add ipv6 route

hosts/vm/neo/networking.nix

@@ -46,6 +46,11 @@
               prefixLength = 64;    
             }
           ];
+          routes = [{
+            address = "::";
+            via = "2a0c:700:2::ff:fe00:9902";
+            prefixLength = 0;
+          }];
         };
       };
     };