I am implementing connection rate limiting connections from site-local hosts, some of which have anti-social behavior and use up all of the available IP connection sockets at times. Currently I have inherited a setting of
smtp_connect_backlog = 40
# max number of concurrent SMTP connections
smtp_accept_max = 60
# don't attempt immediate delivery when more than 40 connections
# in progress (default = 10)
smtp_accept_queue = 40
In respect of smtp_accept_max is there some upper limit and, for RH Linux, how do I find out what this may be. There is presumably some Kernel limit, but there are other things to consider too. Is this just something people adjust hubristically or is there a more scientific approach?
Same question for smtp_connect_backlog.
Do not assume what I have inherited makes any sense.
Best
Rob
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