Startup Defense.net makes its debut today with the aim of stopping distributed denial-of-service (DDoS) attacks aimed by attackers against both enterprises and cloud service networks. The Belmont, Calif.-based company is founded by its CTO, Barrett Lyon, who started another anti-DDoS company in 2003 called Prolexic Technologies. Defense.net next month will be detailing how it provides anti-DDoS mitigation as its first service is rolled out.