Add IPv6 support
Add IPv6 support. The following scenarios were tested:
- subnet-to-subnet where the endpoints and the subnets are IPv6
- subnet-to-subnet where the endpoints are IPv4 and the subnets IPv6
- subnet-to-subnet where the endpoints are IPv6 and the subnets IPv4
- roadwarrior mode with IPv6 addresses
Edited by Beniamino Galvani