Reports the highest number of concurrent connections this gateway has recorded since its counters were last reset. This peak, rather than the current fwNumConn, is what capacity planning actually sizes the connection table against, since a brief historical peak that came close to fwConnTableLimit is a stronger indicator of future risk than whatever the connection count happens to be right now. Example: a gateway whose fwPeakNumConn came within a few percent of fwConnTableLimit during a past seasonal traffic spike is a strong candidate for a connection-table size increase ahead of the next peak event.