gw/wireguard: increase Tunnel cost to 1024*3 to prefer bbb

This is subject to change, and probably needs some overhaul
in regards of a general concept. But for now this change
will increase the reliability of our BBB Core network

group_vars/all/general.yml

@@ -50,8 +50,8 @@ freifunk_global_prefix: 2001:bf7::/32
 # Default mesh metric in inbound direction (rxcost) for normal mesh links
 mesh_metric_default_in: 512
 
-# Default mesh metric in inbound direction (rxcost) for tunnels
-mesh_metric_tunnel_in: 1024
+# Default mesh metric in all directions for tunnels
+mesh_metric_tunnel_in: 3072
 
 # Default mesh metrics in inbound direction (rxcost) for adhoc like interfaces
 mesh_metric_adhoc_11a_standard: 2024