While Hamachi is useful for JJ2 players who can't play online via the normal method, it does have its own problems. The whole idea of Hamachi is not to play JJ2 online, but to create a local lan with people over the internet.

Using Hamachi basically removes the security offered to you by having a firewall and a router. They become part of your local secure network.

Secondly most firewalls dont block a lot of Hamachi traffic because it appears to be coming from a local network source (Windows Firewall is an example of this). Its dangerous and I would recommend being high cautions of who you play with.

To try and suggest that be the new online play, its quite frankly quite scary and shows little understanding to security. The person your playing doesnt have to be a 'hacker' as such, if there PC is infected with viruses, worms, trojans and such your security is at risk. So people may not mean harm, but could be harmful.

Basically if your going to suggest people use Hamachi, you might as well ask them to plug their PC directly into their internet connection and turn off any firewall. (How many people would do that?)

While I do see the benefits of Hamachi, and have myself used it with fellow Digiex Admins, it still doesnt outway the risks and is no way suited to play with 'random people' on the internet.

Had someone with the exact same problem, you could look into DD-WRT and various other custom firmwares for your Linksys Router, the UPnP in them works much better. Though do read about the risks of upgrading to custom firewares as well before you try anything.

Learn to read the thread before replying.