Masquerading

Grischa Schuering (schuering@inity.de)
Fri, 31 Dec 1999 01:58:45 +0100


Hello together,

I was posting quite a lot articels about this matter in newsgroups, now
I know why the things I am trying might not be working. Can you give me the
last hint ?

I set up a private network 192.168.100.0/24 on a linux box by masquerading
(SuSe 6.2) on eth1. eth0 is connected to a registered network which is
connected to the internet by a cisco router. I also use a portmaster router
to dial in from home (on the registered network).
Now I want to reach the computers behind the linux box from the pertmaster,
which has a static route to the private ips.
When masquerading is turned on, it is not working, when I turn it off, it
does. I believe it behaves this way, because all outgoing ips are
masqueraded with the eth0 ip of the linux box.

The start/stop script looks like this:

START

ipchains -N user_msq
ipchains -A user_msq -s 0/0 -d 0/0 -j MASQ
ipchains -A forward -s 192.168.100.0/24 -d 0/0 -i eth0 -j user_msq

STOP

ipchains -D forward -s 192.168.100.0/24 -d 0/0 -i eth0 -j user_msq
ipchains -F user_msq
ipchains -X user_msq

How does the comand has to look like which prevents masquerading a specific
destination ip range ????

Thanks for your help!!

Grischa
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