setup/nuc-setup-wifi-forwarding at master · LTU-Actor/setup · GitHub

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ETH=$(ls /sys/class/net | grep e | head -n 1)
WIFI=$(ls /sys/class/net | grep w | head -n 1)

echo "Using ethernet interface '$ETH' and wifi interface '$WIFI'"

echo "Installing dhcpd server and iptables config reader"
sudo apt-get install isc-dhcp-server iptables-persistent

echo "Writing /etc/dhcp/dhcpd.conf"
cat <<EOF | sudo tee /etc/dhcp/dhcpd.conf > /dev/null
# ACTor dhcp server /etc/dhcp/dhcpd.conf
ddns-update-style none;
default-lease-time 600;
max-lease-time 7200;

subnet 192.168.0.0 netmask 255.255.0.0 {
 range 192.168.0.61 192.168.0.199;
 option routers 192.168.0.60;
 option domain-name-servers 1.1.1.1;
}
EOF

echo "Writing /etc/netplan/99-actor-static-ip.yaml"
cat <<EOF | sudo tee /etc/netplan/99-actor-static-ip.yaml > /dev/null
# ACTor static ip config
network:
  version: 2
  renderer: NetworkManager
  ethernets:
    $ETH:
      addresses:
        - 192.168.0.60/16
      nameservers:
        addresses: [1.1.1.1, 8.8.8.8, 4.4.4.4]
EOF

echo "Writing /etc/sysctl.d/99-ipv4-forward.conf"
cat <<EOF | sudo tee /etc/sysctl.d/99-ipv4-forward.conf > /dev/null
net.ipv4.ip_forward = 1
EOF

echo "Writing /etc/iptables/rules.v4"
cat <<EOF | sudo tee /etc/iptables/rules.v4 > /dev/null
*filter
:INPUT ACCEPT [2117:251017]
:FORWARD ACCEPT [3325:4355368]
:OUTPUT ACCEPT [1972:240413]
COMMIT
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o $WIFI -j MASQUERADE
COMMIT
EOF

echo "REBOOT BEFORE WIFI FORWARDING AND DHCP WILL WORK CORRECTLY. YOU WILL NEED TO RECONNECT TO THE WIFI AFTER LOGGING IN!"