Re: [v6ops] double nat

[Nick Hilliard <[e-mail]>]

On 02/10/2012 11:13, Randy Bush wrote:
> draft-donley-nat444-impacts-04.txt seems to back off reports of
> application issues.  anyone care to swing the clue by four as to
> where multiple layers of nat are formally worse than one layer?

on a slightly less facetious note, you will run into the problem that your
feature set will be reduced to the lowest common denominator feature set of
all the nat implementations on your network path + some delta breakage.
For many services this probably won't make a whole pile of difference, but
for protocols which require ALG support, you can run into difficulties
either through implementation or policy.  E.g. PASV followed by no PASV for
ftp, broken sip implementations, etc.

Nick