Hyper-V vm's are unable to talk to each other, but outside world O

[DP]

Hi,
We've recently set up a new Hyper-V (v6.0.6001.17101) on Win2008 SP1. There
are 3 VM's set up on the server, and they seem to be running fine. However,
the VM's cannot talk to each other or the VM host server, and vice versa (via
'ping', 'tracert', etc). They can access other servers in our network just
fine, and v.v.

The physical VM server has 2 network ports, but only one is active. We have
one virtual NIC going to this physical port, and all the VM's are using it.

I believe the issue is with how the network connections are set up on the VM
host server, but I'm not sure how they should be set. The phyiscal network
interface was created before we config'd Hyper-V, and the virtual network
interfaces were created automatically when installing Hyper-V.

Any suggestions would be much appreciated. Thanks.

[Bill Grant]

"DP" <D...@discussions.microsoft.com> wrote in message
news:1ABF69AD-6588-4897...@microsoft.com...

If the virtual machines can all see the machines on the physical LAN,
they must be in the same network and IP subnet as each other and the
physical machines. The most likely cause is firewall settings on the vms
and the host rather than networking problems.

[DP]

Bill,
Thanks for the reply. We figured out the culprit and you were correct. The
problem was due to our Symantec Endpoint Protection installation (it has
built-in firewall features). We've yet to narrow down what exactly in
Symantec caused it, but once we uninstalled it, the issue was gone. Thanks
again.

"Bill Grant" wrote:

> .
>

[Geoff N. Hiten]

I find must such problems begin somewhere near the word "Symantec".

--
Geoff N. Hiten
Principal SQL Infrastructure Consultant
Microsoft SQL Server MVP

"DP" <D...@discussions.microsoft.com> wrote in message

news:CECE7A63-A6AC-4E04...@microsoft.com...

[GS]

We have SEP installed in the w2008 and the hyperv guest. no problem
whatsoever
nothing went wrong with other test hyperv installation either. The only
problem was Ms's new firewall sometimes kicked in causing havoc despite
earlier disable attempt

we are using SEP v11MR5. it "works out of the box", We did go aggressive on
the network protection we did turn on mac spoofing. also in our environment
some servers are consider trusted for certain tcp protocols though not
trusted for autoprotection between machines of any kind

"DP" <D...@discussions.microsoft.com> wrote in message

news:CECE7A63-A6AC-4E04...@microsoft.com...