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network:
    ethernets:
        enp2s0:
            dhcp4: true
        enp3s0:
            addresses:
            - 10.0.0.0/24
    version: 2

grep DEFAULT_FORWARD_POLICY /etc/default/ufw
sed -i 's/DEFAULT_FORWARD_POLICY="DROP"/DEFAULT_FORWARD_POLICY="ACCEPT"/' /etc/default/ufw
grep DEFAULT_FORWARD_POLICY /etc/default/ufw

grep 'net.ipv4.ip_forward=1' /etc/sysctl.conf
sed -i 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/' /etc/sysctl.conf
grep 'net.ipv4.ip_forward=1' /etc/sysctl.conf

#
# rules.before
*nat
:POSTROUTING ACCEPT [0:0]

# Forward traffic through eth0 - Change to match you out-interface
-A POSTROUTING -s 10.0.0.0/24 -o enp2s0 -j MASQUERADE

# don't delete the 'COMMIT' line or these nat table rules won't
# be processed
COMMIT
#
# Rules that should be run before the ufw command line added rules. Custom
# rules should be added to one of these chains:
#   ufw-before-input
#   ufw-before-output
#   ufw-before-forward
#

# Don't delete these required lines, otherwise there will be errors
*filter
:ufw-before-input - [0:0]