checking DNS-Response for correct format to avoid answers for non existent URLs.

ffs-set-segment/files/usr/sbin/ffs-set-segment

@@ -14,7 +14,7 @@ fi
 
 NODEID=$(uci get network.bat0.macaddr | sed 's/://g')
 PUBKEY=$(/etc/init.d/fastd show_key mesh_vpn | cut -c1-12)
-SEGINFO=$(nslookup ffs-$NODEID-$PUBKEY.segassign.freifunk-stuttgart.de  [::1]:54 | tail -n1)
+SEGINFO=$(nslookup ffs-$NODEID-$PUBKEY.segassign.freifunk-stuttgart.de  [::1]:54 | grep "2001:2:0:711::")
 if [ -z "$SEGINFO" ]; then
   echo Node not known
   exit 1