No connection to libvirt networks

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1

Hi everyone!
I am using virt-manager to create some VMs and recently I noticed that the VM’s can’t access the internet and I can’t access VM’s from the host.
I have tried disabling firewalls, using both linux and windows as guests and adding entries to iptables manually.

The VMs do get IPs using DHCP.

Here are some configurations:

<network>
  <name>default</name>
  <uuid>a1177501-4158-43ad-b2b3-80a11699600e</uuid>
  <forward mode="nat">
    <nat>
      <port start="1024" end="65535"/>
    </nat>
  </forward>
  <bridge name="virbr0" stp="on" delay="0"/>
  <mac address="52:54:00:5b:d4:08"/>
  <ip address="192.168.122.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.122.3" end="192.168.122.254"/>
    </dhcp>
  </ip>
</network>

<interface type="network">
  <mac address="52:54:00:50:6b:9f"/>
  <source network="default"/>
  <model type="virtio"/>
  <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>

Thank you in advance!

4

Some users reported a similar issue a while ago, presumably caused by a conflict with the Docker specific firewall settings.

5

Still doesn’t work. I do not have docker installed, and podman isn’t used.
I did try disabling firewalld as I said. Idk what changed.

6

Do not disable firewall since libvirt relies on it.
Note that some VPNs, even inactive, can block traffic forwarding.

1 Like
7

Yes I already found that it was tailscale, thank you!

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