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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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No internet in virtual machine (suppo.fi)

submitted 5 months ago* (last edited 5 months ago) by [email protected] to c/[email protected]

7 comments fedilink hide all child comments

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>

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[–] [email protected] 1 points 5 months ago* (last edited 5 months ago)

This sounds reasonable. Curiously now that I tried again with both host lan & wlan active there was no problem. I have a hunch the routing depends on which interface networkmanger starts first.

$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
192.168.2.0     0.0.0.0         255.255.255.0   U     100    0        0 enp15s0
192.168.100.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr1
192.168.102.0   0.0.0.0         255.255.255.0   U     600    0        0 wlp19s0f4u1u1
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0_