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

[paul.worner at thomsonreuters.com]

Hi Jorge,

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.

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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