How do i measure/count concurrent connections?

[wyn]

Hello All,

I have a FreeBSD bridge / transparent firewall running ipfw in a webhosting environment with 100+ servers.
Can someone explain me how i can count the number of concurrent connections?

Best regards,

Wyn

[Alt]

Quick solution - you can setup ipfw rule like this
ipfw add xxxx count ip from any to any 80 setup
Now each 60 second take command
ipfw show xxxx | awk '{print $2;}'
And pass it to rrdtool in counter mode. Or pass these info to cacti.. Then you can get a graph width avg connection requests per minute.
If you want count concurrent connections you must hack/dig your webserver (apache/nginx/etc) for current keepalives/status information, ipfw will not help