diff --git a/files/interfaces-troisdorf1 b/files/interfaces-troisdorf1
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+# This file describes the network interfaces available on your system
+# and how to activate them. For more information, see interfaces(5).
+
+source /etc/network/interfaces.d/*
+
+# The loopback network interface
+auto lo
+iface lo inet loopback
+        up ip address add 185.66.193.105/32 dev lo
+
+iface lo inet6 loopback
+        up ip address add 2a03:2260:121::105/48 dev lo
+
+
+# The primary network interface
+allow-hotplug eth0
+iface eth0 inet dhcp
+        post-up iptables -P OUTPUT ACCEPT
+        post-up iptables -A OUTPUT -o eth0 -d 10.0.0.0/8 -j DROP
+        post-up iptables -A OUTPUT -o eth0 -d 172.16.0.0/12 -j DROP
+        post-up iptables -A OUTPUT -o eth0 -d 169.254.0.0/16 -j DROP
+        post-up iptables -A OUTPUT -o eth0 -d 192.168.0.0/16 -j DROP
+        post-up iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
+auto 6to4
+	iface 6to4 inet6 6to4
+        local 163.172.27.8
+
+# GRE Tunnel zum Rheinland Backbone
+# - Die Konfigurationsdaten werden vom Rheinland Backbone vergeben und zugewiesen
+
+# Berlin Router A
+auto gre-bb-a.ak.ber
+iface gre-bb-a.ak.ber inet static
+        address 100.64.2.151
+        netmask 255.255.255.254
+        pre-up ip tunnel add $IFACE mode gre local 138.201.54.123 remote 185.66.195.0 ttl 255
+        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
+        post-up ip link set $IFACE mtu 1400
+        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-down ip tunnel del $IFACE
+
+iface gre-bb-a.ak.ber inet6 static
+        address 2a03:2260:0:155::2/64
+        netmask 64
+        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
+
+# Berlin Router B
+auto gre-bb-b.ak.ber
+iface gre-bb-b.ak.ber inet static
+        address 100.64.2.153
+        netmask 255.255.255.254
+        pre-up ip tunnel add $IFACE mode gre local 138.201.54.123 remote 185.66.195.1 ttl 255
+        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
+        post-up ip link set $IFACE mtu 1400
+        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-down ip tunnel del $IFACE
+
+iface gre-bb-b.ak.ber inet6 static
+        address 2a03:2260:0:156::2/64
+        netmask 64
+        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
+
+
+# Duesseldorf Router A
+auto gre-bb-a.ix.dus
+iface gre-bb-a.ix.dus inet static
+        address 100.64.2.155
+        netmask 255.255.255.254
+        pre-up ip tunnel add $IFACE mode gre local 138.201.54.123 remote 185.66.193.0 ttl 255
+        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
+        post-up ip link set $IFACE mtu 1400
+        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-down ip tunnel del $IFACE
+
+iface gre-bb-a.ix.dus inet6 static
+        address 2a03:2260:0:157::2/64
+        netmask 64
+        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
+
+
+# Duesseldorf Router B
+auto gre-bb-b.ix.dus
+iface gre-bb-b.ix.dus inet static
+        address 100.64.2.157
+        netmask 255.255.255.254
+        pre-up ip tunnel add $IFACE mode gre local 138.201.54.123 remote 185.66.193.1 ttl 255
+        post-up iptables -t nat -A POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-up iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
+        post-up ip link set $IFACE mtu 1400
+        post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.105
+        post-down ip tunnel del $IFACE
+
+iface gre-bb-b.ix.dus inet6 static
+        address 2a03:2260:0:158::2/64
+        netmask 64
+        post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312