Need help in configuring VLAN with internet access inside lxd container

Hi Here is my configuration


auto lo
iface lo inet loopback
iface lo inet6 loopback

auto vmbr0
iface vmbr0 inet static
   address     88.99.x.x
   gateway     88.99.x.x
   bridge_ports eth0
   bridge_stp off
   bridge_fd 1
   bridge_hello 2
   bridge_maxage 12
   up route add -net 88.99.x.x netmask gw 88.99.x.x

auto eth0.4000
iface eth0.4000 inet static
   vlan-raw-device eth0
   mtu 1400

My LXD host has a public IP 88.99.x.x
LXD version 3.7

What other configuration do I need to make to have IP 19.168.1.x inside the container and be able to have internet access, host access, and other lxd hosts access.

I have 9 other lxd hosts with lots of containers who are unable to communicate with containers in other hosts

I really need your expert help.