Re: Nated connection behavior

[Mr Vandeley <mr.vandeley@gmail.com>]

On Thu, Mar 5, 2009 at 3:12 PM, James Stull <rivitir@gmail.com> wrote:
> NAT doesn't rewrite that section of a packet. Instead it "saves" the
> communication in memory this way your computer thinks it's talking directly
> to the server.
>
> You can kind of think of it like if you sent a letter to a friend:
>
> |You|<----->[Postal Service]<---->|Friend|
>
> Neither of you think about the postal service between you and how it works,
> instead you only think your talking to each other via your letters.
>
> Hope this helps.
>
> --James

Great, thanks James for your answer.

So, this "saved communication" is saved by NAT or by the conntrack module?

I ask this,  because I see that on CISCO routers, NAT doesn't behave
the same way. If I replace the Linux Router for a Cisco router,
configured nating everything that comes out on its external interface,
answers come from the router and client just ignore that answer,
right?