On Tue, 2009-11-03 at 22:10 -0500, Keith Moore wrote:
> Roger Marquis wrote:
> > One example that's often cited as being a NAT issue is
> > SIP(/STUN/TURN).  The real issue here, however, is SIP's embedding of
> > a network layer address in the application data.  This convoluted
> > authentication mechanism, and ISO 7 layer model breakage, is
> > the problem, not NAT.  
> The Internet was not designed according to the ISO 7 layer model. 
> There's absolutely nothing wrong with passing network layer addresses in
> application messages in the Internet architecture.  And DNS is, as far
> as the architecture is concerned, just another application.

Unfortunately, this architecture does not scale in a network where hosts
are dynamically multihomed and/or mobile.


Regards,

// Steve

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