####Networking for firecracker (i think)

#on the host machine


INTERFACE="ens18"
sudo ip link add name br0 type bridge
sudo ip addr add 172.20.0.1/24 dev br0
sudo ip link set dev br0 up
sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables --table nat --append POSTROUTING --out-interface ${INTERFACE} -j MASQUERADE
sudo iptables --insert FORWARD --in-interface br0 -j ACCEPT

sudo ip tuntap add dev tap0 mode tap
sudo brctl addif br0 tap0
sudo ifconfig tap0 up

#Inside the vm (if image isn't built with nfs support
ip addr add dev eth0 172.20.0.2/16 
ip route add default via 172.20.0.1 
echo "nameserver 8.8.8.8" > /etc/resolv.conf

if it is built with nfs support you supposedly can change the bootargs like so
"boot_args": "ro console=ttyS0 noapic reboot=k panic=1 pci=off nomodules random.trust_cpu=on ip=172.20.0.2::172.20.0.1:255.255.255.0::eth0:off"

#delete
You can delete interfaces like:

sudo ip link del br0