Yoav Nir wrote:

> Why not?  While I agree that firewalls are diverse, they are all
> made by vendors, and the big firewall vendors all have employees
> who participate in the IETF. An IETF standard that allows firewall
> traversal for legitimate traffic is very likely to be adopted by
> all the vendors. It might not work with some bargain basement
> home router you get at Wallmart, but even they eventually get
> updated software.

According to your theory, a universal NAT traversal protocol
should already exists.

                                                Masataka Ohta


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