Checking operation

From a host on site A that belongs to one of the VLANs, ping a host on site B belonging to the same VLAN. The host on site B should respond to requests.

You can also check whether VLANs are being transported in the tunnel by making a network capture on the incoming interface of the tunnel on site B’s firewall. In this case, captured network packets will show the GRE protocol that encapsulates the transported VLAN (VLAN 20 in the example):