Thanks Andy.
I've already tried commands from above link but all of them are showing real time connections which are being, of course, impossible to catch in one, sort to say snapshot....
Following I've tried so far :
fwaccel conns | grep <IP>
netstat -ni | grep <IP>
fw tab -t connections -u -f | grep <IP>
fwaccel conns | grep <IP> | wc -l
All of above showing real time dynamically data flow....
What I actually need is one command which will show how many sessions do I have currently & overview (or in one second) through one IP.
Thanks!