Subject: Re: (NAT) NAPT behavior

From: Pyda Srisuresh <[email-masked]>
Date: Thu, 16 Sep 1999 16:07:28 -0700 (PDT)

--- Tim Dorcey <[email-masked]> wrote:
> Pyda Srisuresh wrote:
> 
> > > In a similar vein, if a NAT administrator has set up a static port
> mapping
> > > so that all UDP packets which arrive at (public addr,port y) are
> forwarded
> > > to (private addr,port x), is it safe to assume that any UDP packet which
> > > originates at (private addr,port x) will be forwarded from (public
> > > addr,port y)?
> > >
> > Yes, if the NAPT believes the outbound packets to be pertaining to an
> > inbound session for which it already has a state.
> 
> How about if there is currently no "inbound session?"  Does anyone know what
> a
> typical NAPT would be expected to do?  Or, what any specific NAPT product
> would
> do?
> 
> Tim
> 
If the static port binding is for inbound sessions, that is what a NAPT 
would permit. This is what I assumed you were saying. 

However, if your NAPT permits configuring static port binding for inbound,
outbound or bi-directional sessions, I dont see a problem with that either.
It is important to note that NAT is session based - that includes session
orientation.

cheers,
suresh

===

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