Thank you for the hint. I downloaded it from
http://prdownloads.sourceforge.net/portfwd
It works great, but I have to run it under root rights.
Otherwise I get 
	wsconsctl: /dev/wskbd0: Permission denied

oliver

Am Sa, 2004-01-31 um 13.07 schrieb netbsd@wolfnode.de:
> 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
> >
> >