Yeah, plenty of ISP's use OpenBSD, BSDs generally.

Thanks. I've probably been supporting servers before you were born, but thanks anyway juvenile.

Obviously you have to hide yourself, posting anonymously! Only COWARDS speak in hiding!!!

There's only one solution when it comes to my network and servers, that's OpenBSD. It's secure, stable and correct coding making it an easy choice. I run a VPN, Web and redundant Firewall servers and OpenBSD gives me a piece of mind, ensuring it's stability. Stability and security are paramount for my network. PF is the king of firewall rules and iptables is an absolute mess. It's simple folks. If you want a serious OS for internet facing infrastructure, why choose anything else. OpenBSD is the obvious answer!