This read-only Counter tracks the number of unsuccessful attempts to allocate memory for an ARP PDU, distinct from address-table exhaustion tracked by ppeArpOverflows. An administrator uses a rise here to explain hosts failing to resolve the ES/1's MAC address purely due to memory pressure rather than a full ARP table. For example, new hosts fail to ARP for the gateway during a period when ppeArpPduMemoryFailures is nonzero, even though ppeArpOverflows stays at zero, ruling out table-space exhaustion.