To successfully create IP tunnels, you must observe the following requirements:
If you use host names instead of literal IP addresses, these names must resolve to valid IP addresses that are compatible with the tunnel type.
The IPv4 or IPv6 tunnel that you create must not share the same tunnel source address and tunnel destination address with another configured tunnel.
The IPv4 or IPv6 tunnel that you create must not share the same tunnel source address with an existing 6to4 tunnel.
If you create a 6to4 tunnel, that tunnel must not share the same tunnel source address with another configured tunnel.
For more information, see Planning for Tunnel Use in the Network in Planning for Network Deployment in Oracle Solaris 11.2 .