diff --git a/etc/default/babeld b/etc/default/babeld
index 6f8512a..2ed7385 100644
--- a/etc/default/babeld
+++ b/etc/default/babeld
@@ -2,7 +2,7 @@
 # sourced by /etc/init.d/babeld
 
 # List of interfaces on which the protocol should operate
-INTERFACES="fff-has2 fff-has fff-wue1 fff-sw"
+INTERFACES="fff-has2 fff-has fff-wue1 fff-sw fff-gw-sw"
 
 # Additional arguments
 DAEMON_ARGS="-S /var/lib/babeld/state"
diff --git a/etc/network/interfaces b/etc/network/interfaces
index b5195e9..5f47f0c 100644
--- a/etc/network/interfaces
+++ b/etc/network/interfaces
@@ -38,6 +38,8 @@ source /etc/network/interfaces.d/gre_fff-wue1
 
 source /etc/network/interfaces.d/gre_fff-sw
 
+source /etc/network/interfaces.d/gre_fff-gw-sw
+
 #source /etc/network/interfaces.d/gre_fff-gw-wue2
 
 #source /etc/network/interfaces.d/gre_fff-gw-m3
diff --git a/etc/network/interfaces.d/gre_fff-gw-sw b/etc/network/interfaces.d/gre_fff-gw-sw
new file mode 100644
index 0000000..1bd627a
--- /dev/null
+++ b/etc/network/interfaces.d/gre_fff-gw-sw
@@ -0,0 +1,32 @@
+
+#GRE-Tunnel zu fff-gw-sw
+#
+#Dennis Eisold (de@itstall.de)
+#
+#fff-gw-sw
+#       öffentlich:	173.212.207.163
+#       freifunk:	10.50.252.3
+#fff-ab-01
+#       öffentlich:	5.189.177.88
+#       freifunk:	10.50.252.161
+
+auto fff-gw-sw
+iface fff-gw-sw inet static
+	address 10.50.252.161
+	pre-up iptunnel add $IFACE mode gre remote 173.212.207.163  local 5.189.177.88 ttl 255
+	up ifconfig $IFACE multicast
+	pointopoint 10.50.252.3
+	post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --clamp-mss-to-pmtu
+	post-up ip rule add iif $IFACE table fff
+	post-up ip rule add from 10.50.0.0/16 table fff
+	post-up ip rule add to 10.50.0.0/16 table fff
+	post-up ip -6 addr flush dev $IFACE
+	post-up ip -6 addr add fe80::1983:1:5/64 dev $IFACE
+	post-down ip rule del iif $IFACE table fff
+	post-down ip rule del from 10.50.0.0/16 table fff
+	post-down ip rule del to 10.50.0.0/16 table fff
+	post-down iptables -t mangle -D POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --clamp-mss-to-pmtu
+	post-down iptunnel del $IFACE
+
+
+