[VOIPSEC] IPv6 and the demise (or not) of NAT (was Re: Interactive Connectivity Establishment (ICE))

[Randell Jesup]

Simon Horne <s.horne at packetizer.com> writes:
>>         Another big problem with UPnP is the double-nat problem.
>>Put a device behind two UPnP NATs and you can't open a port through both.
>>With STUN/etc, you can open ports through any number of NATs.
>
>Except if one of those NAT's is symmetric (which is 90% of all routers are)
>then it maybe broke.

        Oh, a lot lower than 90% for home router/nat/firewalls (and it used
to be 90% not-symmetric).  Though it is unfortunately increasing.

-- 
Randell Jesup, Worldgate (developers of the Ojo videophone), ex-Amiga OS team
rjesup at wgate.com