Counts input datagrams for which this device was not the final destination, meaning it attempted to route them onward. On a Check Point gateway acting as a routing firewall, this counter is effectively the throughput of transit traffic passing through, as opposed to traffic destined to the gateway itself, so a plateau here while inbound traffic keeps climbing suggests forwarding is capped even though the box is still receiving fine. Example: ipForwDatagrams flatlining while ipInDelivers keeps rising indicates the gateway is happily receiving traffic addressed to itself but has stopped successfully forwarding transit traffic, a routing-table or CPU-saturation symptom.