nat.conf.stop

INTERFACE="$1"
IPV4_ROUTE_1=$(awk -F'=' '/IPV4_ROUTE_1=/{gsub(/"/, "", $2);print $2}' nat.conf)

kill $(cat /var/run/dnsmasq_zeth.pid)
sysctl -w net.ipv4.ip_forward=0
iptables -t nat -D POSTROUTING -j MASQUERADE -s $IPV4_ROUTE_1