What does ubuntu use for a firewall?

[Mario Vukelic]

On Thu, 2007-04-26 at 19:31 -0600, debiani386 wrote:
> i just have trial software that i rely on heavily and im not about to
> pay for it (im not paying over 100 dollars for software that i badly
> need) 

Users of free/open source software should be diligent in following
proprietary software licenses, since we expect the same thing for free
software.

What's wrong with paying the requested fee (and $100 is not all that
much) if you heavily rely on the software?