gns3-server/gns3server/compute/docker/resources/bin/udhcpc

#!/gns3/bin/busybox sh

SCRIPT="/gns3/etc/udhcpc/default.script"

if [ "$(cat "/proc/$PPID/comm" 2>/dev/null)" = ifup ]; then
	# remove "-n" argument
	for arg do
		shift
		[ "$arg" = "-n" ] || set -- "$@" "$arg"
	done
	# add default parameters
	set -- -t 3 -T 2 -A 1 -b "$@"
fi

exec /tmp/gns3/bin/udhcpc -s "$SCRIPT" "$@"