Count active TCP connections

Kris · Post by **Kris** » Thu Sep 19, 2013 6:25 am

Hiya all,

I'm looking for a way to count active TCP connections on a remote computer.
Of course I could run "netstat -a > result.txt" on the remote computer and count the number of lines in "result.txt" minus 5 for header and blank line, but that would be my last resort.

A more sophisticated approach, maybe through WMI, would be more desirable...

Any ideas?

Thanks!
Kris

Kris · Post by **Kris** » Thu Sep 19, 2013 6:55 am

Allright...

I found "Win32_PerfFormattedData_Tcpip_TCPv4" and the caption "ConnectionsActive".

However, I'm not sure what I'm looking at.

The WMI value is quite different from the number of TCP lines when using netstat...

KS-Soft Europe · Post by **KS-Soft Europe** » Thu Sep 19, 2013 7:52 am

You may use SNMP GET test and query OID: 1.3.6.1.2.1.6.9.0
It shows the number of TCP connections for which the current state is either ESTABLISHED or CLOSE-WAIT.
Please note: SNMP Service should be configured properly and started on target system.

KS-Soft Europe · Post by **KS-Soft Europe** » Thu Sep 19, 2013 8:10 am

Same data can be retrieved by the following WMI query:
select ConnectionsEstablished from Win32_PerfFormattedData_Tcpip_TCPv4

Kris · Post by **Kris** » Thu Sep 19, 2013 8:33 am

Neither value match the number of connections shown by netstat.
Still not shure which one to use....

Kris · Post by **Kris** » Thu Sep 19, 2013 8:43 am

Ah...

netstat also show local connections.
That seems to explain the difference.

Now I need one more value:
The number of unassigned TCP ports

KS-Soft · Post by **KS-Soft** » Thu Sep 19, 2013 1:02 pm

We cannot find such counter.

Regards
Alex