search for: persourcemaxstartups

...om/blog/2024-04-23-an-analysis-of-dheat-dos-against-ssh-in-cloud-environments/ A short summary: the default MaxStartup setting is fully ineffective in fixing the problem in low-latency network conditions; it is very easy to force a target to hit 100% CPU utilization in that case. Furthermore, the PerSourceMaxStartups setting is only effective when set to 1, which would only allow one unauthenticated connection at a time from any given source. This works poorly in use cases where a burst of new connects is normal. Hence, connection throttling at the kernel level seems a bit better to use in the general case (f...

...-of-dheat-dos-against-ssh-in-cloud-environments/ > > A short summary: the default MaxStartup setting is fully ineffective > in > fixing the problem in low-latency network conditions; it is very easy > to force a target to hit 100% CPU utilization in that case. > Furthermore, the PerSourceMaxStartups setting is only effective when > set to 1, which would only allow one unauthenticated connection at a > time from any given source. This works poorly in use cases where a > burst of new connects is normal. Hence, connection throttling at the > kernel level seems a bit better to use in...