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Virtual Server 2005 R2 VMs can't see each other - different physical hosts

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  • Virtual Server 2005 R2 VMs can't see each other - different physical hosts

    Hi,

    I have several VS 2005 R2 Virtual servers running Win2k3 SP2, doing a variety of things. The odd thing is: I have one server hosting Sharepoint about to be replaced by a new Sharepoint build (long story...) on another VM (and a separate physical host) and want to move content from one to the other, but they can't ping each other.

    All other network machines can be pinged from both VMs, they both have "normal" connectivity to the internal and external network (including the "other" VM's physical host) in all other respects, just can't see each other. Weird. I read something somewhere (can't find it now) that MAC conflicts could cause this, but I've checked and both VMs are using Dynamic MACs, and the actual MACs don't conflict (as you'd expect...)...

    Anybody else seen this? can help?

    many thanks in advance..

    Steve.

  • #2
    Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

    Hi.
    How are the two machines set regarding their network configuration? Are they NAT? Are they set to use directly the physical card?
    Can you ping one machine from another (and vice versa)?

    Sorin Solomon


    In order to succeed, your desire for success should be greater than your fear of failure.
    -

    Comment


    • #3
      Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

      Hi,
      both machines are using the physical card on their respective machines directly...no NAT. They can ping everything else on the network, but not each other !
      cheers,
      Steve.

      Comment


      • #4
        Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

        No firewalls running?
        cheers
        Andy

        Please read this before you post:


        Quis custodiet ipsos custodes?

        Comment


        • #5
          Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

          nope - no firewalls...

          Comment


          • #6
            Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

            I would run ipconfig /all at the command prompt, just to be sure that the network configuration is the same on both (except IP, of course) and to see they have different MAC addresses (although, if there was an IP conflict, one of them wouldn't have network connection at all...).
            Another thing I would do is to run tracert [IP address] from each VM to the other one. If you could, post the results (delete IP addresses or any other info you don't want on the Net).
            Good luck.

            Sorin Solomon


            In order to succeed, your desire for success should be greater than your fear of failure.
            -

            Comment


            • #7
              Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

              Here we go - ipconfig from the 2 machines:

              Machine A:

              Windows IP Configuration

              Host Name . . . . . . . . . . . . : xxxxx
              Primary Dns Suffix . . . . . . . : xxxxxxxxxxxxxxx
              Node Type . . . . . . . . . . . . : Unknown
              IP Routing Enabled. . . . . . . . : No
              WINS Proxy Enabled. . . . . . . . : No
              DNS Suffix Search List. . . . . . : xxxxxxxxxxxx


              Ethernet adapter Local Area Connection:

              Connection-specific DNS Suffix . :
              Description . . . . . . . . . . . : Intel 21140-Based PCI Fast Ethernet Adapt
              er (Generic)
              Physical Address. . . . . . . . . : 00-03-FF-AD-8D-95
              DHCP Enabled. . . . . . . . . . . : No
              IP Address. . . . . . . . . . . . : 10.72.13.22
              Subnet Mask . . . . . . . . . . . : 255.255.255.240
              Default Gateway . . . . . . . . . : 10.72.1.1
              DNS Servers . . . . . . . . . . . : 10.72.13.9
              10.73.13.12


              Machine B:


              Windows IP Configuration

              Host Name . . . . . . . . . . . . : xxx
              Primary Dns Suffix . . . . . . . : xx
              Node Type . . . . . . . . . . . . : Unknown
              IP Routing Enabled. . . . . . . . : No
              WINS Proxy Enabled. . . . . . . . : No
              DNS Suffix Search List. . . . . . : xx
              xx
              xx

              Ethernet adapter Local Area Connection:

              Connection-specific DNS Suffix . :
              Description . . . . . . . . . . . : Intel 21140-Based PCI Fast Ethernet Adapt
              er (Generic)
              Physical Address. . . . . . . . . : 00-03-FF-19-98-CB
              DHCP Enabled. . . . . . . . . . . : No
              IP Address. . . . . . . . . . . . : 10.72.13.31
              Subnet Mask . . . . . . . . . . . : 255.255.240.0
              Default Gateway . . . . . . . . . : 10.72.1.1
              DNS Servers . . . . . . . . . . . : 10.72.13.9
              10.67.0.11

              Interesting thing with the tracerts - it seems that all outbound traffic is hitting the default gateway on both VMs, despite being on the same subnet. Even weirder - this actually seems to work for some destinations on the same subnet and not others...see the following:

              tracert 10.72.13.31

              Tracing route to "Machine A" [10.72.13.31]
              over a maximum of 30 hops:

              1 * * * Request timed out.
              2 * * * Request timed out.
              3 * * * Request timed out.
              4 * * * Request timed out.
              5 * * * Request timed out.
              6 * * * Request timed out.
              7 * * * Request timed out.
              8 * * * Request timed out.
              9 * * * Request timed out.
              10 * * * Request timed out.
              11 * * * Request timed out.
              12 * * * Request timed out.
              13 * * * Request timed out.
              14 * * * Request timed out.
              15 * * * Request timed out.
              16 * * * Request timed out.
              17 * * * Request timed out.
              18 * * * Request timed out.
              19 * * * Request timed out.
              20 * * * Request timed out.
              21 * * * Request timed out.
              22 * * * Request timed out.
              23 * * ^C
              N:\>tracert 10.72.13.9

              Tracing route to xx.xx.xx.xx [10.72.13.9]
              over a maximum of 30 hops:

              1 <1 ms <1 ms <1 ms 10.72.1.1
              2 <1 ms <1 ms <1 ms ausyd1dcm01.ap.media.global.loc [10.72.13.9]

              Trace complete.


              So, now I don't understand *2* things:
              1. Why the gateway is involved at all, and
              2. Why the gateway sometimes "works" and sometime doesn't???


              Steve.

              Comment


              • #8
                Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

                Before we go any further, I see a difference in the subnet masks of the two machines, at least in what you posted... Is it a typo?

                Sorin Solomon


                In order to succeed, your desire for success should be greater than your fear of failure.
                -

                Comment


                • #9
                  Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

                  many many thanks. subnet mask was wrong on one of the machines as you spotted.

                  cheers!

                  Comment


                  • #10
                    Re: Virtual Server 2005 R2 VMs can't see each other - different physical hosts

                    Ah yes, the old Vulcan logic has struck again.
                    1 1 was a racehorse.
                    2 2 was 1 2.
                    1 1 1 1 race 1 day,
                    2 2 1 1 2

                    Comment

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