a good firewall

Hay /comp/,

What's your favorite firewall program?
I have zonealarm and IMO it is not so great.
After tweaking it to allow minimal traffic to/from my computer, it ran fine for months until all of a sudden it started giving me Generic Host Process Blocked messages from various DNS caches from my ISP. 

Let us not forget that alot of these Software firewalls like to break TCP/IP protocols. And if you are running windows 98 they don't fucking stop me from opening null sessions in telnet. Now stfu and get a router/firewall or a VPN/firewall you cheap cunt.