Average pps and how to discover cause
 

How many pps (packets per second) roughly can average server user maximum use?

I mean if its normal to have like 100 000 pps

a few VPS users there have around 100,000 - 900,000pps

there has been bans for DoS.

PS: how pps value can be discovered and how tracked to causing process?

thx

You can use vnstat,nload to find pps in realtime and the cause one possibility is ntop or tcpdump