added dhclient update hook

Add this file to /etc/dhcp/dhclient-exit-hooks.d/nsupdate to update your dns autmatically when you get a new DHCP/IP lease from your ISP

bash/dhclient-exit-hook-nsupdate.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+NS=/usr/local/bin/nsupdate.sh
+key=/etc/bind/dhcp.key
+zone=0l.de
+host=wg.0l.de
+server=127.0.0.1
+
+case $reason in
+        BOUND|RENEW|REBIND|TIMEOUT)
+                $NS update -d $new_ip_address -k $key -z $zone -n $server -i $interface $host ;;
+        RELEASE)
+                $NS delete -d $old_ip_address -k $key -z $zone -n $server $host ;;
+esac