ESXi VM NIC Lost Connectivity

Posted on 2012-09-16
Last Modified: 2012-09-29
Have a Dell 2950 III Server with two GB NICS in it. Patch cable is in NIC0 and connected to switch.

Running ESXi on the Server, management interface is

Can ping the management interface and can run VSphere client to connect to it.

See both of the VM's I created, One is a Domain Controller, The other an Exchange Server

Power up the domain controller, powers up, I log in, go to change adapter settings TCPIP to see what the config looks like...

IP =
SN =
Gateway =
DNS = (this is the dns server)

I cannot ping the gateway from the server.
I cannot ping the server from the laptop that running the vsphere client.

When I do an IP config I a get a weird reply (see screenshot).

The odd thing is that an hour ago at our office both these servers were up and running, all we did was shut down the vm's, shutdown the host and move it to a building 5 mins away.

Plugged them in.
Started Host, changed gateway on management network to reflect current network.
Started the Domain controller VM .....   BOOOM! that is when the issue started.

Any help is appreciated
Question by:tech911
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    first thing I note at some point replace the e1000 legacy nic with the high performance vmxnet3

    can you screenshot vSwitch networking in vSphere client
    LVL 3

    Accepted Solution

    I just figured it out...

    I had my command window up and behind it I found....

    Duplicate IP address found ( It would be nice if that would have popped up in front of the command window not behind.

    Sorry to have wasted your time.  Please post following this post that the solution is that you most likely have a duplicate IP on your network and I will be happy to accept the solution.
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    thats unfair , Im not chasing points, Request question be deleted or Accept your Solution as the Answer.
    LVL 3

    Author Closing Comment

    I figured it out accidentally.

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