It sounds like what you want is to bridge the host NIC to the container. In that case, the first thing you need to do is create a bridge. Do this by first ensuring bridge-utils is installed on the system, then open /etc/networking/interfaces for editing and change this:
auto eth0
iface eth0 inet dhcp
to this:
auto br0
iface br0 inet dhcp
bridge-interfaces eth0
bridge-ports eth0
up ifconfig eth0 up
iface eth0 inet manual
If your NIC is not named eth0, you should replace eth0 with whatever your NIC is named (mine is named enp5s0). Once you've made the change, you can start the bridge by issuing the command
sudo ifup br0
Assuming all went well, you should maintain internet access and even your ssh session should stay online during the process. I recommend you have physical access to the host because messing up the above steps could block the host from internet access. You can verify your setup is correct by running ifconfig and checking that br0 has an assigned IP address while eth0 does not.
Once that's all set up, open up /etc/lxc/default.conf and change
lxc.network.link = lxcbr0
to
lxc.network.link = br0
And that's it. Any containers that you launch will automatically bridge to eth0 and will effectively exist on the same LAN as the host. At this point, you can install ssh if it's not already and ssh into the container using its newly assigned IP address.
"Converting eth0 to br0 and getting all your LXC or LXD onto your LAN"