Anti-DDoS Mechanism in openssh-8.5p1

Created by: kircherlike

Once, I also submitted a ddos question to the openssh community: https://bugzilla.mindrot.org/show_bug.cgi?id=3211

They added the configuration items PerSourceMaxStartups and PerSourceNetBlockSize to openssh-8.5p1. I think that the two parameters can be properly configured to prevent "dheat" from attacking OpenSSH.