    any host can reach anything but cannot reach the VMs hosted on it.

    I am running out of ideas and could not reolve it


    appreciate your prompt response.

    Rateb
     

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  • martes, 17 de abril de 2012 3:07
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    Hi,
     
    First of all, as best practice, it is recommended that you dedicate one physical network adapter for Hyper-V host communication. In your environment, I suspect that the Public network adapter is the one for Hyper-V host communication. If so, when you create External Virtual Networks, you can uncheck the “Allow management operating system to share this network adapter”.
     
    By the way, please run “ipconfig/all” on the Hyper-V host machines and the virutal machines and then paste the output here.
     
     

    Vincent Hu

    TechNet Community Support

     
  • miércoles, 18 de abril de 2012 10:20
     
     
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    Dear Vincen,

    we already have a dedicated NIC for each public communication diiferent than the ones used to create the VNs.

    but we we tested yesterday is when we use this public NIC to create VN and associate some of the VMs to use this VN then they could reach the host, other hosts and other VMS on other hosts but not the VMs on the same host using different VN.

    we are discussing this with the hardware vendor and we do suspect network routing issues in the NICs used for the VNs but they say HW configuration for all NICs is identical.

    please advise what to do in order to solve this issue.

    Thanks,

    Rateb

     
  • miércoles, 18 de abril de 2012 11:26
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    Hi,
     
    Based on the Hyper-V networking principle, all virtual machines connect to the External Virtual Network can get IP addresses from your router or DHCP server in the LAN. So they act like physical machines in your environment. If all the network settings are configured properly, you should be able to ping them from each other.
     

    Vincent Hu

    TechNet Community Support