This object counts SCTP packets received from peers on this specific association with an invalid checksum. On an otherwise idle physical link, checksum errors point to corruption somewhere in the path, such as bad cabling, a failing NIC, or MTU and fragmentation issues, specific to the traffic reaching this one association's endpoint. This counter increasing only for associations routed over one particular WAN circuit, while associations on other circuits stay at zero, would localize a corruption problem to that specific physical path.