[SASAG] Host and VM communication

Christopher Smith candasmith at gmail.com
Tue Mar 1 13:18:12 PST 2011


Good thoughts; yes I've reverified that the MAC addresses are completely
unique on the host and the VM, the other hosts on the network and the other
VMs. We've also verified that our switch is seeing unique MAC addresses.

Regarding ping:
Successful two-way ping: Host1 - VM1
Successful two-way ping: Host1 - Host2
Unsuccessful two-way ping: Host2 - VM1

On Mon, Feb 28, 2011 at 6:41 PM, Tres Wong-Godfrey <tres at apollonian.net>wrote:

>
> The fact that this is unique behavior for this host seems to indicate some
> kind of collision between two systems attempting to use the same hardware
> address.
>
> I know you've already said the mac addresses were verified correct, but...
>
> You might double check that the mac addresses are different between the two
> systems...
>
> Also, is it possible that you're running another VM on the host with the
> same mac addr?
>
> Another possibility is that the mac addr has been bound to another
> interface on the machine?
>
> ________________________________________________________________
> Can the host ping it's VM and visa versa? i.e. Host1 <-> VM1 ; Host2 <->
> VM2
> (Assuming that they are on the same subnet.)
> If they can't it could be a problem with the way the VM's interface is
> configured.
> --
> Perfection is just a word I use occasionally with mustard.
> --Atom Powers--
>
>
> On Feb 28, 2011, at 2:42 PM, Christopher Smith wrote:
>
> > Thank you for the responses; here's what I got.
> >       • Firewalls are off for the time being
> >       • Unable to connect to either machine over telnet (to and from)
> >       • Network Setup
> >               • We use Windows Server 2008 R2 Hyper-V and System Center
> Virtual Machine Manager
> >               • Host is 10.10.10.10
> >               • VM is 10.10.10.101
> >               • Host1 (1 physical NIC) and VM2 are connected through one
> switch (Cisco 3750)
> >               • A second host (also 1 physical NIC) is connected to that
> same switch
> >               • The Hosts are on the same subnet and switch and can ping
> each other
> > Ping Results using cmd.exe and a packet sniffer (this gets interesting)
> >
> > Ping from VM to Host
> > cmd.exe - no reply
> > VM Sniffer - Only outgoing packets shown
> > Host Sniffer - No packets shown
> >
> > Ping Host to VM
> > cmd.exe - no reply
> > VM Sniffer - Transmit and receive shown
> > Host Sniffer - No transmit or receive shown
> >
> > Thanks again!
> >
> > On Mon, Feb 28, 2011 at 11:35 AM, Bryan Stenson <bryan.stenson at gmail.com>
> wrote:
> > check firewalls on both hosts and vms...
> >
> > can you connect via tcp (telnet, http) to/from either host?
> >
> > On Mon, 2011-02-28 at 11:30 -0800, Christopher Smith wrote:
> > > Hello All,
> > > We're seeing an interesting issue with one of our Virtual Machines and
> > > Hosts on our network. Here's the setup:
> > >
> > >
> > > Virtual Machine Host: Host1
> > >         Virtual Machine: VM1
> > > Virtual Machine Host: Host2
> > >         Virtual Machine: VM2
> > >
> > >
> > > Host1 cannot ping VM2 and VM2 cannot ping Host1
> > >       * All MAC addresses were verified to be correct
> > >       * ARP data was correct
> > >       * DNS also resolves correct IPs
> > > Any help or direction is appreciated!
> > >
> > >
> > > Christopher
> > > _______________________________________________
> > > Members mailing list
> > > Members at lists.sasag.org
> > > http://lists.sasag.org/mailman/listinfo/members
> >
> >
> >
> > _______________________________________________
> > Members mailing list
> > Members at lists.sasag.org
> > http://lists.sasag.org/mailman/listinfo/members
>
>
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