Hi,

I read this content which contains a lot of usefull info. But there are still some issues and I hope someone can help me out.

https://wiki.unraid.net/Manual/VM_Management#Configure_a_Network_Bridge

Start point: I want to create a virtual network for testing vm´s that should be completely isolated from the host and from other vm´s in br0 / virbr0 / any vlan´s / dockers and from any host's network file sharing protocols running. But it should connect to internet.

It should still need to connect to internet. I basically want a test-environment.

 

I haven´t changed anything at the router.

 

Following Bastl´s @bastl approach helped by @ken-ji I managed to create a new virtual nic (virbr1 called lab-network). The only thing I am not able to reproduce is to get access to internet.

 

lab-network.xml:

<network>
  <name>lab-network</name>
  <bridge name="virbr1"/>
  <forward mode="nat"/>
  <ip address="192.168.122.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.122.2" end="192.168.122.254"/>
    </dhcp>
  </ip>
  <ip family="ipv6" address="2001:db8:ca2:2::1" prefix="64"/>
</network>

 

virsh # net-list
 Name          State    Autostart   Persistent
------------------------------------------------
 default       active   yes         yes
 lab-network   active   yes         yes

 

Default (does provide internet access):

virsh # net-dumpxml default
<network>
  <name>default</name>
  <uuid>db01278f-bf88-44da-43d4-e0b4eb46f456</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:72:08:e9'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254'/>
    </dhcp>
  </ip>
</network>

 

Lab-network:

<network ipv6='yes'>
  <name>lab-network</name>
  <uuid>e00fd28e-5bfc-4e83-8163-0c17e34562ae</uuid>
  <bridge name='virbr1' stp='on' delay='0'/>
  <mac address='52:54:00:05:a0:07'/>
</network>

 

What I am missing?

 

Rgds

 

I replay to myself as I think it is easier this way to explain what I realised. It may make more sense after that.

 

I attached the content of lab-network.xml (corresponds to virbr1 I am trying to set up) which contains this error: the IP network 192.168.122.0 I posted is the same as virbr0 (the one that is already provided by default by Unraid for virbr0).

 

I then changed it to a new not used network: 192.168.133.0 and this is what I get after asking virsh # net-dumpxml lab-network:

<network ipv6='yes'>
  <name>lab-network</name>
  <uuid>e00fd28e-5bfc-4e83-8163-0c17e34562ae</uuid>
  <bridge name='virbr1' stp='on' delay='0'/>
  <mac address='52:54:00:05:a0:07'/>
</network>

 

Still virbr1 is not up and running as virbr0. I pinged 192.168.133.1 from host and there is no answer.

 

So I thought maybe someone can tell me how virbr0 is defined and where is the config file stored ... and from there I could solve my problem with virbr1.

Edited November 28, 20223 yr by luca2