<html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head> <body text="#000000" bgcolor="#FFFFFF"> <div class="moz-cite-prefix">On 08/27/2015 08:56 PM, Spanky Horawitz wrote: </div> <blockquote cite="mid:1440723418.10707.43.camel@psdchristensen" type="cite"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="GENERATOR" content="GtkHTML/4.6.6"> Thanks again! Can you tell me the difference in setting things up that way as opposed to updating (in Ubuntu) /etc/network/interfaces and adding physical br(idge) interfaces? On my other test box, I setup networks the way you describe from <a moz-do-not-send="true" href="https://help.ubuntu.com/community/KVM/Networking">https://help.ubuntu.com/community/KVM/Networking</a> </blockquote> The main difference between libvirt's bridges and a bridge setup as described on that page is that bridges created by libvirt will never have a physical ethernet device directly attached, so any communication to the outside from interfaces connected to a libvirt-created bridge will need to be routed at L3 by an IP stack on "something" connected directly to the bridge; that could be another guest which has multiple interfaces (as you're setting up) or it could be the host itself (when you configure an IP address on a bridge, that effectively plugs the host's IP stack into a port on the bridge). It's possible to configure bridge interfaces with no directly attached ethernet outside the scope of libvirt in /etc/network/interfaces - just skip the "bridge_ports" line. The effect is the same, just depends on where you want your config. <blockquote cite="mid:1440723418.10707.43.camel@psdchristensen" type="cite"> -----Original Message----- From: Laine Stump <<a moz-do-not-send="true" href="mailto:Laine%20Stump%20%3claine@laine.org%3e">laine@laine.org</a>> To: <a moz-do-not-send="true" href="mailto:libvirt-users@redhat.com">libvirt-users@redhat.com</a> Cc: <a moz-do-not-send="true" href="mailto:shorawitz@gmail.com">shorawitz@gmail.com</a> Subject: Re: [libvirt-users] Isolated networks && test lab Date: Thu, 27 Aug 2015 20:52:04 -0400 On 08/27/2015 08:25 PM, Spanky Horawitz wrote: <blockquote type="CITE"> Sorry, just realized there is a VMmanager app too (free version seem to only have support for Debian 7 though.) I am using the Virtual Machine Manager GUI (virt-manager.) </blockquote> virt-manager is what I'm talking about (don't know what you mean by "VMmanager"). Probably the dialogs have changed - mine is v1.2.1. 0.9.5 sounds a bit old, you should see if there is a backport of a newer version somewhere for whatever distro you're running. Alternately, it is dirt simple to create a new network that has no IP address associated with it. Just do this: 1) create a file with these contents: <network> <name>mynetname</name> </network> 2) "virsh net-define filename.xml" (where filename.xml is the file containing the above XML) 3) "virsh net-autostart mynetname; virsh net-start mynetname" (all these run as root) <fieldset class="mimeAttachmentHeader"></fieldset> <pre wrap="">_______________________________________________ libvirt-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:libvirt-users@redhat.com">libvirt-users@redhat.com</a> <a class="moz-txt-link-freetext" href="https://www.redhat.com/mailman/listinfo/libvirt-users">https://www.redhat.com/mailman/listinfo/libvirt-users</a></pre> </blockquote> </body> </html>