[libvirt-users] point-to-point connection between vm and host

[Jorge Somavilla]

On Wed, Apr 13, 2011 at 15:03,  <paul.worner at thomsonreuters.com> wrote:
> Hi Jorge,

Hi! thanks for the reply Paul,

> I am doing it by creating a bridge per vm.  I am not sure this is the
> best approach.  Hopefully, someone has a cleaner approach.

it is a good solution if nothing better comes up, i was thinking maybe
there is a cleaner way as you say though, if not i will most
definitely follow your lead, thank you!



> I did need to add forward mode "route", since the vm's network is
> independent of the host's network(s) and I am routing.
>
> <network>
>  <name>netdom4</name>
>  <forward mode="route"/>
>  <bridge name="virbr%d" stp="off" delay="0"/>
>  <ip address="10.0.0.1" netmask="255.255.255.252">
>  </ip>
> </network>
>
> If you are not routing, you can set this mode to "nat" so the vm will
> get sourced from host's address.  I haven't tried this, but I would
> assume the iptables nat rules are created automatically.
>
>  <forward mode="nat"/>
>
> Hope this helps,
> Paul
>
>
> -----Original Message-----
> From: libvirt-users-bounces at redhat.com
> [mailto:libvirt-users-bounces at redhat.com] On Behalf Of Jorge Somavilla
> Sent: Wednesday, April 13, 2011 7:29 AM
> To: libvirt-users at redhat.com
> Subject: [libvirt-users] point-to-point connection between vm and host
>
> Hi! hopefully someone can give me a hint with this:
>
>
> I need to create a vm with a point-to-point connection to the host
> using a /30 subnet. Right now i have this in the vm's xml for libvirt:
>
> <interface type="network" name="eth0" onboot="yes">
>   <source network="default"/>
>   <mac address="02:fd:00:00:01:00"/>
> </interface>
>
>
> Which brings up an interface in the vm that is configured later by a a
> daemon, getting to this:
>
> vnx at r2:~$ ifconfig eth0
> eth0     Link encap:Ethernet  HWaddr 02:fd:00:00:01:00
>          inet addr:10.250.0.2  Bcast:10.250.0.3  Mask:255.255.255.252
>
>
> While in the host the other interface is created:
>
> root at tau:/home/jorge/workspace/vnx# ifconfig r2-e0
> r2-e0     Link encap:Ethernet  HWaddr 0a:81:b6:3c:24:15
>          inet addr:10.250.0.1  Bcast:10.250.0.3  Mask:255.255.255.252
>
>
> However there is no connectivity between them, probably because of
> some mistake in the <interface> tag, perhaps a wrong 'type' attribute,
> but i haven't found out yet. I wouldn't want to create a bridge and
> connect both interfaces (vm's and host's) to the bridge, but to have
> this ptp, if possible. How would i go about doing that?
>
> thanks!
> Jorge
>
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