limit-req and greedy UAs

[Grant]

> ‎This page has all the secret sauce, including how to limit the number of connections.
>
> https://www.nginx.com/blog/mitigating-ddos-attacks-with-nginx-and-nginx-plus/
>
> I set up the firewall with a higher number as a "just in case."


Should I basically duplicate my limit_req and limit_req_zone
directives into limit_conn and limit_conn_zone?  In what sort of
situation would someone not do that?

- Grant