But anyone who has used the popular internet telephony software Skype knows that it works as smoothly behind a NAT firewall as it does if the PC is connec

But anyone who has used the popular internet telephony software Skype knows that it works as smoothly behind a NAT firewall as it does if the PC is connected directly to the internet. Hmm. Someone who used skype a lot would know that its behaviour is not quite as robust as this article might suggest. You get 'ghost sessions' when people who are not online appear online, and sometimes the reverse - where people come online and you just can't see them. Although in truth I can't remember seeing any those or any other problems like that in six months now - maybe recent versions have conquered those problems. But while I'm complaining, it's annoying that it opens up listeners on 8080 without asking. :)