This Gauge32 counts IPv4 packets filtered by the STU during the current 15-minute collection interval. Because IPv4 carries the bulk of ordinary subscriber traffic, a high value here during an open complaint of 'no internet' points straight at an active filter blocking the customer's own IP traffic. For example, support staff polling hcxStuL2CurrIpv4FiltStat mid-incident and seeing hundreds of filtered IPv4 packets can confirm the STU's own filtering, not the upstream network, is the cause.