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On 08/27/2015 08:56 PM, Spanky Horawitz
wrote:
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 https://help.ubuntu.com/community/KVM/Networking
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.
-----Original Message-----
From: Laine Stump <laine@xxxxxxxxx>
To: libvirt-users@xxxxxxxxxx
Cc: shorawitz@xxxxxxxxx
Subject: Re: Isolated networks &&
test lab
Date: Thu, 27 Aug 2015 20:52:04 -0400
On 08/27/2015 08:25 PM, Spanky Horawitz wrote:
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.)
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)
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