How to setup network for guest OS?

Question

linux

Good afternoon. Please help.
There is a host with a guest virtual machine.
The host has internet access through br0 and access to the virtual machine through virbr0. IP of the virtual machine 192.168.122.10
How to configure iptables on the host so that the virtual machine goes online?

Answer 1

On the host:

echo 1 > /proc/sys/net/ipv4/ip_forward
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf   
iptables -t nat -A POSTROUTING -s 192.168.122.0/24 -j MASQUERADE