This is not NAT, in the usual (RFC) sense,
since it does not change the addresses.
I suggest to check kernel config twice and
ask ipfilter mailing list.

----- Original Message ----- 
From: <netbsd@wolfnode.de>
To: "Oliver Egginger" <oliver.egginger@dvz.fh-giessen.de>
Cc: <netbsd-users@netbsd.org>
Sent: Saturday, January 31, 2004 1:07 PM
Subject: Re: How can I make use of ipnat?


> I also have ipnat, but for pure port forwarding, I recommend "portfwd". It
> is not in pkgsrc as far as I know, but it's really easy to use and can
> even forward to other hosts if desired.
>
> So for me it forwards local port ... hm ... 6222 to remote 6220 or so, i
> can run a vncview across NAT with this nice tool...
>
> Search in the net, it's easy to find.
>
> Florian
>
>
>
> On Sat, 31 Jan 2004, Oliver Egginger wrote:
>
> > Hello,
> >
> > I would like to configure a port forwarding from port 465/tcp to port
> > 25/tcp. I tempted to use ipnat for this, but if I call ipnat I receive
> > every time:
> > ioctl(SIOCGNATS): Operation not supported by device
> > (For example if I simply call ipnat -l)
> >
> > I have these lines (among others) in my kernel conf:
> > pseudo-device bpfilter 8 # Berkeley packet filter
> > pseudo-device ipfilter # IP filter (firewall) and NAT
> >
> > How can I make use of ipnat? Every hint would be appreciated.
> >
> > regards
> > oliver
> >
> >
>
>