diff --git a/files/interfaces-troisdorf1 b/files/interfaces-troisdorf1
index c4fc018..f045727 100644
--- a/files/interfaces-troisdorf1
+++ b/files/interfaces-troisdorf1
@@ -99,8 +99,8 @@ iface gre-bb-b.ix.dus inet6 static
         post-up ip6tables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o $IFACE -j TCPMSS --set-mss 1312
 
 # Frankfurt Router A
-auto bb-a.fra3.fra
-iface bb-a.fra3.fra inet static
+auto gre-bb-a.fra3.f
+iface gre-bb-a.fra3.f inet static
         address 100.64.6.15
         netmask 255.255.255.254
         pre-up ip tunnel add $IFACE mode gre local 163.172.27.8 remote 185.66.194.0 ttl 255
@@ -110,15 +110,15 @@ iface bb-a.fra3.fra inet static
         post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.104
         post-down ip tunnel del $IFACE
 
-iface bb-a.fra3.fra inet6 static
+iface gre-bb-a.fra3.f inet6 static
         address 2a03:2260:0:307::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
 
 
 # Frankfurt Router B
-auto bb-b.fra3.fra
-iface bb-b.fra3.fra inet static
+auto gre-bb-b.fra3.f
+iface gre-bb-b.fra3.f inet static
         address 100.64.6.21
         netmask 255.255.255.254
         pre-up ip tunnel add $IFACE mode gre local 163.172.27.8 remote 185.66.194.1 ttl 255
@@ -128,7 +128,7 @@ iface bb-b.fra3.fra inet static
         post-down iptables -t nat -D POSTROUTING -o $IFACE -j SNAT --to-source 185.66.193.104
         post-down ip tunnel del $IFACE
 
-iface bb-b.fra3.fra inet6 static
+iface gre-bb-b.fra3.f inet6 static
         address 2a03:2260:0:30a::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