I've to confess that I can't bring things up to work properly despite 
Peter's help.
Thus again my configuration:

m0n0wall with 2 NICs
rl0 (PPoE) connected to my modem
rl1 (192.168.0.0   255.255.255.0) my LAN interface
IP of the modem: 150.150.150.0.4  255.255.255.0

I've written the following to my config-xml:

<shellcmd>ifconfig rl0 inet 150.150.150.1 255.255.255.0 alias</shellcmd>

If I'm understanding your posting than I can delete both outbound nat 
rules and deaktivate
Advanced outbound nat.

I've execute the following commands at exec.php:

echo "@7 pass out quick on rl0 from any to any keep state" | ipf -f -
echo "map rl0 150.150.150.0/24 -> 0.0.0.0/32" | ipnat -f -
 
In addition I deactivated the option block private networks.

Thanks and greets
Daniel

Peter Allgeyer schrieb:

>Hi Daniel!
>
>Am Sonntag, den 14.08.2005, 23:18 +0200 schrieb Daniel Heise:
>  
>
>>I've tried to reached my adsl modem which is connected to the wan port 
>>of my m0n0wall.
>>    
>>
>
>You'll find an answer here:
>http://m0n0.ch/wall/list/query.php?query=Help+to+get+this+route+to+work
>+%3F&type=subj&Submit=Search
>
>  
>
>>I've studied the posts in the m0n0wall archive and found this tutorial:
>>http://wiki.m0n0.ch/wikka.php?wakka=AccessingModemOutsideFirewall
>>    
>>
>
>Maybe it's time to edit this article.
>
>Ciao ...
>	... PIT ...
>
>
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