This counter tallies IP packets that were queued to be sent but had to be discarded due to a lack of buffer space, a specific subset of the broader outDiscards count. A rising value suggests the device is trying to transmit more outbound IP traffic than its buffer pool can hold at once, which will manifest as dropped outbound data. An admin seeing outNoPacketBuffers increase during a burst of outbound alerts or responses would consider that burst to be outrunning the device's transmit buffering.