[asterisk-users] Should you "ever" use nat=no?

[sean darcy]

I've been lurking on the dev discussion on creating nat=auto. It all 
leads me to think there's no reason to use nat=no.

We have about 60 internal sip extensions connected to an multihomed 
asterisk box where the external ip is not nat'ed. Each of the internal 
sip contexts has nat=no. On startup I get a slew of warnings about 
intruders being able to distinguish real extensions. But that isn't 
right, is it? Or if it is, wouldn't the intruder have to be on the 
"inside" 10.0.0.0 net?

But so what? Does nat=no buy you anything? faster? slicker? richer?

sean