concurrent connections and netstat

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Hi All,

Recently I did 'ab' test just to check performance of my new setup. so
far, if we want to check concurrent users for that server, we were
using "netstat -an | grep 'EST' | wc -l" to check how many total no of
connections being used. I know we can use mod_status to get the
accurate results. but I am curious to know, how to determine total no
of concurrent connections being served by Apache web server at any
point of time. Even though I have set 50 concurrent users test with
'ab', I hardly see 50 ESTABLISHED connections! Even I checked total no
of CLOSE_WAIT, TIME_WAIT &  ESTABLISHED connections but that was also
not matching with the result of what mod_status was showing.

Can anyone let me know what could be the reason? I want to know how to
determine that MaxClients limit is approaching just by looking into
netstat o/p (or any other command)  without using mod_status.

Thanks

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