MIB2

# IP

Forwarding. Indicates whether or not this entity is acting as an IP gateway with respect to the forwarding of datagrams received by, but not addressed to, the entity. IP gateways forward datagrams. IP hosts do not (except those source-routed via the host). Note that for some managed nodes, this object may take on only a subset of the possible values. Accordingly, it is appropriate for an agent to return a 'badValue' response if a management station attempts to change this object to an inappropriate value.

DefaultTTL. The default value inserted into the Time-To-Live field of the IP header of datagrams originated at this entity, whenever a TTL value is not supplied by the transport layer protocol.

ReasmTimeout. The maximum number of seconds that received fragments are held while they are awaiting reassembly at this entity.

ARPLifeTime. The lifetime of an ARP entry within the system.

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# IP Address

Addr. The IP address to which this entry's addressing information pertains.

Interface. The index value that uniquely identifies the interface to which this entry is applicable. The interface identified by a particular value of this index is the same interface as identified by the value of ifIndex.

NetMask. The subnet mask associated with the IP address of this entry. The value of the mask is an IP address with all the network bits set to 1 and all the hosts bits set to 0.

BcastAddr. The value of the least-significant bit in the IP broadcast address used for sending datagrams on the (logical) interface associated with the IP address of this entry. For example, when the Internet standard all-ones broadcast address is used, the value will be 1. This value applies to both the subnet and network broadcasts addresses used by the entity on this (logical) interface.

ReasmMaxSize. The size of the largest IP datagram that this entity can re-assemble from incoming IP fragmented datagrams received on the interface.

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# IP Route

Dest. The destination IP address of this route. An entry with a value of 0.0.0.0 is considered a default route. Multiple routes to a single destination can appear in the table, but access to such multiple entries is dependent on the table-access mechanisms defined by the network management protocol in use.

Mask. Indicates the mask to be logical-ANDed with the destination address before being compared to the value in the ipRouteDest field. For those systems that do not support arbitrary subnet masks, an agent constructs the value of the ipRouteMask by determining whether the value of the correspondent ipRouteDest field belongs to a class A, B, or C network.

Interface. The index value that uniquely identifies the local interface through which the next hop of this route should be reached. The interface identified by a particular value of this index is the same interface as identified by the same value of ifIndex.

NextHop. The IP address of the next hop of this route. (In the case of a route bound to an interface realized via a broadcast media, the value of this field is the agent's IP address on that interface.)

Type. The type of route. Note that the values direct(3) and indirect(4) refer to the notion of direct and indirect routing in the IP architecture. Setting this object to the value invalid(2) has the effect of invalidating the corresponding entry in the ipRouteTable object. That is, it effectively disassociates the destination identified with said entry from the route identified with the entry. It is implementation-specific as to whether or not the agent removes an invalidated entry from the table. Accordingly, management stations must be prepared to receive tabular information from agents that correspond to entries not currently in use. Proper interpretation of such entries requires examination of the relevant ipRouteType object.

Proto. The routing mechanism through which this route was learned. Inclusion of values for gateway routing protocols does not imply that hosts should support those protocols.

Age. The number of seconds since this route was last updated or otherwise determined to be correct. Note that no determination of "too old' can be implied except through knowledge of the routing protocol by which the route was learned.

HopOrMetric. The primary routing metric for this route. The semantics of this metric are determined by the routing-protocol specified in the route's ipRouteProto value. If this metric is not used, its value should be set to -1.

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# ARP

Interface. The interface on which this entry's equivalence is effective. The interface identified by a particular value of this index is the same interface as identified by the value of ifIndex.

MacAddress. The media-dependent `physical' address.

IpAddress. The IP Address corresponding to the media-dependent `physical' address.

Type. The type of mapping.

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# TCP

RtoAlgorithm. The algorithm used to determine the timeout value for retransmitting unacknowledged octets.

RtoMin. The minimum value permitted by a TCP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend upon the algorithm used to determine the retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the semantics of the LBOUND quantity described in RFC 793.

RtoMax. The maximum value permitted by a TCP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend upon the algorithm used to determine the retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the semantics of the UBOUND quantity described in RFC 793.

MaxConn. The limit on the total number of TCP connections the entity can support. In entities where the maximum number of connections is dynamic, this object should contain the value -1.

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# TCP Connections

State. The state of this TCP connection.

The only value which may be set by a management station is deleteTCB(12). Accordingly, it is appropriate for an agent to return a 'badValue' response if a management station attempts to set this object to any other value.

If a management station sets this object to the value deleteTCB(12), this has the effect of deleting the TCB (as defined in RFC 793) of the corresponding connection on the managed node, resulting in immediate termination of the connection.

As an implementation-specific option, an RST segment may be sent from the managed node to the other TCP endpoint (note however that RST segments are not sent reliably).

LocalAddress. The local IP address for this TCP connection. In the case of a connection in the listen state that is willing to accept connections for any IP interface associated with the node, the value 0.0.0.0 is used.

LocalPort. The local port number for this TCP connection.

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# UDP Listener

Address. The local IP address for this UDP listener. In the case of a UDP listener that is willing to accept datagrams for any IP interface associated with the node, the value 0.0.0.0 is used.

Port. The local port number for this UDP listener.

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# Edit Interface

Name. The textual name of the interface. By convention, this is "MediaType slot port".

Index. A unique value for each interface. Its value ranges between 1 and the value of ifNumber. The value for each interface must remain constant at least from one re-initialization of the entity's network management system to the next re-initialization.

Type. The type of interface.

Mtu. The size of the largest packet that can be sent/received on the interface, specified in octets.

Speed. An estimate of the interface's current bandwidth in bits per second.

PhysAddress. The interface's address at its protocol sub-layer. The interface's media-specific MIB must define the bit and byte ordering and format of the value contained by this object.

AdminStatus. The desired state of the interface. The testing(3) state indicates that no operational packets can be passed. When a managed system initializes, all interfaces start with ifAdminStatus in the down(2) state. As a result of either explicit management action or per configuration information retained by the managed system, ifAdminStatus is then changed to either the up(1) or testing(3) states, or remains in the down(2) state.

OperStatus. The current operational state of the interface. The testing(3) state indicates that no operational packets can be passed. If ifAdminStatus is down(2), then ifOperStatus should be down(2). If ifAdminStatus is changed to up(1), then ifOperStatus should change to up(1) if the interface is ready to transmit and receive network traffic; it should remain in the down(2) state if and only if there is a fault that prevents if from going to the up(1) state.

LastChange. The value of sysUpTime at the time the interface entered its current operational state. If the current state was entered prior to the last re-initialization of the local network management subsystem, then this object contains a zero value.

LinkTrap. Indicates whether linkUp/linkDown traps should be generated for this interface.

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# Graph Interface

InOctets. The total number of octets received on the interface, including framing characters.

OutOctets. The total number of octets transmitted out of the interface, including framing characters.

InUcastPkts. The number of packets, delivered by this sublayer to a higher (sub)layer, that were not addressed to a multicast or broadcast address at this sublayer.

OutUcastPkts. The total number of packets that higher-level protocols requested be transmitted, and which were not addressed to a multicast or broadcast address at this sublayer, including those that were discarded or not sent.

InMulticastPkts. The number of packets, delivered by this sublayer to a higher (sub)layer, that were addressed to a multicast address at this sublayer. For a MAC layer protocol, this includes both Group and Functional addresses.

OutMulticastPkts. The total number of packets that higher-level protocols requested be transmitted and that were addressed to a multicast address at this sublayer, including those that were discarded or not sent. For a MAC layer protocol, this includes both Group and Functional addresses.

InNVCastPkts. The number of packets, delivered by this sublayer to a higher (sub)layer, that were addressed to a multicast or broadcast address at this sublayer. This object is deprecated in favor of ifInMulticastPkts and ifInBroadcastPkts.

OutNVCastPkts. The total number of packets that higher-level protocols requested be transmitted and that were addressed to a multicast or broadcast address at this sublayer, including those that were discarded or not sent.
This object is deprecated in favor of ifOutMulticastPkts and ifOutBroadcastPkts.

InBroadcastPkts. The number of packets, delivered by this sublayer to a higher (sub)layer, that were addressed to a broadcast address at this sublayer.

OutBroadcastPkts. The total number of packets that higher-level protocols requested be transmitted and that were addressed to a broadcast address at this sublayer, including those that were discarded or not sent.

InDiscards. The number of inbound packets that were chosen to be discarded, even though no errors had been detected to prevent their being deliverable to a higher-layer protocol. One possible reason for discarding such a packet could be to free up buffer space.

OutDiscards. The number of outbound packets that were chosen to be discarded, even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space.

InErrors. For packet-oriented interfaces, the number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol. For character-oriented or fixed-length interfaces, the number of inbound transmission units that contained errors preventing them from being deliverable to a higher-layer protocol.

OutErrors. For packet-oriented interfaces, the number of outbound packets that could not be transmitted because of errors. For character-oriented or fixed-length interfaces, the number of outbound transmission units that could not be transmitted because of errors.

InUnknownProtos. For packet-oriented interfaces, the number of packets received via the interface that were discarded because of an unknown or unsupported protocol. For character-oriented or fixed-length interfaces that support protocol multiplexing, the number of transmission units received via the interface that were discarded because of an unknown or unsupported protocol. For any interface that does not support protocol multiplexing, this counter will always be 0.

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# Graph SNMP

InPkts. The total number of Messages delivered to the SNMP entity from the transport service.

OutPkts. The total number of SNMP messages that were passed from the SNMP protocol entity to the transport service.

InTotalReqVars. The total number of MIB objects that have been retrieved successfully by the SNMP protocol entity as the result of receiving valid SNMP Get-Request and Get-Next PDUs.

InTotalSetVars. The total number of MIB objects that have been altered successfully by the SNMP protocol entity as the result of receiving valid SNMP Set-Request PDUs.

InGetRequests. The total number of SNMP Get-Request PDUs that have been accepted and processed by the SNMP protocol entity.

InGetNexts. The total number of SNMP Get-Next PDUs that have been accepted and processed by the SNMP protocol entity.

InSetRequests. The total number of SNMP Set-Request PDUs that have been accepted and processed by the SNMP protocol entity.

InGetResponses. The total number of SNMP Get-Response PDUs that have been accepted and processed by the SNMP protocol entity.

OutTraps. The total number of SNMP Trap PDUs that have been generated by the SNMP protocol entity.

OutTooBigs. The total number of SNMP PDUs that were generated by the SNMP protocol entity and for which the value of the error-status field is 'tooBig.'

OutNoSuchNames. The total number of SNMP PDUs that were generated by the SNMP protocol entity and for which the value of the error-status is 'noSuchName.'

OutBadValues. The total number of SNMP PDUs that were generated by the SNMP protocol entity and for which the value of the error-status field is 'badValue.'

OutGenErrs. The total number of SNMP PDUs that were generated by the SNMP protocol entity and for which the value of the error-status field is 'genErr.'

InBadVersions. The total number of SNMP Messages that were delivered to the SNMP protocol entity and were for an unsupported SNMP version.

InBadCommunityNames. The total number of SNMP Messages delivered to the SNMP protocol entity that used an SNMP community name not known to said entity.

InBadCommunityUses. The total number of SNMP Messages delivered to the SNMP protocol entity that represented an SNMP operation that was not allowed by the SNMP community named in the Message.

InASNParseErrs. The total number of ASN.1 or BER errors encountered by the SNMP protocol entity when decoding received SNMP Messages.

InTooBigs. The total number of SNMP PDUs that were delivered to the SNMP protocol entity and for which the value of the error-status field is 'tooBig.'

InNoSuchNames. The total number of SNMP PDUs that were delivered to the SNMP protocol entity and for which the value of the error-status field is 'noSuchName.'

InBadValues. The total number of SNMP PDUs that were delivered to the SNMP protocol entity and for which the value of the error-status field is 'badValue.'

InReadOnlys. The total number valid SNMP PDUs that were delivered to the SNMP protocol entity and for which the value of the error-status field is 'readOnly.' It should be noted that it is a protocol error to generate an SNMP PDU that contains the value 'readOnly' in the error-status field, as this object is provided as a means of detecting incorrect implementations of the SNMP.

InGenErrs. The total number of SNMP PDUs that were delivered to the SNMP protocol entity and for which the value of the error-status field is 'genErr.'

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# Graph IP

InReceives. The total number of input datagrams received from interfaces, including those received in error.

InHdrErrors. The number of input datagrams discarded due to errors in their IP headers, including bad checksums, version number mismatch, other format errors, time-to-live exceeded, errors discovered in processing their IP options, etc.

InAddrErrors. The number of input datagrams discarded because the IP address in their IP header's destination field was not a valid address to be received at this entity. This count includes invalid addresses (e.g., 0.0.0.0) and addresses of unsupported Classes (e.g., Class E). For entities that are not IP Gateways and therefore do not forward datagrams, this counter includes datagrams discarded because the destination address was not a local address.

ForwDatagrams. The number of input datagrams for which this entity was not their final IP destination, as a result of which an attempt was made to find a route to forward them to that final destination. In entities that do not act as IP Gateways, this counter will include only those packets that were source-routed via this entity, and the source-route option processing was successful.

InUnknownProtos. The number of locally addressed datagrams received successfully but discarded because of an unknown or unsupported protocol.

InDiscards. The number of input IP datagrams for which no problems were encountered to prevent their continued processing, but which were discarded (e.g., for lack of buffer space). Note that this counter does not include any datagrams discarded while awaiting reassembly.

InDelivers. The total number of input datagrams successfully delivered to IP user-protocols (including ICMP).

OutRequests. The total number of IP datagrams that local IP user-protocols (including ICMP) supplied to IP in requests for transmission. Note that this counter does not include any datagrams counted in ipForwDatagrams.

OutDiscards. The number of output IP datagrams for which no problem was encountered to prevent their transmission to their destination, but which were discarded (e.g., for lack of buffer space). Note that this counter would include datagrams counted in ipForwDatagrams if any such packets met this (discretionary) discard criterion.

OutNoRoutes. The number of IP datagrams discarded because no route could be found to transmit them to their destination. Note that this counter includes any packets counted in ipForwDatagrams which meet this 'no-route' criterion. Note that this includes any datagrams which a host cannot route because all of its default gateways are down.

FragOKs. The number of IP datagrams that have been successfully fragmented at this entity.

FragFails. The number of IP datagrams that have been discarded because they needed to be fragmented at this entity but could not be, e.g., because their Don't Fragment flag was set.

FragCreates. The number of IP datagram fragments that have been generated as a result of fragmentation at this entity.

ReasmReqds. The number of IP fragments received that needed to be reassembled at this entity.

ReasmOKs. The number of IP datagrams successfully reassembled.

ReasmFails. The number of failures detected by the IP reassembly algorithm (for whatever reason: timed out, errors, etc.). Note that this is not necessarily a count of discarded IP fragments since some algorithms (notably the algorithm in RFC 815) can lose track of the number of fragments by combining them as they are received.

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# Graph ICMP In

SrcQuenchs. The number of ICMP Source Quench messages received.

Redirects. The number of ICMP Redirect messages received.

Echos. The number of ICMP Echo (Request) messages received.

EchoReps. The number of ICMP Echo Reply messages received.

Timestamps. The number of ICMP Timestamp (Request) messages received.

TimestampReps. The number of ICMP Timestamp Reply messages received.

AddrMasks. The number of ICMP Address Mask Request messages received.

AddrMaskReps. The number of ICMP Address Mask Reply messages received.

ParmProbs. The number of ICMP Parameter Problem messages received.

DestUnreachs. The number of ICMP Destination Unreachable messages received.

TimeExcds. The number of ICMP Time Exceeded messages received.

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# Graph ICMP Out

SrcQuenchs. The number of ICMP Source Quench messages sent.

Redirects. The number of ICMP Redirect messages sent. For a host, this object will always be zero, since hosts do not send redirects.

Echos. The number of ICMP Echo (Request) messages sent.

EchoReps. The number of ICMP Echo Reply messages sent.

Timestamps. The number of ICMP Timestamp (Request) messages sent.

TimestampReps. The number of ICMP Timestamp Reply messages sent.

AddrMasks. The number of ICMP Address Mask Request messages sent.

AddrMaskReps. The number of ICMP Address Mask Reply messages sent.

ParmProbs. The number of ICMP Parameter Problem messages sent.

DestUnreachs. The number of ICMP Destination Unreachable messages sent.

TimeExcds. The number of ICMP Time Exceeded messages received.

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# Graph TCP Traffic

InSegs. The total number of segments received, including those received in error. This count includes segments received on currently established connections.

OutSegs. The total number of segments sent, including those on current connections, but excluding those containing only retransmitted octets.

RetransSegs. The total number of segments retransmitted; that is, the number of TCP segments transmitted containing one or more previously transmitted octets.

ActiveOpens. The number of times TCP connections have made a direct transition to the SYN-SENT state from the CLOSED state.

PassiveOpens. The number of times TCP connections have made a direct transition to the SYN-RCVD state from the LISTEN state.

AttemptFails. The number of times TCP connections have made a direct transition to the CLOSED state from either the SYN-SENT state or the SYN-RCVD state, plus the number of times TCP connections have made a direct transition to the LISTEN state from the SYN-RCVD state.

EstabResets. The number of times TCP connections have made a direct transition to the CLOSED state from either the ESTABLISHED state or the CLOSE-WAIT state.

CurrEstab. The number of TCP connections for which the current state is either ESTABLISHED or CLOSE-WAIT.

InErrs. The total number of segments received in error (e.g., bad TCP checksums).

OutRsts. The number of TCP segments sent containing the RST flag.

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# Graph UDP Traffic

InDatagrams. The total number of UDP datagrams delivered to UDP users.

OutDatagrams. The total number of UDP datagrams sent from this entity.

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