<html><body bgcolor="#FFFFFF"><div>When you showed the output of brctl show earlier only eth0 showed up. Does the VM NIC showed up attached to br0 when the VM is running?</div><div><br></div><div>If so, then you can ping the VM from your host? That wouldn't involve the university switches so it would be a good first step before digging into packet dumping arp traffic...<br><br><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); ">Sent from my mobile phone</span></div><div><br>On Jul 16, 2011, at 4:58 PM, Trey Dockendorf <<a href="mailto:treydock@gmail.com">treydock@gmail.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><br><br><div class="gmail_quote">On Fri, Jul 15, 2011 at 6:24 PM, Emmanuel Noobadmin <span dir="ltr"><<a href="mailto:centos.admin@gmail.com"><a href="mailto:centos.admin@gmail.com">centos.admin@gmail.com</a></a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On 7/16/11, Trey Dockendorf <<a href="mailto:treydock@gmail.com"><a href="mailto:treydock@gmail.com">treydock@gmail.com</a></a>> wrote:<br>
> I have successfully bridged one of the server's NICs to br0, and I can ping<br>
> the IP remotely that is assigned to br0, but none of the VMs that worked in<br>
> 5.6's KVM are able to access the network. Please let me know what<br>
> information would be useful to troubleshoot this.<br>
<br>
</div>Could you try creating a new VM using the GUI tool, then check if the<br>
networking works from it?<br>
<br>
I was having problems with KVM and part of the troubleshooting process<br>
got me to try it on SL6, which finally led me to discover that the<br>
command line tool generated XML doesn't work as well as the GUI tool<br>
for some reason. So there's the possibility that it could be that the<br>
definitions created through virsh in 5.6 has the same issues in CentOS<br>
6.<br>
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</div></div></blockquote></div><br><div><br></div><div>I did try another VM (CentOS 6) via virt-manager with the same results. However I setup a test server at home, and am able to get both bridging and NAT to work so this may be an issue with the network on my server. It's a University network and their switches tend to play havoc with virtual servers even though I've been assured enough MAC addresses have been allowed on my port. </div>
<div><br></div><div>How does one troubleshoot or provide debug information on a correctly or incorrectly functioning network bridge? As I contact my University's helpdesk I'd like to be able to point out the fault is not with my KVM server.</div>
<div><br></div><div>Thanks</div><div>- Trey</div>
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