How to create a mesh VPN network using Tunnel Interfaces and OSPF
It is quite easy to implement a Hub and Spoke VPN network using both Tunnel Interface and OSPF but the transition to a mesh network can be troublesome if you want to redistribute the SonicWall’s firewalled subnets. If you simply use the option “Redistribute Connected Network” in your OSPF configuration, it will perfectly work in hub and spoke environment but will prevent transition to a mesh environment as a tunnel interface is considered a connected interface by the SonicWall, hence the “spoke to spoke” VPN tunnel will fail to be created as both spokes will try to contact each other via the already existing VPN tunnel to the Hub.
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how_to_create_a_mesh_vpn_network_using_tunnel_interfaces_and_ospf.pdf