Gwebcache is pretty darn cool, I must admit.

However, I was never fully comfortable with the idea that the IP address are not tested to make sure they can accept incoming connections.

I also feel that even Gwebcache is vulnerable to attacks, although the attacks will not be completely effective at blocking access to the network, they can cause connection establishment to take longer.

However, kudos to the developers of gwebcache for tackling this difficult problem head-on.