Met het programma Hamachi is het mogelijk om 'directe' verbinding op te zetten tussen verschillende computers zonder daarbij gehinderd te worden door een eventuele router, gateway of firewall. Vervolgens kunnen via deze verbinding bestanden worden uitgewisseld en is het mogelijk om multiplayer games te spelen. Versie 0.9.9.7 is sinds kort beschikbaar en volgt versie 0.9.9.6 in een razend tempo op. De release notes van beide zijn als volgt:
Is identical to 0.9.9.6 except for the fix for generic error problem. If you are experiencing this problem, please manually update to 0.9.9.7.
0.9.9.6 implements P2P key exchange. This is a subtle, but nevertheless very important change to the security framework. Pre-0.9.9.6 clients used random material provided by the server to derive their p2p encryption keys. Theoretically this meant that the server could've potentially derived the same keys and thus be able to decrypt all p2p traffic should it be able to intercept it. Starting with 0.9.9.6 clients now generate and authenticate this material completely on their own. When it comes to p2p security, the server is now used exclusively for publishing and retrieving client's public keys. The Security page has been updated with detailed description of the key exchange protocol. You can tell whether you and your peer are using p2p encryption keys by looking at status tooltip for the peer. If the Crypto line says AES-256-SHA1, P2P, then - yes - p2p crypto is being used.
This release also adds an option for controlling Hamachi network adapter packet queue length. This is directly related to a 'high ping' issues with games reported earlier in Forums. Should you encounter this problem, you may try resolving it by reducing adapter packet queue as described below. Shorter queue would cause greater packet loss under the network load, which will presumably cause sending application to reduce its packet rate and thus may help normalize things. Default packet queue is 2048 packets. It is suggested to reduce it down to 64, 32 or even 16 packets when troubleshooting CPU/net congestion issues.
Lastly, this release includes various installer and application fixes for problems caused earlier by adding xp64 support.