Server attack serious recently, and the most frequent DDOS attack types, as a work in the network security personnel for many years, as a member of the love the community at the same time, the recommendations are as follows:
Add 1, for the community server hardware firewall, recruit professional safety engineer is responsible for maintaining volunteers firewall policy.
2, the server blocking all known IP blacklist connection
3, restrict single IP number of simultaneous connections and set the flow threshold, beyond the part of the boot server to the black hole or flow cleaning equipment.
PS.OVH provide hardware firewall service,please link https://www.ovh.ie/dedicated_servers/firewall_dedicated_servers.xml