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Re: dhcp bridge for virtual machines using KVM

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On 9/22/20 5:54 PM, James Allsopp wrote:
>
>
> On Tue, 22 Sep 2020 at 19:47, Lucas Castro <lucas@gnuabordo.com.br 
> <mailto:lucas@gnuabordo.com.br>> wrote:
>
>
>     On 9/22/20 1:26 PM, James Allsopp wrote:
>     > Hi,
>     > I've got a computer that I'm running debian 10 on with KVM. The
>     > machine is connected to a OpenWRT router which provides DHCP and
>     DNS
>     > to the network, via a wifi link used for the host and an ethernet
>     > connection on eth1 used for a bridge
>
>     Is your OpenWRT router running in vm on the same host or somewhere
>     else
>     throughout physical network eth1?
>
>
> The OpenWRT is a completely separate device running at the end of the 
> cable connected to eth1. The Wireless is also connected to an AP on 
> that router. All of this is on the 192.168.1.* network.
>
>     >
>     > I've set this file up for the bridge in
>     /etc/network/interfaces.d/br0
>     > auto eth1
>     > auto br0
>     > iface br0 inet dhcp
>     > bridge_ports eth1
>     > bridge_fd 0
>     > bridge_stp off
>     >
>     > ifup br0 brought it up nicely and it got an IP address in the range
>     > I'd expect. So far so good. The only problem is now, I can't get
>     any
>     > of the VM's I create to use this network. When creating a VM using
>     > Virtual Machine Manager, it gives me the option to specify shared
>     > device name for the network source. One of these is for a network I
>     > already created in virsh;
>     >
>     > <network>
>     >   <name>host-bridge</name>
>     >   <forward mode="bridge"/>
>     >   <bridge name="br0"/>
>     > </network>
>
Try something like this ti get your vm settings.

virsh -c qemu:///system dumpxml ${GUEST_NAME} | egrep -A5 -i 
"network|bridge"


i.e.

virsh -c qemu:///system dumpxml Buster | egrep -A5 -i "network|bridge"
     <interface type='network'>
       <mac address='52:54:00:1b:07:7c'/>
       <source network='default' bridge='virbr0'/>
       <target dev='vnet0'/>
       <model type='virtio'/>
       <alias name='net0'/>
       <address type='pci' domain='0x0000' bus='0x01' slot='0x00' 
function='0x0'/>
     </interface>
     <interface type='bridge'>
       <mac address='52:54:00:7c:96:61'/>
       <source bridge='lxc-lan'/>
       <target dev='vnet1'/>
       <model type='virtio'/>
       <alias name='net1'/>
       <address type='pci' domain='0x0000' bus='0x07' slot='0x00' 
function='0x0'/>
     </interface>

>     >
>     > However, if I set the network to either 'host-bridge' or br0
>     directly,
>     > the route is never set and I can never get  a dhcp setting. I've
>     > checked ip_forward is set to 1.
>     >
>     > I'd just like to set it up this way, as it seems really
>     inefficient to
>     > have a dhcp and then use difficult to remember static IP's
>     everywhere.
>     >
>     > Thanks
>     > James
>     >
>     >
>     -- 
>     Lucas Castro
>
-- 
Lucas Castro

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dhcp bridge for virtual machines using KVM James Allsopp <jamesaallsopp@googlemail.com> - 2020-09-22 18:30 +0200
  Re: dhcp bridge for virtual machines using KVM Fabien Roucaute <fabien.roucaute@free.fr> - 2020-09-22 18:50 +0200
    Re: dhcp bridge for virtual machines using KVM Fabien Roucaute <fabien.roucaute@free.fr> - 2020-09-22 19:00 +0200
      Re: dhcp bridge for virtual machines using KVM James Allsopp <jamesaallsopp@googlemail.com> - 2020-09-22 23:00 +0200
        Re: dhcp bridge for virtual machines using KVM Fabien Roucaute <fabien.roucaute@free.fr> - 2020-09-23 07:30 +0200
          Re: dhcp bridge for virtual machines using KVM Fabien Roucaute <fabien.roucaute@free.fr> - 2020-09-23 15:20 +0200
            Re: dhcp bridge for virtual machines using KVM john doe <johndoe65534@mail.com> - 2020-09-23 15:50 +0200
          Re: dhcp bridge for virtual machines using KVM Lucas Castro <lucas@gnuabordo.com.br> - 2020-09-23 16:50 +0200
  Re: dhcp bridge for virtual machines using KVM Lucas Castro <lucas@gnuabordo.com.br> - 2020-09-22 20:50 +0200
    Re: dhcp bridge for virtual machines using KVM James Allsopp <jamesaallsopp@googlemail.com> - 2020-09-22 23:00 +0200
      Re: dhcp bridge for virtual machines using KVM Lucas Castro <lucas@gnuabordo.com.br> - 2020-09-22 23:40 +0200
        Re: dhcp bridge for virtual machines using KVM James Allsopp <jamesaallsopp@googlemail.com> - 2020-09-23 13:50 +0200

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