mib Probes

The mib provider makes available probes for counters from several MIBs. The protocols that export MIBs instrumented by the mib provider are listed in Table 11-11. The table includes a reference to documentation that specifies some or all of the MIB, the name of the kernel statistic that may be used to access the running counts using the kstat2 -g uri and a reference to the table that has a complete definition of the probes. All MIB counters are also available using the -s option to netstat.

Table 11-11 Descriptions With Links to Specific mib Probes

Protocol	MIB Description	kstat2 URIs	MIB Probes Table
ICMP	RFC 1213	/mib2/ip/icmp/*	Table 11-12
IP	RFC 4293	/mib2/ip/ip/*	Table 11-13
IPsec	-	/mib2/ip/ip/*	Table 11-14
IPv6	RFC 4293	-	Table 11-15
SCTP	SCTP MIB (Internet draft)	/mib2/sctp/sctp/*	Table 11-17
TCP	RFC 1213	/mib2/tcp/tcp/*	Table 11-18
UDP	RFC 1213	/mib2/udp/udp/*	Table 11-19

Table 11-12 ICMP mib Probes

Probe	Description
icmpInAddrMaskReps	Fires whenever an ICMP Address Mask Reply message is received.
icmpInAddrMasks	Fires whenever an ICMP Address Mask Request message is received.
icmpInBadRedirects	Fires whenever an ICMP Redirect message is received that is determined to be malformed in some way (unknown ICMP code, sender or target off-link, and the like).
icmpInCksumErrs	Fires whenever an ICMP message with a bad checksum is received.
icmpInDestUnreachs	Fires whenever an ICMP Destination Unreachable message is received.
icmpInEchoReps	Fires whenever an ICMP Echo Reply message is received.
icmpInEchos	Fires whenever an ICMP Echo request message is received.
icmpInErrors	Fires whenever an ICMP message is received that is determined to have an ICMP-specific error, such as bad ICMP checksum and bad length.
icmpInFragNeeded	Fires whenever an ICMP Destination Unreachable (Fragmentation Needed) message is received, indicating that a sent packet was lost because it was larger than some MTU and the Do not Fragment flag was set.
icmpInMsgs	Fires whenever an ICMP message is received. Whenever this probe fires, the icmpInErrors probe may also fire if the message is determined to have an ICMP-specific error.
icmpInOverflows	Fires whenever an ICMP message is received, but the message is subsequently dropped due to lack of buffer space.
icmpInParmProbs	Fires whenever an ICMP Parameter Problem message is received.
icmpInRedirects	Fires whenever an ICMP Redirect message is received.
icmpInSrcQuenchs	Fires whenever an ICMP Source Quench message is received.
icmpInTimeExcds	Fires whenever an ICMP Time Exceeded message is received.
icmpInTimestampReps	Fires whenever an ICMP Timestamp Reply message is received.
icmpInTimestamps	Fires whenever an ICMP Timestamp request message is received.
icmpInUnknowns	Fires whenever an ICMP message of unknown type is received.
icmpOutAddrMaskReps	Fires whenever an ICMP Address Mask Reply message is sent.
icmpOutDestUnreachs	Fires whenever an ICMP Destination Unreachable message is sent.
icmpOutDrops	Fires whenever an outbound ICMP message is dropped for some reason (such as memory allocation failure, broadcast/multicast source or destination, and the like).
icmpOutEchoReps	Fires whenever an ICMP Echo Reply message is sent.
icmpOutErrors	Fires whenever an ICMP message is not sent due to problems discovered within ICMP, such as a lack of buffers. This probe will not fire if errors are discovered outside the ICMP layer, such as the inability of IP to route the resulting datagram.
icmpOutFragNeeded	Fires whenever an ICMP Destination Unreachable (Fragmentation Needed) message is sent.
icmpOutMsgs	Fires whenever an ICMP message is sent. Whenever this probe fires, the icmpOutErrors probe might also fire if the message is determined to have ICMP-specific errors.
icmpOutParmProbs	Fires whenever an ICMP Parameter Problem message is sent.
icmpOutRedirects	Fires whenever an ICMP Redirect message is sent. For a host, this probe will never fire, because hosts do not send redirects.
icmpOutTimeExcds	Fires whenever an ICMP Time Exceeded message is sent.
icmpOutTimestampReps	Fires whenever an ICMP Timestamp Reply message is sent.

Table 11-13 IP mib Probes

Probe	Description
ipForwDatagrams	Fires whenever a datagram is received that does not have this machine as its final IP destination, and an attempt is made to find a route to forward the datagram to that final destination. On machines that do not act as IP gateways, this probe will only fire for those packets that are source-routed through this machine, and for which the source-route option processing was successful.
ipForwProhibits	Fires whenever a datagram is received that does not have this machine as its final IP destination, but because the machine is not permitted to act as a router, no attempt is made to find a route to forward the datagram to that final destination.
ipFragCreates	Fires whenever an IP datagram fragment is generated as a result of fragmentation.
ipFragFails	Fires whenever an IP datagram is discarded because it could not be fragmented, for example, because fragmentation was required and the Do not Fragment flag was set.
ipFragOKs	Fires whenever an IP datagram has been successfully fragmented.
ipInCksumErrs	Fires whenever an input datagram is discarded due to a bad IP header checksum.
ipInDelivers	Fires whenever an input datagram is successfully delivered to IP user protocols, including ICMP.
ipInDiscards	Fires whenever an input IP datagram is discarded for reasons unrelated to the packet, such as for lack of buffer space. This probe does not fire for any datagram discarded while awaiting reassembly.
ipInHdrErrors	Fires whenever an input datagram is discarded due to an error in its IP header, including a version number mismatch, a format error, an exceeded time-to-live, an error discovered in processing IP options, and the like.
ipInIPv6	Fires whenever an IPv6 packet erroneously arrives on an IPv4 queue.
ipInReceives	Fires whenever a datagram is received from an interface, even if that datagram is received in error.
ipInUnknownProtos	Fires whenever a locally addressed datagram is received successfully but subsequently discarded because of an unknown or unsupported protocol.
ipOutDiscards	Fires whenever an output IP datagram is discarded for reasons unrelated to the packet (for example, for lack of buffer space). This probe will fire for a packet counted in the ipForwDatagrams MIB counter if the packet meets such a (discretionary) discard criterion.
ipOutIPv6	Fires whenever an IPv6 packet is sent over an IPv4 connection.
ipOutNoRoutes	Fires whenever an IP datagram is discarded because no route could be found to transmit it to its destination. This probe will fire for a packet counted in the ipForwDatagrams MIB counter if the packet meets this "no-route" criterion. This probe will also fire for any datagrams which cannot be routed because all default gateways are down.
ipOutRequests	Fires whenever an IP datagram is supplied to IP for transmission from local IP user protocols (include ICMP). Note that this probe will not fire for any packet counted in the ipForwDatagrams MIB counter.
ipOutSwitchIPv6	Fires whenever a connection changes from using IPv4 to using IPv6 as its IP protocol.
ipReasmDuplicates	Fires whenever the IP reassembly algorithm determines that an IP fragment contains only previously received data.
ipReasmFails	Fires whenever any failure is detected by the IP reassembly algorithm. This probe does not necessarily fire for every discarded IP fragment because some algorithms, notably the algorithm in RFC 815, can lose track of fragments by combining them as they are received.
ipReasmOKs	Fires whenever an IP datagram is successfully reassembled.
ipReasmPartDups	Fires whenever the IP reassembly algorithm determines that an IP fragment contains both some previously received data and some new data.
ipReasmReqds	Fires whenever an IP fragment is received that needs to be reassembled.

Table 11-14 IPsec mib Probes

Probe	Description
ipsecInFailed	Fires whenever a received packet is dropped because it fails to match the specified IPsec policy.
ipsecInSucceeded	Fires whenever a received packet matches the specified IPsec policy and processing is allowed to continue.

Table 11-15 IPv6 mib Probes

Probe	Description
ipv6ForwProhibits	Fires whenever an IPv6 datagram is received that does not have this machine as its final IPv6 destination, but because the machine is not permitted to act as a router, no attempt is made to find a route to forward the datagram to that final destination.
ipv6IfIcmpBadHoplimit	Fires whenever an ICMPv6 neighbor discovery protocol message is received that is found to have a Hop Limit less than the defined maximum. Such messages might not have originated from a neighbor, and are therefore discarded.
ipv6IfIcmpInAdminProhibs	Fires whenever an ICMPv6 Destination Unreachable (Communication Administratively Prohibited) message is received.
ipv6IfIcmpInBadNeighborAdvertisements	Fires whenever an ICMPv6 Neighbor Advertisement message is received that is malformed in some way.
ipv6IfIcmpInBadNeighborSolicitations	Fires whenever an ICMPv6 Neighbor Solicit message is received that is malformed in some way.
ipv6IfIcmpInBadRedirects	Fires whenever an ICMPv6 Redirect message is received that is malformed in some way.
ipv6IfIcmpInDestUnreachs	Fires whenever an ICMPv6 Destination Unreachable message is received.
ipv6IfIcmpInEchoReplies	Fires whenever an ICMPv6 Echo Reply message is received.
ipv6IfIcmpInEchos	Fires whenever an ICMPv6 Echo request message is received.
ipv6IfIcmpInErrors	Fires whenever an ICMPv6 message is received that is determined to have an ICMPv6-specific error (such as bad ICMPv6 checksum, bad length, and the like).
ipv6IfIcmpInGroupMembBadQueries	Fires whenever an ICMPv6 Group Membership Query message is received that is malformed in some way.
ipv6IfIcmpInGroupMembBadReports	Fires whenever an ICMPv6 Group Membership Report message is received that is malformed in some way.
ipv6IfIcmpInGroupMembOurReports	Fires whenever an ICMPv6 Group Membership Report message is received.
ipv6IfIcmpInGroupMembQueries	Fires whenever an ICMPv6 Group Membership Query message is received.
ipv6IfIcmpInGroupMembReductions	Fires whenever an ICMPv6 Group Membership Reduction message is received.
ipv6IfIcmpInGroupMembResponses	Fires whenever an ICMPv6 Group Membership Response message is received.
ipv6IfIcmpInGroupMembTotal	Fires whenever an ICMPv6 multicast listener discovery message is received.
ipv6IfIcmpInMsgs	Fires whenever an ICMPv6 message is received. When this probe fires, the ipv6IfIcmpInErrors probe might also fire if the message has an ICMPv6-specific error.
ipv6IfIcmpInNeighborAdvertisements	Fires whenever an ICMPv6 Neighbor Advertisement message is received.
ipv6IfIcmpInNeighborSolicits	Fires whenever an ICMPv6 Neighbor Solicit message is received.
ipv6IfIcmpInOverflows	Fires whenever an ICMPv6 message is received, but that message is subsequently dropped due to lack of buffer space.
ipv6IfIcmpInParmProblems	Fires whenever an ICMPv6 Parameter Problem message is received.
ipv6IfIcmpInRedirects	Fires whenever an ICMPv6 Redirect message is received.
ipv6IfIcmpInRouterAdvertisements	Fires whenever an ICMPv6 Router Advertisement message is received.
ipv6IfIcmpInRouterSolicits	Fires whenever an ICMPv6 Router Solicit message is received.
ipv6IfIcmpInTimeExcds	Fires whenever an ICMPv6 Time Exceeded message is received.
ipv6IfIcmpOutAdminProhibs	Fires whenever an ICMPv6 Destination Unreachable (Communication Administratively Prohibited) message is sent.
ipv6IfIcmpOutDestUnreachs	Fires whenever an ICMPv6 Destination Unreachable message is sent.
ipv6IfIcmpOutEchoReplies	Fires whenever an ICMPv6 Echo Reply message is sent.
ipv6IfIcmpOutEchos	Fires whenever an ICMPv6 Echo message is sent.
ipv6IfIcmpOutErrors	Fires whenever an ICMPv6 message is not sent due to problems discovered within ICMPv6, such as a lack of buffers. This probe will not fire if errors are discovered outside the ICMPv6 layer, such as the inability of IPv6 to route the resulting datagram.
ipv6IfIcmpOutGroupMembQueries	Fires whenever an ICMPv6 Group Membership Query message is sent.
ipv6IfIcmpOutGroupMembReductions	Fires whenever an ICMPv6 Group Membership Reduction message is sent.
ipv6IfIcmpOutGroupMembResponses	Fires whenever an ICMPv6 Group Membership Response message is sent.
ipv6IfIcmpOutMsgs	Fires whenever an ICMPv6 message is sent. When this probe fires, the ipv6IfIcmpOutErrors probe might also fire if the message has ICMPv6-specific errors.
ipv6IfIcmpOutNeighborAdvertisements	Fires whenever an ICMPv6 Neighbor Advertisement message is sent.
ipv6IfIcmpOutNeighborSolicits	Fires whenever an ICMPv6 Neighbor Solicitation message is sent.
ipv6IfIcmpOutParmProblems	Fires whenever an ICMPv6 Parameter Problem message is sent.
ipv6IfIcmpOutPktTooBigs	Fires whenever an ICMPv6 Packet Too Big message is sent.
ipv6IfIcmpOutRedirects	Fires whenever an ICMPv6 Redirect message is sent. For a host, this probe will never fire, because hosts do not send redirects.
ipv6IfIcmpOutRouterAdvertisements	Fires whenever an ICMPv6 Router Advertisement message is sent.
ipv6IfIcmpOutRouterSolicits	Fires whenever an ICMPv6 Router Solicit message is sent.
ipv6IfIcmpOutTimeExcds	Fires whenever an ICMPv6 Time Exceeded message is sent.
ipv6InAddrErrors	Fires whenever an input datagram is discarded because the IPv6 address in their IPv6 header's destination field is not a valid address to be received by this entity. This probe will fire for invalid addresses (for example, ::0) and for unsupported addresses (for example, addresses with unallocated prefixes). For machines that are not configured to act as IPv6 routers and therefore do not forward datagrams, this probe will fire for datagrams discarded because the destination address was not a local address.
ipv6InDelivers	Fires whenever an input datagram is successfully delivered to IPv6 user-protocols (including ICMPv6).
ipv6InDiscards	Fires whenever an input IPv6 datagram is discarded for reasons unrelated to the packet (for example, for lack of buffer space). This probe does not fire for any datagram discarded while awaiting reassembly.
ipv6InHdrErrors	Fires whenever an input datagram is discarded due to an error in its IPv6 header, including a version number mismatch, a format error, an exceeded hop count, an error discovered in processing IPv6 options, and the like.
ipv6InIPv4	Fires whenever an IPv4 packet erroneously arrives on an IPv6 queue.
ipv6InMcastPkts	Fires whenever a multicast IPv6 packet is received.
ipv6InNoRoutes	Fires whenever a routed IPv6 datagram is discarded because no route could be found to transmit it to its destination. This probe will only fire for packets that have originated externally.
ipv6InReceives	Fires whenever an IPv6 datagram is received from an interface, even if that datagram is received in error.
ipv6InTooBigErrors	Fires whenever a fragment is received that is larger than the maximum fragment size.
ipv6InTruncatedPkts	Fires whenever an input datagram is discarded because the datagram frame did not carry enough data.
ipv6InUnknownProtos	Fires whenever a locally-addressed IPv6 datagram is received successfully but subsequently discarded because of an unknown or unsupported protocol.
ipv6OutDiscards	Fires whenever an output IPv6 datagram is discarded for reasons unrelated to the packet (for example, for lack of buffer space). This probe will fire for a packet counted in the ipv6OutForwDatagrams MIB counter if the packet meets such a (discretionary) discard criterion.
ipv6OutForwDatagrams	Fires whenever a datagram is received that does not have this machine as its final IPv6 destination, and an attempt is made to find a route to forward the datagram to that final destination. On a machine that does not act as an IPv6 router, this probe will only fire for those packets that are source-routed through the machine, and for which the source-route option processing was successful.
ipv6OutFragCreates	Fires whenever an IPv6 datagram fragment is generated as a result of fragmentation.
ipv6OutFragFails	Fires whenever an IPv6 datagram is discarded because it could not be fragmented, for example, because its Do not Fragment flag was set.
ipv6OutFragOKs	Fires whenever an IPv6 datagrams has been successfully fragmented.
ipv6OutIPv4	Fires whenever an IPv6 packet is sent over an IPv4 connection.
ipv6OutMcastPkts	Fires whenever a multicast packet is sent.
ipv6OutNoRoutes	Fires whenever an IPv6 datagram is discarded because no route could be found to transmit it to its destination. This probe will not fire for packets that have originated externally.
ipv6OutRequests	Fires whenever an IPv6 datagram is supplied to IPv6 for transmission from local IPv6 user protocols (including ICMPv6). This probe will not fire for any packet counted in the ipv6ForwDatagrams MIB counter.
ipv6OutSwitchIPv4	Fires whenever a connection changes from using IPv6 to using IPv4 as its IP protocol.
ipv6ReasmDuplicates	Fires whenever the IPv6 reassembly algorithm determines that an IPv6 fragment contains only previously received data.
ipv6ReasmFails	Fires whenever a failure is detected by the IPv6 reassembly algorithm. This probe does not necessarily fire for every discarded IPv6 fragment since some algorithms can lose track of fragments by combining them as they are received.
ipv6ReasmOKs	Fires whenever an IPv6 datagram is successfully reassembled.
ipv6ReasmPartDups	Fires whenever the IPv6 reassembly algorithm determines that an IPv6 fragment contains both some previously received data and some new data.
ipv6ReasmReqds	Fires whenever an IPv6 fragment is received that needs to be reassembled.

Table 11-16 Raw IP mib Probes

Probe	Description
rawipInCksumErrs	Fires whenever a raw IP packet is received that has a bad IP checksum.
rawipInDatagrams	Fires whenever a raw IP packet is received.
rawipInErrors	Fires whenever a raw IP packet is received that is malformed in some way.
rawipInOverflows	Fires whenever a raw IP packet is received, but that packet is subsequently dropped due to lack of buffer space.
rawipOutDatagrams	Fires whenever a raw IP packet is sent.
rawipOutErrors	Fires whenever a raw IP packet is not sent due to some error condition, typically because the raw IP packet was malformed in some way.

Table 11-17 SCTP mib Probes

Probe	Description
sctpAborted	Fires whenever an SCTP association has made a direct transition to the CLOSED state from any state using the ABORT primitive, denoting ungraceful termination of the association.
sctpActiveEstab	Fires whenever an SCTP association has made a direct transition to the ESTABLISHED state from the COOKIE-ECHOED state, denoting that the upper layer has initiated the association attempt.
sctpChecksumError	Fires whenever an SCTP packet is received from peers with an invalid checksum.
sctpCurrEstab	Fires whenever an SCTP association is tallied as a part of reading the sctpCurrEstab MIB counter. An SCTP association is tallied if its current state is ESTABLISHED, SHUTDOWN-RECEIVED, or SHUTDOWN-PENDING.
sctpFragUsrMsgs	Fires whenever a user message has to be fragmented because of the MTU.
sctpInClosed	Fires whenever data is received on a closed SCTP association.
sctpInCtrlChunks	Fires whenever the sctpInCtrlChunks MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpInDupAck	Fires whenever a duplicate ACK is received.
sctpInInvalidCookie	Fires whenever an invalid cookie is received.
sctpInOrderChunks	Fires whenever the sctpInOrderChunks MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpInSCTPPkts	Fires whenever the sctpInSCTPPkts MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpInUnorderChunks	Fires whenever the sctpInUnorderChunks MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpListenDrop	Fires whenever an incoming connection is dropped for any reason.
sctpOutAck	Fires whenever a selective acknowledgement is sent.
sctpOutAckDelayed	Fires whenever delayed acknowledgement processing is performed for an SCTP association. Any acknowledgements sent as a part of delayed acknowledgement processing will cause the sctpOutAck probe to fire.
sctpOutCtrlChunks	Fires whenever the sctpOutCtrlChunks MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpOutOfBlue	Fires whenever an otherwise correct SCTP packet is received for which the receiver is not able to identify the association to which the packet belongs.
sctpOutOrderChunks	Fires whenever the sctpOutOrderChunks MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in aRgs[0].
sctpOutSCTPPkts	Fires whenever the sctpOutSCTPPkts MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpOutUnorderChunks	Fires whenever the sctpOutUnorderChunks MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpOutWinProbe	Fires whenever a window probe is sent.
sctpOutWinUpdate	Fires whenever a window update is sent.
sctpPassiveEstab	Fires whenever SCTP associations have made a direct transition to the ESTABLISHED state from the CLOSED state. The remote endpoint has initiated the association attempt.
sctpReasmUsrMsgs	Fires whenever the sctpReasmUsrMsgs MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpRetransChunks	Fires whenever the sctpRetransChunks MIB counter is updated, either because the MIB counter is explicitly queried or because an SCTP connection is closed. The value by which the MIB counter is to be increased is in args[0].
sctpShutdowns	Fires whenever an SCTP association makes the direct transition to the CLOSED state from either the SHUTDOWN-SENT state or the SHUTDOWN-ACK-SENT state, denoting graceful termination of the association.
sctpTimHeartBeatDrop	Fires whenever an SCTP association is aborted due to failure to receive a heartbeat acknowledgement.
sctpTimHeartBeatProbe	Fires whenever an SCTP heartbeat is sent.
sctpTimRetrans	Fires whenever timer-based retransmit processing is performed on an association.
sctpTimRetransDrop	Fires whenever prolonged failure to perform timer-based retransmission results in the association being aborted.

Table 11-18 TCP mib Probes

Probe	Description
tcpActiveOpens	Fires whenever a TCP connection makes a direct transition from the CLOSED state to the SYN_SENT state.
tcpAttemptFails	Fires whenever a TCP connection makes a direct transition to the CLOSED state from either the SYN_SENT state or the SYN_RCVD state and whenever a TCP connection makes a direct transition to the LISTEN state from the SYN_RCVD state.
tcpCurrEstab	Fires whenever a TCP connection is tallied as a part of reading the tcpCurrEstab MIB counter. A TCP connection is tallied if its current state is either ESTABLISHED or CLOSE_WAIT.
tcpEstabResets	Fires whenever a TCP connection makes the direct transition to the CLOSED state from either the ESTABLISHED state or the CLOSE_WAIT state.
tcpHalfOpenDrop	Fires whenever a connection is dropped due to a full queue of connections in the SYN_RCVD state.
tcpInAckBytes	Fires whenever an ACK is received for previously sent data. The number of bytes acknowledged is passed in args[0].
tcpInAckSegs	Fires whenever an ACK is received for a previously sent segment.
tcpInAckUnsent	Fires whenever an ACK is received for an unsent segment.
tcpInClosed	Fires whenever data was received for a connection in a closing state.
tcpInDataDupBytes	Fires whenever a segment is received such that all data in the segment has been previously received. The number of bytes in the duplicated segment is passed in args[0].
tcpInDataDupSegs	Fires whenever a segment is received such that all data in the segment has been previously received. The number of bytes in the duplicated segment is passed in args[0].
tcpInDataInorderBytes	Fires whenever data is received such that all data prior to the new data's sequence number has been previously received. The number of bytes received in-order is passed in args[0].
tcpInDataInorderSegs	Fires whenever a segment is received such that all data prior to the new segment's sequence number has been previously received.
tcpInDataPartDupBytes	Fires whenever a segment is received such that some of the data in the segment has been previously received, but some of the data in the segment is new. The number of duplicate bytes is passed in args[0].
tcpInDataPartDupSegs	Fires whenever a segment is received such that some of the data in the segment has been previously received, but some of the data in the segment is new. The number of duplicate bytes is passed in args[0].
tcpInDataPastWinBytes	Fires whenever data is received that lies past the current receive window. The number of bytes is in args[0].
tcpInDataPastWinSegs	Fires whenever a segment is received that lies past the current receive window.
tcpInDataUnorderBytes	Fires whenever data is received such that some data prior to the new data's sequence number is missing. The number of bytes received unordered is passed in args[0].
tcpInDataUnorderSegs	Fires whenever a segment is received such that some data prior to the new data's sequence number is missing.
tcpInDupAck	Fires whenever a duplicate ACK is received.
tcpInErrs	Fires whenever a TCP error (for example, a bad TCP checksum) is found on a received segment.
tcpInSegs	Fires whenever a segment is received, even if that segment is later found to have an error that prevents further processing.
tcpInWinProbe	Fires whenever a window probe is received.
tcpInWinUpdate	Fires whenever a window update is received.
tcpListenDrop	Fires whenever an incoming connection is dropped due to a full listen queue.
tcpListenDropQ0	Fires whenever a connection is dropped due to a full queue of connections in the SYN_RCVD state.
tcpOutAck	Fires whenever an ACK is sent.
tcpOutAckDelayed	Fires whenever an ACK is sent after having been initially delayed.
tcpOutControl	Fires whenever a SYN, FIN, or RST is sent.
tcpOutDataBytes	Fires whenever data is sent. The number of bytes sent is in args[0].
tcpOutDataSegs	Fires whenever a segment is sent.
tcpOutFastRetrans	Fires whenever a segment is retransmitted as part of the fast retransmit algorithm.
tcpOutRsts	Fires whenever a segment is sent with the RST flag set.
tcpOutSackRetransSegs	Fires whenever a segment is retransmitted on a connection that has selective acknowledgement enabled.
tcpOutSegs	Fires whenever a segment is sent that contains at least one non-retransmitted byte.
tcpOutUrg	Fires whenever a segment is sent with the URG flag set, and with a valid urgent pointer.
tcpOutWinProbe	Fires whenever a window probe is sent.
tcpOutWinUpdate	Fires whenever a window update is sent.
tcpPassiveOpens	Fires whenever a TCP connections have made a direct transition to the SYN_RCVD state from the LISTEN state.
tcpRetransBytes	Fires whenever data is retransmitted. The number of bytes retransmitted is in args[0].
tcpRetransSegs	Fires whenever a segment is sent that contains one or more retransmitted bytes.
tcpRttNoUpdate	Fires whenever data was received, but there was no timestamp information available with which to update the RTT.
tcpRttUpdate	Fires whenever data was received containing the timestamp information necessary to update the RTT.
tcpTimKeepalive	Fires whenever timer-based keep-alive processing is performed on a connection.
tcpTimKeepaliveDrop	Fires whenever keep-alive processing results in termination of a connection.
tcpTimKeepaliveProbe	Fires whenever a keep-alive probe is sent out as a part of keep-alive processing.
tcpTimRetrans	Fires whenever timer-based retransmit processing is performed on a connection.
tcpTimRetransDrop	Fires whenever prolonged failure to perform timer-based retransmission results in termination of the connection.

Table 11-19 UDP mib Probes

Probe	Description
udpInCksumErrs	Fires whenever a datagram is discarded due to a bad UDP checksum.
udpInDatagrams	Fires whenever a UDP datagram is received.
udpInErrors	Fires whenever a UDP datagram is received, but is discarded due to either a malformed packet header or the failure to allocate an internal buffer.
udpInOverflows	Fires whenever a UDP datagram is received, but subsequently dropped due to lack of buffer space.
udpNoPorts	Fires whenever a UDP datagram is received on a port to which no socket is bound.
udpOutDatagrams	Fires whenever a UDP datagram is sent.
udpOutErrors	Fires whenever a UDP datagram is not sent due to some error condition, typically because the datagram was malformed in some way.