I would like to know how to find out the number of currents sessions or TCP connections that are on my devices. Among all the devices I am monitoring, there are two of them, a firewall and a switch, from which I want to know the number of current sessions they have. I am monitoring the firewall by SNMP, I have imported the MIBs, and there is OID wgSystemCurrActiveConns, which shows the "The total number of currently active system connections.", but the numbers are not convincing at all. For the switch, I am monitoring it by SNMP and sFlow. By SNMP, it has other OID which also shows the number of current connections, but the number are not convincing at all either. By sFlow, I can see number of bytes per source, number of bytes per type of traffic, number of bytes per port, but I don't find an option to see the total number of current sessions or connections. Any tip?