Dear Peter, Thanks for your reply. I was so occupied with troubleshooting that I forgot to mention the OS & Xen version :) My CentOS version is CentOS release 5.7 (Final) Linux 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:06:34 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux and Xen v3.0. I tried creating bridges the same way you did and succedded. I also tried doing the same via ifcfg scripts, and it also worked. I have no problem with creating bridges and connecting them with physical ifaces, but I can't start my VM's (most of the time one VM start but the other one hangs while trying to initalize eth2 that is connected to my second (non default - xenbr1) bridge)). The only diference between your config and mine is that I have vifname-s listed (example below): vif = [ "mac=00:16:36:72:35:e5,bridge=xenbr0,script=vif-bridge,vifname=vif4.0", "mac=00:16:3e:57:de:0d,bridge=xenbr1,script=vif-bridge, vifname=vif4.1" ] I'm not saying that this could be the problem, but since I'm slowly running out of ideas - it's a longshot :) So, to sum it all up - I can create bridges properly, but my VM's hang when they try to bring up vifaces connected to the xenbr1. Also, I have no problem with having only one bridge active - problem appears when I have multiple bridges. Br, Matija -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20111118/2a75ed85/attachment-0006.html>