Counts IP fragments received that needed to be reassembled at this device, meaning they arrived broken into pieces rather than as complete datagrams. Sustained nonzero ipReasmReqds on a gateway interface is worth attention because fragmented traffic is both a common technique used to evade firewall inspection and a source of extra CPU load for reassembly, so an unexpected rise can indicate either a path-MTU problem or fragmentation-based evasion attempts. Example: ipReasmReqds jumping right after a new remote site began sending traffic over a low-MTU tunnel suggests that site's packets are now routinely arriving fragmented and consuming extra reassembly overhead on the gateway.