diff --git a/files/bataddif.sh.j2 b/files/bataddif.sh.j2
index e0fc221..42328e5 100644
--- a/files/bataddif.sh.j2
+++ b/files/bataddif.sh.j2
@@ -1,30 +1,8 @@
 #!/bin/bash
 INTERFACE="$3"
-#MAC="$8"
-#BLACKLISTFILE=/opt/freifunk/blockliste.txt
-batctl=/usr/local/sbin/batctl
+MAC="$8"
+brctl=/sbin/brctl
 
-#if [ -f /opt/freifunk/blockliste.txt ] 
-
-#if [ -f $BLACKLISTFILE ]
-#  then
-#    BLOCKLISTE=$(cat /opt/freifunk/blockliste.txt)
-#  else
-#    touch=$BLOCKLISTE
-#fi 
-
-#for i in $BLOCKLISTE;
-#do
-#    if [[ $i == $MAC ]]; then
-#      exit 1
-#    fi
-#done
-
-#ip link set address {{ sn_mesh_MAC }} dev $INTERFACE
-#ifconfig $INTERFACE hw ether {{ sn_mesh_MAC }}
 /bin/ip link set dev $INTERFACE up mtu 1312
-#/sbin/sysctl net.ipv4.conf.$INTERFACE.rp_filter=0
-
-$batctl if add $INTERFACE
-
-echo "enabled" > /sys/devices/virtual/net/$INTERFACE/batman_adv/no_rebroadcast
+#echo "enabled" > /sys/devices/virtual/net/$INTERFACE/batman_adv/no_rebroadcast
+$brctl addif br-nodes $INTERFACE
diff --git a/files/batdelif.sh b/files/batdelif.sh
index 65fc46d..029b3ca 100644
--- a/files/batdelif.sh
+++ b/files/batdelif.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 INTERFACE="$3"
 
-/usr/local/sbin/batctl if del $INTERFACE
+/sbin/brctl delif br-nodes $INTERFACE
diff --git a/files/collectd.conf.j2 b/files/collectd.conf.j2
index fc11d7f..0313b74 100644
--- a/files/collectd.conf.j2
+++ b/files/collectd.conf.j2
@@ -30,7 +30,7 @@ LoadPlugin filecount
 <Plugin "filecount">
   <Directory "/opt/freifunk/tunneldigger_interfaces">
     Instance "tunneldigger-connections"
-    Name "l2tp1*"
+    Name "l2tp*"
   </Directory>
 </Plugin>
 <Plugin write_graphite>
diff --git a/files/collectd_td_stat.sh b/files/collectd_td_stat.sh
index a8de947..d600d80 100644
--- a/files/collectd_td_stat.sh
+++ b/files/collectd_td_stat.sh
@@ -6,9 +6,11 @@ fi
 #Remove old Interfaces
 rm /opt/freifunk/tunneldigger_interfaces/*
 #Create Interace files
-for i in `/usr/local/sbin/batctl if | grep l2tp1`;
+for i in `/sbin/brctl show br-nodes | grep l2tp`;
 do
         touch /opt/freifunk/tunneldigger_interfaces/$i
 done
-#Remove Active file
-rm /opt/freifunk/tunneldigger_interfaces/active
+#Remove wrong file
+rm /opt/freifunk/tunneldigger_interfaces/no
+rm /opt/freifunk/tunneldigger_interfaces/br-*
+rm /opt/freifunk/tunneldigger_interfaces/8*
diff --git a/files/keepalive.exit.sh.j2 b/files/keepalive.exit.sh.j2
new file mode 100644
index 0000000..a99b670
--- /dev/null
+++ b/files/keepalive.exit.sh.j2
@@ -0,0 +1,29 @@
+#!/bin/sh
+#
+# -q quiet
+# -c nb of pings
+
+HOST1=8.8.8.8
+HOST2=8.8.4.4
+BATCTL=/usr/local/sbin/batctl
+
+ping -q -c5 $HOST1 > /dev/null
+if [ $? -eq 0 ]
+then
+        echo "ok"
+        $BATCTL gw server 100Mbit/100Mbit
+else
+
+        echo "$HOST1 NICHT ok"
+        ping -q -c5 $HOST2 > /dev/null
+        if [ $? -eq 0 ]
+                then
+                        echo "$HOST2 ok"
+                        $BATCTL gw server 100Mbit/100Mbit
+                else
+                        echo "$HOST2 NICHT ok"
+                        $BATCTL gw off
+        fi
+
+fi
+
diff --git a/files/keepalive.sh b/files/keepalive.sh
index f471a45..19c28dc 100644
--- a/files/keepalive.sh
+++ b/files/keepalive.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Version 1.5
+# Version 1.6
 # Parameter setzen
 GATEWAY1ext=185.66.193.105
 GATEWAY2ext=185.66.193.106
@@ -24,7 +24,7 @@ if [ $(hostname) = "troisdorf1" ] || [ $(hostname) = "troisdorf2" ]
         DEFAULT_GATEWAY=$GATEWAY2
 	DEFAULT_GATEWAYext=$GATEWAY2ext
         FALLBACK_GATEWAY=$GATEWAY1
-        FALLBACK_GATEWAY=$GATEWAY1ext
+        FALLBACK_GATEWAYext=$GATEWAY1ext
 	DEFAULT_GATEWAYv6=$GATEWAY2v6
 	FALLBACK_GATEWAYv6=$GATEWAY1v6
 
diff --git a/files/l2tp_backbone.sh.exit.j2 b/files/l2tp_backbone.sh.exit.j2
index bd86c0b..f9bca4c 100644
--- a/files/l2tp_backbone.sh.exit.j2
+++ b/files/l2tp_backbone.sh.exit.j2
@@ -2,8 +2,8 @@
 # Version 6
 # Der servername muss mit einer einstelligen Zahl aufhoeren!!!!!
 communityname="troisdorf"
-#server="troisdorf1 troisdorf2 troisdorf3 troisdorf4 troisdorf5 troisdorf6 troisdorf7 troisdorf8 troisdorf9"
-server="troisdorf7 {{ sn_hostname }}"
+server="troisdorf1 troisdorf2 troisdorf3 troisdorf4 troisdorf5 troisdorf6 troisdorf7 troisdorf8 troisdorf9"
+#server="troisdorf7 {{ sn_hostname }}"
 domain="freifunk-troisdorf.de"
 mtu={{ sn_mtu }}
 # community MAC address, without the last Byte (:)!
@@ -54,5 +54,8 @@ $ip -6 addr add $communitynetworkv6$octet3rd:${localserver#$communityname}/64 de
 $alfred -i bat0 > /dev/null 2>&1 &
 /bin/sleep 15
 $batadv -i bat0 -s > /dev/null 2>&1 &
-/usr/sbin/service bind9 restart
-/usr/local/sbin/batctl gw client 3
+/bin/systemctl restart isc-dhcp-server
+/bin/systemctl restart bind9
+#/usr/local/sbin/batctl gw client 3
+/usr/local/sbin/batctl gw server 100Mbit/100Mbit
+
diff --git a/files/sn_startup.exit.sh.j2 b/files/sn_startup.exit.sh.j2
index b8c11fd..f99fcc8 100644
--- a/files/sn_startup.exit.sh.j2
+++ b/files/sn_startup.exit.sh.j2
@@ -1,4 +1,5 @@
 #!/bin/sh
+# Version 1.7
 
 curl -X POST --data-urlencode 'payload={"text": "{{ sn_hostname }} is rebooted", "channel": "#technik", "username": "{{ sn_hostname }}", "icon_emoji": ":floppy_disk:"}' https://hooks.slack.com/services/{{ slack_token }}
 
@@ -45,11 +46,23 @@ done
 # Allow MAC address spoofing
 /sbin/sysctl net.ipv4.conf.bat0.rp_filter=0
 
+# Create Tunneldigger Bridge
+/sbin/brctl addbr br-nodes
+/sbin/ip link set dev br-nodes up
+/sbin/ebtables -A FORWARD --logical-in br-nodes -j DROP
+/usr/local/sbin/batctl if add br-nodes
+
 sleep 5
 
-# stop tunneldigger
-/bin/systemctl disable tunneldigger
-/bin/systemctl stop tunneldigger
+# Fixing the nf_conntrack … dropping packets error
+# hashsize = nf_conntrack_max / 4
+sysctl -w net.netfilter.nf_conntrack_max=131072
+echo 32768 > /sys/module/nf_conntrack/parameters/hashsize
+
+# Against Denial of Service attacks from internal network
+# Check with: sysctl -a | grep conntrack | grep timeout
+sysctl -w net.ipv4.netfilter.ip_conntrack_generic_timeout=240
+sysctl -w net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=54000
 
 # restart bird
 /bin/systemctl start bird
@@ -57,12 +70,12 @@ sleep 5
 /bin/systemctl enable bird
 /bin/systemctl enable bird6
 
-# stop radvd
-/bin/systemctl disable radvd
-/bin/systemctl stop radvd
+# Start tunneldigger
+/bin/systemctl restart tunneldigger
+/bin/systemctl enable tunneldigger
 
-# restart DHCP
-/bin/systemctl disable isc-dhcp-server
-/bin/systemctl stop isc-dhcp-server
+# radvd restart
+/bin/systemctl restart radvd
+/bin/systemctl enable radvd
 
 exit 0
diff --git a/files/sn_startup.sh.j2 b/files/sn_startup.sh.j2
index dd4550d..276e10e 100644
--- a/files/sn_startup.sh.j2
+++ b/files/sn_startup.sh.j2
@@ -1,4 +1,5 @@
 #!/bin/sh
+# Version 1.7
 
 curl -X POST --data-urlencode 'payload={"text": "{{ sn_hostname }} is rebooted", "channel": "#technik", "username": "{{ sn_hostname }}", "icon_emoji": ":floppy_disk:"}' https://hooks.slack.com/services/{{ slack_token }}
 
@@ -40,8 +41,24 @@ done
 # Allow MAC address spoofing
 /sbin/sysctl net.ipv4.conf.bat0.rp_filter=0
 
+# Create Tunneldigger Bridge
+/sbin/brctl addbr br-nodes
+/sbin/ip link set dev br-nodes up
+/sbin/ebtables -A FORWARD --logical-in br-nodes -j DROP
+/usr/local/sbin/batctl if add br-nodes
+
 sleep 5
 
+# Fixing the nf_conntrack … dropping packets error
+# hashsize = nf_conntrack_max / 4
+sysctl -w net.netfilter.nf_conntrack_max=131072
+echo 32768 > /sys/module/nf_conntrack/parameters/hashsize
+
+# Against Denial of Service attacks from internal network
+# Check with: sysctl -a | grep conntrack | grep timeout
+sysctl -w net.ipv4.netfilter.ip_conntrack_generic_timeout=240
+sysctl -w net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=54000
+
 # Start tunneldigger
 /bin/systemctl restart tunneldigger
 /bin/systemctl enable tunneldigger
diff --git a/install.sn.yml b/install.sn.yml
index 1a8d4d0..d836102 100644
--- a/install.sn.yml
+++ b/install.sn.yml
@@ -9,7 +9,7 @@
   user: root
   gather_facts: False
   vars:
-    snversion: master_v2.1
+    snversion: master_v3.0.0
     batmanversion: v2015.2
     common_required_packages:
       - git
@@ -71,8 +71,8 @@
       raw: "sed -i '/deb cdrom/c\\#' /etc/apt/sources.list"
     - name: Make this server ansible compatible
       raw: "apt-get update && apt-get install python -y"
-    - name: Add backport repo to source list #target: /etc/apt/sources.list.d
-      apt_repository: repo='deb http://http.debian.net/debian jessie-backports main' state=present 
+#    - name: Add backport repo to source list #target: /etc/apt/sources.list.d
+#      apt_repository: repo='deb http://http.debian.net/debian jessie-backports main' state=present 
     - name: Update apt cache
       apt: update_cache=yes
     - name: Gathering facts
@@ -192,25 +192,26 @@
       with_items: logrotate_config
     - name: Create freifunk directory
       file: path=/opt/freifunk state=directory mode=0755
-    - name: Check gateway / keepalive script
+    - name: Check gateway / keepalive script supernode
       copy: src=./files/{{ item }} dest=/opt/freifunk owner=root group=root mode=0500
       with_items: check_gw_script
       register: check_gw
       when: sn_exit is undefined
+    - name: Check gateway / keepalive script super- and exitnode
+      template: src=./files/keepalive.exit.sh.j2 dest=/opt/freifunk/keepalive.sh owner=root group=root mode=0500
+      register: check_gw
+      when: sn_exit is defined
     - name: Add cron job with check gateway script
       cron: name=check_gw job="/opt/freifunk/keepalive.sh > /dev/null 2>&1" user="root" 
       when: check_gw.changed
-
     - name: Tunneldigger stats
       copy: src=./files/{{ item }} dest=/opt/freifunk owner=root group=root mode=0500
       with_items: tunneld_stats_file
       register: tunneld_stats
-      when: sn_exit is undefined
+#      when: sn_exit is undefined
     - name: Add cron job tunneldigger stats
       cron: name=tunneld_stats job="/opt/freifunk/collectd_td_stat.sh > /dev/null 2>&1" user="root"
       when: tunneld_stats.changed
-
-
     - name: Copy dhcpd template file
       template: src=./files/dhcpd.conf.j2 dest=/etc/dhcp/dhcpd.conf owner=root group=root mode=0444
       register: dhcpd
@@ -229,23 +230,24 @@
       cron: name=backbone special_time=reboot job="/opt/freifunk/l2tp_backbone.sh"
     - name: Add cron startup script
       cron: name=startup special_time=reboot job="/opt/freifunk/sn_startup.sh"
-
     - name: Copy backbone script
       template: src=./files/l2tp_backbone.sh.j2 dest=/opt/freifunk/l2tp_backbone.sh owner=root group=root mode=0544
       when: sn_exit is undefined 
     - name: Copy backbone script
       template: src=./files/l2tp_backbone.sh.exit.j2 dest=/opt/freifunk/l2tp_backbone.sh owner=root group=root mode=0544
       when: sn_exit is defined
-
     - name: Collectd template file
       template: src=./files/collectd.conf.j2 dest=/etc/collectd/collectd.conf owner=root group=root mode=0444
       register: collectd
     - name: Restart collectd
       service: name=collectd state=restarted
       when: collectd.changed
-    - name: configure startup script
+    - name: configure startup script supernode
       template: src=./files/sn_startup.sh.j2 dest=/opt/freifunk/sn_startup.sh owner=root group=root mode=0500
       when: sn_exit is undefined
+    - name: Exit node startup script super- and exitnode
+      template: src=./files/sn_startup.exit.sh.j2 dest=/opt/freifunk/sn_startup.sh owner=root group=root mode=0500
+      when: sn_exit is defined
     - name: SSH authorized_keys
       copy: src=./files/{{ item }} dest=/root/.ssh owner=root group=root mode=0400
       with_items: authorized_keys
@@ -265,9 +267,6 @@
     - name: Interface configuration with ffrl gre tunnel
       copy: src=./files/interfaces-{{ sn_hostname }} dest=/etc/network/interfaces owner=root group=root mode=0544
       when: sn_exit is defined
-    - name: Exit node startup script
-      template: src=./files/sn_startup.exit.sh.j2 dest=/opt/freifunk/sn_startup.sh owner=root group=root mode=0500
-      when: sn_exit is defined
     - apt: update_cache=yes
     - name: Install bird
       apt: state=installed pkg=bird