TLS/FTP via OpenBSD NAT

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To: <misc@...>
Date: Friday, October 12, 2007 - 7:46 am

Hello all,

I have a few OpenBSD servers faithfully running NAT in various spots.

One of these firewalls is doing VERY simple NAT on an interface,
almost a cut and past from the PF pages (only really the IP addresses
got changed).

However, the client wants to be able to connect to an FTP server that
is using TLS.

My first thought of this was "you can't". however, I was quickly
disabused of this idea by connecting to their server using the program
they use (FileZilla) within a Windows XP instance running inside
Parrallels through a Netlink ADSL modem. That is two sets of
translation happening!

This got me confused as everything I have read about TLS says this
can't be done. At least not with NAT.

So I am wondering if anyone has had any experience with this and can
point me in the right direction?

The only way I can think that the Netlink is doing it is by doing some
sort of Dynamic IP Address forwarding (setting up some rule that just
dumps all traffic directly...) but I don't know.

Regards

Mikel

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Messages in current thread:
TLS/FTP via OpenBSD NAT, Mikel Lindsaar, (Fri Oct 12, 7:46 am)
Re: TLS/FTP via OpenBSD NAT, Joachim Schipper, (Fri Oct 12, 11:17 am)
Re: TLS/FTP via OpenBSD NAT, Boris Goldberg, (Fri Oct 12, 10:17 am)