On May 10th I had a chance to attend again ITNOG in Bologna. Even if ITNOG seems to be an event with focus on ISP I find it very educative for anyone working in the enterprise market. The boundaries between enterprise and ISP network are a common ground for negotiation about connections, routing, security, SLA. Sun Tzu advice it is a good strategy to know your enemy, I see no enemies on the other side of the CPE but the idea remains valid.