This Gauge32 is the finalized tally of IPv4 packets filtered by the STU during the previous 15-minute period. It gives a stable, already-closed data point that an admin can compare against the live current-period IPv4 filter counter to judge whether the volume of blocked subscriber traffic is increasing or subsiding. For example, if hcxStuL2PrevIpv4FiltStat was low but the current-period equivalent is climbing fast, that trend alone would justify escalating an intermittent 'slow internet' complaint.