Dear friends, I searched list archive, but I couldn't find anything about this. I need to correctly design and deploy a brand new FreeRADIUS server. It will receive about 25.000 simultaneous users, so I'm planning to have, at least, two servers. My questions are: 1. What would be recommended server hardware (memory, disk, CPU, ...) and software (Linux distribution, kernel version, ...)? 2. How could I synchronize both servers' users? I mean, in the beginning, I'd have two separate /etc/shadow files but this is not scalable. I need to share a single file between both servers. Is it possible? How? 3. Any recommendations to the backup policy? Best regards, Maurício Harley Suporte Técnico Cisco IP Phone: +55 (85) 3133-7910 Auriga Tecnologia & Negócios Cisco SILVER Certified Partner IBM Business Partner