Hi Olli,

Olli wrote:
> -> NetBSD-box: 192.168.1.1 netbsd1.network.de
> -> Linux-box:    192.168.1.2    debian1.network.de
> -> telnet 141.30.4.242 (physik.phy.tu-dresden.de)
> 
> I append the output from "tcpdump -i ppp0" and my ipnat.conf - file. I
> hope someone can help me.

There are several problems with this tcpdump:

1) You didn't use all the options I asked you to (-v -v -x -s 1500 are
missing).
2) You seem to have several connections from the netbsd-machine (I
assume
   this is dialup-250.dresden.nacamar.de) to physik.phy.tu-dresden.de.
   This makes it unneccessary harder to see what's actually going on.
   Please keep the examples/test cases as simple as possible. That way
   people can have a short look on it and easily spot what's wrong.
3) You should have used the option -n to tcpdump, which prevents
nameservice
   lookups. This wasn't your fault as I didn't tell you :-)
4) The tcpdump from the other interface to the linux machine is missing.

Nevertheless after reading through the tcpdump I figured that the netbsd
box
isn't sending anything from the port range 40000:60000. That means that
the
request from the linux machine doesn't get translated at all. This is
probably due to you ipnat.conf file:
map ppp0 192.168.1.0/24 -> 0/32 portmap tcp/udp 40000:60000
map ppp0 192.168.1.0/24 -> 0/32 

Try the following line as your ipnat.conf:

map ppp0 192.168.1.0/24 -> 0.0.0.0/32 portmap tcp/udp 40000:60000

For further reading I suggest you go to

http://www.de.netbsd.org/Documentation/network/index.html

And follow the link to the NAT FAQ. Read it carefully. If you still
encounter
any problems afterwards, please feel free to come back with a simple
example/
test case to show what doesn't work.

Hope this helps,

  Guenther

P.S.: Please don't send me a personal copy of the emails. I am on this
list
and will read any mail sent to this list.