> Anyone can tell me how can I install m0n0wall on a Soekris
> net4826 using pxe-boot, combios or other thing 

Also checkout the soekris list server. You can google by entering the
search word(s) and limiting the scope to just soekris...ie

4826 site:lists.soekris.com

I found this link
http://lists.soekris.com/pipermail/soekris-tech/2005-February/022694.html

- Don