If you are Sure that you have check The NAT option and used the configuration you mentioned
Please give me the result of this
virsh net-list --all
If you can see natbr3 or similar not active Please run this command
virsh net-start natbr3
Change natbr3 with your NAT interface
after please make sure you made the bridge configration as the following
nano /etc/sysconfig/network-scripts/ifcfg-viifbr0
it is should look like this
Code
DEVICE=viifbr0
TYPE=Bridge
BOOTPROTO=static
IPADDR=XXX.XXX.XXX.XXX
GATEWAY=XXX.XXX.XXX.XXX
ONBOOT=yes
IPV4_FAILURE_FATAL=no
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_PRIVACY=no
DNS1=213.133.98.98
DNS2=213.133.99.99
DNS3=213.133.100.100
and make backup from your device if your main device is enp35s0 run this command
cp ifcfg-enp35s0 ifcfg-enp35s0.bak
if your main device is eth0 run this command
cp ifcfg-eth0 ifcfg-eth0.bak
after you have to edit you main interface device enp35s0 to be like this
Code NAME=enp35s0
DEVICE=enp35s0
UUID=XXXXXXXXXXXXXXXXXXXXXXXXXX
IPV6INIT=yes
ONBOOT=yes
BRIDGE=viifbr0
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