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Guest can't see hosts network connection using QEMU-KVM

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I have the following setup:

Debian buster OS with KDE desktop

AMD-64 4 cpu processor

Host Debian Buster

Guest kubuntu 18.04

Virtual Machine QEMU

I followed the wiki instructions to set up a bridge between the two 
operating systems but can't get it to work. Not only does the guest 
networking not work but my setup kills the host's as well. My 
/etc/network/interfaces file is:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*
*______________________________________________*
# The loopback network interface
auto lo
iface lo inet loopback

#auto enp4s0
iface enp4s0 inet manual

auto br0
iface br0 inet dhcp
    pre-up ip tuntap add dev tap0 mode tap user ctech
    pre-up ip link set tap0 up
    bridge_ports all tap0
    bridge_stp off
    bridge_maxwait 0
    bridge_fd      0
    post-down ip link set tap0 down
    post-down ip tuntap del dev tap0 mode tap
*____________________________________________*

The host name is ctech.

I have reset the network, using /etc/init.d/networking restart, after 
each change.

I have looked for more documentation with no success. QEMU doesn't have 
a user forum that I can find.

Any help will be sincerely appreciated.

Gary R.

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Thread

Guest can't see hosts network connection using QEMU-KVM "Gary L. Roach" <garyroach719.lists@gmail.com> - 2020-03-27 01:30 +0100
  Re: Guest can't see hosts network connection using QEMU-KVM deloptes <deloptes@gmail.com> - 2020-03-27 08:50 +0100
    Re: Guest can't see hosts network connection using QEMU-KVM "Alexander V. Makartsev" <avbetev@gmail.com> - 2020-03-27 09:30 +0100
      Re: Guest can't see hosts network connection using QEMU-KVM deloptes <deloptes@gmail.com> - 2020-03-27 14:20 +0100
      Re: Guest can't see hosts network connection using QEMU-KVM Bob Weber <bobrweber@gmail.com> - 2020-03-27 14:30 +0100
        Re: Guest can't see hosts network connection using QEMU-KVM "Gary L. Roach" <garyroach719.lists@gmail.com> - 2020-03-27 19:30 +0100

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