Re: Application protocols and Address Translation

> > The question is, what are the applications-specific arguments
> > against translated addresses? What are the brokenness conditions
> > caused by translated addresses (and the associated statefulness)?
> 
> FTP, SIP and DNS are three protocols which have problems. Or not really
> SIP but anything which uses RTP and is launched by an SDP specification.
> 
> Or, if you look at the situation when more than one host share one IP
> address (not really address translation, but anyway, the normal way NAT
> is implemented -- as 1:N mappings) and you have more than one host
> listening for incoming connections, like an SMTP server.

see:

http://www.cs.utk.edu/~moore/what-nats-break.html
and also section 1.1 of 
http://www.cs.utk.edu/~moore/I-D/draft-moore-nat-tolerance-recommendations-00.txt