This talk will provide insight into the network components of a hosting business and the role OpenBSD software can serve there. I will show examples of what works, what pitfalls are to be reckoned with and how to avoid them, with emphasis on the network (and system-)administrators point of view. My talk will describe the components of a enterprise network, based on real world examples (a hosting company network, and a eyeball/access network). The description will focus on IP routing inside the network and connectivity to the internet, and describe how far open source software on modern hardware can push the performance envelope compared to hardware based routers in the core. I will show what one can gain from using OpenBSD in this role and were the current limits are. Further areas i will touch (time permitting) are the capabilities of OpenBSD software for * monitoring * loadbalancers/firewalls * traffic analysis * running Virtual Private Networks and * how to design the network for resilience and safe operation I also want to cover the aspect of maintenance and upgrades and how to handle changes to the network and changes in the software while keeping the network running. I will try to present the topic in a way that is helpful to admins who need to start or expand a network and need additional tools at hand.