HardwareErrors is a read-only Counter32 counting the number of hardware errors recorded for this IP host. A rising hardware-error count on a specific IP host points an admin toward a physical-layer problem, such as a failing NIC or bad cabling, rather than a software or configuration issue, and — since this isb table duplicates the row layout of the MIB's ilb table but is sampled and indexed independently — a given host can show different collection intervals in isb than it does in ilb. If host 10.4.12.30 shows hardware errors climbing while other IP hosts on the same segment stay clean, that isolates the fault to the equipment involved in this particular conversation.