B.12. Guest is Unable to Start with Error: warning: could not open /dev/net/tun

Procedure B.4. Reconfiguring the host system to use the generic ethernet interface

1. Set SELinux to permissive by configuring SELINUX=permissive in /etc/selinux/config:

   # This file controls the state of SELinux on the system.
   # SELINUX= can take one of these three values:
   #       enforcing - SELinux security policy is enforced.
   #       permissive - SELinux prints warnings instead of enforcing.
   #       disabled - No SELinux policy is loaded.
   SELINUX=permissive
   # SELINUXTYPE= can take one of these two values:
   #       targeted - Targeted processes are protected,
   #       mls - Multi Level Security protection.
   SELINUXTYPE=targeted

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2. From a root shell, run the command setenforce permissive.
3. In /etc/libvirt/qemu.conf add or edit the following lines:

   clear_emulator_capabilities = 0

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   user = "root"

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   group = "root"

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   cgroup_device_acl = [
           "/dev/null", "/dev/full", "/dev/zero",
           "/dev/random", "/dev/urandom",
           "/dev/ptmx", "/dev/kvm", "/dev/kqemu",
   	"/dev/rtc", "/dev/hpet", "/dev/net/tun",

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4. Restart libvirtd.