Network layer discard reasons

The identifiers for the possible reasons that data is discarded by one of the network layers are as follows. These identifiers are constant values in the IP_DISCARD_REASON enumeration that is defined in Fwpsk.h.

Discard reason identifier	Discard reason description
IpDiscardBadSourceAddress	The outgoing packet's source address is a multicast address, a broadcast address, or an IPv6 address that contains an embedded IPv4 loopback or unspecified address.
IpDiscardNotLocallyDestined	The received packet's destination address does not exist on the system, and no appropriate forwarding interface exists.
IpDiscardProtocolUnreachable	There is either no transport protocol handler for the received packet or the transport protocol handler refused to process the packet.
IpDiscardPortUnreachable	There is no application that is receiving packets on the received packet's destination port.
IpDiscardBadLength	A length field specified within the received packet is inconsistent with the packet's length.
IpDiscardMalformedHeader	The received packet contains a recognized extension header or option whose contents are invalid.
IpDiscardNoRoute	The received packet cannot be forwarded to its destination address because the system's routing table does not contain a route to that destination.
IpDiscardBeyondScope	The received packet cannot be forwarded because the packet's incoming and outgoing network interfaces have different zone indexes for the packet's zone level.
IpDiscardInspectionDrop	Reserved for internal use by the network stack.
IpDiscardTooManyDecapsulations	The received packet cannot be forwarded to its destination address because there are too many decapsulations.
IpDiscardAdministrativelyProhibited	Reserved for internal use by the network stack.
IpDiscardHopLimitExceeded	The received packet's hop limit or time-to-live limit has been exceeded.
IpDiscardAddressUnreachable	The outgoing packet cannot be sent to the packet's destination address either because the destination does not exist or packets are not allowed to be sent to that destination.
IpDiscardRscPacket	The outgoing packet cannot be sent because it is a receive-side coalesced (RSC) packet.
IpDiscardArbitrationUnhandled	Reserved for internal use by the network stack.
IpDiscardInspectionAbsorb	The outgoing packet cannot be sent because WFP took ownership of the packet.
IpDiscardDontFragmentMtuExceeded	Reserved for internal use by the network stack.
IpDiscardBufferLengthExceeded	Reserved for internal use by the network stack.
IpDiscardAddressResolutionTimeout	Reserved for internal use by the network stack.
IpDiscardAddressResolutionFailure	Reserved for internal use by the network stack.
IpDiscardIpsecFailure	Reserved for internal use by the network stack.
IpDiscardExtensionHeadersFailure	Reserved for internal use by the network stack.
IpDiscardAllocationFailure	Reserved for internal use by the network stack.