VMware vSphere

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  • 1.  vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Posted Oct 25, 2012 04:50 PM

    Hi all

    I try to install a vSphere 5.1 environment (vCenter 5.1 (799731)).. it was never that hard to get a VMware product running.


    Problem: 

    As soon as i create a HA Cluster (with 2 ESXi 5.1 (799733)) i receive the message:

         "vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected"

    I have tried everything..

         place vCenter in other Networks

         Multihome vCenter

         place vCenter in the same network like the ESX hosts

         doublechecking ip's, subnets, gw's, name resolution, vSwitches

    nothing helps.. is it a bug?

    vCenter and also the two ESXi Hosts resides now in the same L2 network.

    ESX1:     10.254.250.74     255.255.255.0

    ESX2:     10.254.250.77     255.255.255.0

    VC:          10.254.250.29     255.255.255.0

    The message can't be correct.

    Please.. @ anybody out there... HELP! I'm at the end of my knowledge.

    Regards

    Adrian



  • 2.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Posted Oct 25, 2012 04:59 PM

    Can you ssh into one of the ESX hosts and see if you can ping the other one? Also, look for errors in the fdm logs (/var/run/log/fdm.log) - that is the HA agent.

    Elisha



  • 3.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Posted Oct 25, 2012 05:11 PM

    Hi ... you are right.. pinging the other host is not possible.. confuses me.. do you have a clue why i can't ping?

    They are in the same Subnet...



  • 4.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Posted Oct 25, 2012 05:08 PM

    Only a guess. Please double check DNS resolves the names properly, e.g. no typo in the Host-A DNS entries.

    André



  • 5.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Posted Oct 25, 2012 05:16 PM

    DNS seems to work properly



  • 6.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected
    Best Answer

    Posted Nov 02, 2012 04:31 PM

    Can you verify the VLAN config on your physical switch?

    mike



  • 7.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Broadcom Employee
    Posted Nov 03, 2012 07:02 PM

    1) try to ping the gateway from both of the hosts

    2) try to ping host 1 on host 2, try to ping host 2 on host 1

    3) validate VLAN config on portgroup

    4) validate VLAN config on network port

    5) validate MTU on portgroup/vmkernel

    6) validate MTU on physical network



  • 8.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Posted Jan 31, 2013 01:04 AM

    It was not really a VLAN issue. But our four link etherchannel was missconfigured.



  • 9.  RE: vSphere HA detected that this host is in a different network than the master to which vCenter Server is connected

    Broadcom Employee
    Posted Jan 31, 2013 11:09 AM

    Adrian Hofstetter wrote:

    It was not really a VLAN issue. But our four link etherchannel was missconfigured.

    One of the reasons I am not a fan of etherchannels... too often things go wrong.