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Eric Hall <ehall () ehsco com> has expressed the position succinctly:
The fact is that I can write an Internet-compliant application in
about two minutes that will break every NAT ever sold, simply because
they don't have a proxy for the protocol. NATs violate fundamental
Many stupid things can be done in about two minutes. This particular
fundamentalist tenet has been at odds with reality since the first
firewall was installed, and will only become more so.
Oh yes, the firewall. That convenient device that network software
developers can assume will always pass port 80 and 443 traffic. So
everything uses port 80 and 443 in the future Internet, and we're all the
better for it.
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