4 - Support 1.0's way of authentication (presence of key or certificate)
5 - Support signed certificates
7 - Support SRP authentication
9 - Secure PMTU detection (either 1.0's way or from a suitable RFC)
10 - Support TLS resume capability
13 - Finish connection management
14 - Finish/redo graph algorithms
15 - Keep per-node statistics
16 - Support multicast routing (and snooping in switch mode)
18 * Recreate documentation
20 * Add management interface