All networking within oVirt seems fine.  I can ping devices on other networks, I'm able to use a squid proxy on the same network with no issues.  I'm able to use Terminal Services from another VM in oVirt.  One oddity is when I first boot, I'm able to hit Google and search for a Dog.  On my 2nd search it starts to timeout.
  
All and all ip networking seems to be configured well.  The DG lives outside of oVirt and I'm always able to ping it; even increasing the packet size.  

MTU size is 1500 and matches the VLAN MTU in oVirt; the bond0 is set to set to an 9000 MTU. 
EM1 and EM2 are in bond0 and show no framing errors.  

On Wed, Nov 25, 2015 at 1:30 AM, Yaniv Kaul <ykaul@redhat.com> wrote:
On Tue, Nov 24, 2015 at 11:17 PM, Matt Wells <matt.wells@mosaic451.com> wrote:
Hi all, I have a question about Windows VMs and a networking issue I'm having.  

Here's the setup - 
* oVirt - 3.5.1.1-1 
* Hypervisors are CentOS 6.7 box with 2 NICs in bond0 'mode=4 miimon=100 lacp_rate=1'
* On bond0 I have a few networks using vlan tagging.  
* Networks are 5,10,15,20 - All on an external switch

Network 15 has a Windows 2012 R2 server and a CentOS 6.7 server on it. 
The rest of the networks have a few linux.

Every linux box on every network is happy.  However any and all Windows boxes I bring online are incapable of patching or hitting the web.  I pointed the Windows box to the linux box next to it as a proxy (after installing squid on it)  When I do that the Windows box has no issues at all; it's only when he's attempting to leave on his own.  

On my firewall I put in a 'permit any any' on the M$ box IP however all I see is tcp resets in PCAPs, 

Can you verify basic IP networking is working correctly for those VMs?
For example, we've established that they can get to the Linux VMs - how? Are they on the same subnet? Or do they go through their default gateway? Without knowing the IP topology, if the Linux machines were on the same subnet as the Windows one, and the Windows machine fail to get to their default gateway for some reason, this may perfectly explain the issue.
Y.
 

I've been playing with for some time but can't seem to find the issue.  It would be one thing if everything on the 15 was bad but the linux box on the network is fine. Here's the rub, I'm 99.999% sure this used to work.  gggrrr...

Any assistance anyone can offer would be amazingly appreciated.  

Thank you for taking the time to read this.  


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