diff --git a/dyndns-update.py b/dyndns-update.py
index f11bd00..991ceb1 100755
--- a/dyndns-update.py
+++ b/dyndns-update.py
@@ -2,11 +2,13 @@
 
 ## imports
 import json
-import ovh
-import requests
-import os, sys
 import logging
 import logging.handlers
+import os, sys
+import ovh
+import requests
+import subprocess
+import yaml
 from dotenv import load_dotenv
 
 my_logger = logging.getLogger('MyLogger')
@@ -32,6 +34,9 @@ client = ovh.Client(
 
 TMPFILE = '/tmp/lastIP'
 
+WEBRTCCONFIGFILE = `/etc/bigbluebutton/bbb-webrtc-sfu/production.yml`
+# WEBRTCCONFIGFILE = 'test.yml'
+
 def get_ip():
     r = requests.get('http://ipinfo.io')
     return (r.json()['ip'])
@@ -52,18 +57,26 @@ def set_record(zone, subdomain, ip):
         exit()
 
     result = client.post('/domain/zone/' + zone + '/refresh')
-    return result 
+    return result
+
+def read_config_file():
+    with open(WEBRTCCONFIGFILE,'r') as file:
+        webrtc_config = yaml.safe_load(file)
+    return webrtc_config
+
+def write_config_file(ip):
+    webrtc_config['mediasoup']['webrtc']['listenIps'][0]['announcedIp']=ip
+    webrtc_config['mediasoup']['plainRtp']['listenIp']['announcedIp']=ip
+    webrtc_config['freeswitch']['ip']=ip
+
+    with open(WEBRTCCONFIGFILE, 'w') as file:
+        yaml.dump(webrtc_config, file)
 
 
 if len(sys.argv) > 2:
-    if os.path.exists(TMPFILE):
-        with open(TMPFILE) as file:
-            try:
-                lastIP=file.read()
-            except:
-                my_logger.critical('error reading ' + TMPFILE)
-    else:
-        lastIP = ''
+    webrtc_config = read_config_file()
+
+    lastIP = webrtc_config['freeswitch']['ip']
 
     currentIP = get_ip()
 
@@ -71,8 +84,12 @@ if len(sys.argv) > 2:
         my_logger.debug ('IP has not changed since last call')
         exit()
 
-
     if (set_record  (sys.argv[1], sys.argv[2], currentIP) == None ):
+        write_config_file(currentIP)
+
+        subprocess.run(["ip","a","del",lastIP + '/32',"dev","lo"])
+        subprocess.run(["ip","a","add",currentIP,"dev","lo"])
+
         my_logger.debug('IP of ' + sys.argv[2] + '.' + sys.argv[1] + ' successfully changed to ' + currentIP)
     else:
         my_logger.critical('Couldn\'t change IP')
diff --git a/readme.md b/readme.md
index 6df038c..c769c13 100644
--- a/readme.md
+++ b/readme.md
@@ -1,8 +1,10 @@
-# Update DNS to current IP
+# Configures BBB for DYNDNS
 
-Simple dyndns for OVH API.  
+Changes domain name with OVH API.  Updates an A record to the current IP.  
 
-Updates an A record to the current IP.
+Updates `/etc/bigbluebutton/bbb-webrtc-sfu/production.yml` to current IP.  
+
+Updates loopback device with current IP.
 
 
 ## requirements ubuntu
@@ -18,18 +20,22 @@ $ pip install -r requirements.txt
 
 and edit `.env` with credentials from https://www.ovh.com/auth/api/createToken
 
-## run 
+## run
 
 `dyndns-update ZONE SUBDOMAIN`
 
 
 ## install
 
-Install as user cronjob like
+For changing the loopback device IP, this needs root rights.  
 
-`*/5 * * * * cd /home/user/ovh-dyndns ; ./dyndns-update.py ZONE SUBDOMAIN`
+```
+cd /root
+git clone git@git.gugelfrei.de:bbb/dyndns-update.git   
+```
 
-with
+Install as user cronjob like
 
-`$ crontab -e`
+`*/5 * * * * cd /root/dyndns-update ; ./dyndns-update.py ZONE SUBDOMAIN`
 
+to `/etc/cron.d/bbb`
diff --git a/test.yml b/test.yml
new file mode 100644
index 0000000..2191aa5
--- /dev/null
+++ b/test.yml
@@ -0,0 +1,17 @@
+freeswitch:
+  ip: 87.142.106.77
+  sip_ip: 127.0.0.1
+kurento:
+- ip: 192.168.2.47
+  url: ws://127.0.0.1:8888/kurento
+mediasoup:
+  plainRtp:
+    listenIp:
+      announcedIp: 87.142.106.77
+      ip: 0.0.0.0
+  webrtc:
+    listenIps:
+    - announcedIp: 87.142.106.77
+      ip: 0.0.0.0
+    - announcedIp: 192.168.2.47
+      ip: 0.0.0.0