dhcp.sh

INTERNET_INTERFACE=wlp13s0
LOCAL_INTERFACE=enp15s0

LOCAL_INTERFACE_IP_BASE=192.168.155
LOCAL_INTERFACE_IP="${LOCAL_INTERFACE_IP_BASE}.1"
LOCAL_INTERFACE_MAC=$(cat /sys/class/net/${LOCAL_INTERFACE}/address)

ip link set up dev ${LOCAL_INTERFACE}
ip addr add "${LOCAL_INTERFACE_IP}"/24 dev ${LOCAL_INTERFACE}

mkdir data
cat <<EOF > data/dhcpd.conf
option domain-name-servers 8.8.8.8, 8.8.4.4;
option subnet-mask 255.255.255.0;
option routers ${LOCAL_INTERFACE_IP};

subnet ${LOCAL_INTERFACE_IP_BASE}.0 netmask 255.255.255.0 {
    range ${LOCAL_INTERFACE_IP_BASE}.3 ${LOCAL_INTERFACE_IP_BASE}.253;
}

host sister {
     hardware ethernet ${LOCAL_INTERFACE_MAC};
     ignore booting;
}

EOF

docker run -d --name dhcpd --init --net host -v "$PWD/data":/data networkboot/dhcpd ${LOCAL_INTERFACE}

sysctl -w net.ipv4.ip_forward=1
iptables -I FORWARD 1 -i ${INTERNET_INTERFACE} -o ${LOCAL_INTERFACE} -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 1 -i ${LOCAL_INTERFACE} -o ${INTERNET_INTERFACE} -j ACCEPT
iptables -t nat -I POSTROUTING 1 -s "${LOCAL_INTERFACE_IP_BASE}.0/24" -o ${INTERNET_INTERFACE} -j MASQUERADE
# sudo route del default gw 192.168.133.193
#iptables-save > /etc/iptables/iptables.rules
#systemctl enable iptables