> Can opensource code (RH/Debian/SUSE) modified for inhouse firewall
> platform and can be sold in for commercial use?. Is this GPL coers
> this?. Or Is there any royalty or licensing fee has to pay per unit?.
> What if some modifications does for some of the code?. Thanks.

You can sell the software/firmware to your customers for $1 million
dollars, but once it's provided in binary or compiled form to the customers
you must also provide them with source code should they ask for it. You can
not provide the binary without offering the source.

And once they have the source code, there is nothing that prevents them
from modifying it or redistributing it.

--
Jem Berkes
http://www.sysdesign.ca/