I have on the host machine two network interfaces. One is lan and the other is a wlan. For libvirt I have created a nat network which is bound to the wlan. From the guest I can access other machines in the network host wlan is connected to. Also DNS lookup works. The problem is that there’s no connection to the internet at all, e.g. pinging something gives “Destination network unreachable”. This only happens when both network connection on the host are active. Running qemu/libvirt on OpenSuse Tumbleweed.

The nat network in question:

<network>
  <name>natToWlan</name>
  <uuid>a44c939c-e6bf-44d0-8f86-376056d418a4</uuid>
  <forward dev="wlp19s0f4u1u1" mode="nat">
    <nat>
      <port start="1024" end="65535"/>
    </nat>
    <interface dev="wlp19s0f4u1u1"/>
  </forward>
  <bridge name="virbr1" stp="on" delay="0"/>
  <mac address="52:54:00:1f:64:95"/>
  <ip address="192.168.100.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.100.128" end="192.168.100.254"/>
    </dhcp>
  </ip>
</network>
    • FrostyPolicy@suppo.fiOP
      1·
      1 month ago

      When the host routing table is like this:

      $route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.102.1   0.0.0.0         UG    600    0        0 wlp19s0f4u1u1
default         RT-AC86U-6D60   0.0.0.0         UG    20100  0        0 enp15s0

      the VM has internet connection. If the defaults are the other way around it doesn’t.