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 which received fragments are held while they are awaiting reassembly at this entity.
ARPLifeTime. The lifetime of an ARP entry within the system.
Interface. The index value which 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 same 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 which this entity can re-assemble from incoming IP fragmented datagrams received on this interface.
VlanId. A value that uniquely identifies the Virtual LAN associated with this entry. This value corresponds to the lower 12 bits in the IEEE 802.1Q VLAN Tag.
BrouterPort. Used to indicate whether this entry correponds to a brouter port (as oppose to a routable VLAN). This value cannot be changed after the row is created.
Interface. The index value which 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 which is 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 dissasociates the destination identified with said entry from the route identified with said entry. It is an implementation-specific matter as to whether the agent removes an invalidated entry from the table. Accordingly, management stations must be prepared to receive tabular information from agents that corresponds to entries not currently in use. Proper interpretation of such entries requires examination of the relevant ipRouteType object.
Proto. The routing mechanism via which this route was learned. Inclusion of values for gateway routing protocols is not intended to 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 semantics of `too old' can be implied except through knowledge of the routing protocol by which the route was learned.
Mask. Indicate 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 belong to a class-A, B, or C network.
Hops. 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.
Mask. Indicate the mask to be logical-ANDed with the destination address before being compared to the value in the rcIpRouteDest field. For those systems that do not support arbitrary subnet masks, an agent constructs the value of the rcIpRouteMask by determining whether the value of the correspondent rcIpRouteDest field belong to a class-A, B, or C network, and then using one of: mask network 255.0.0.0 class-A 255.255.0.0 class-B 255.255.255.0 class-C If the value of the rcIpRouteDest is 0.0.0.0 (a default route), then the mask value is also 0.0.0.0. It should be noted that all IP routing subsystems implicitly use this mechanism.
NextHop. The IP address of the next hop of this route. (In the case of a route bound to an interface which is realized via a broadcast media, the value of this field is the agent's IP address on that interface).
Metric. The primary routing metric for this route. The semantics of this metric are determined by the routing-protocol specified in the route's rcIpRouteProto value. If this metric is not used, its value should be set to -1.
IfIndex. The index value which 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.
Preference. Used to indicate the route preference of this entry. If there are more than one route that can be used to forward IP traffic, the route that has a highest preference will be used instead of a lower preference one. The higher the number, the higher the preference.
Enable. Used to enable/disable this entry.
Status. Used to indicate the current status of this entry.
MacAddress. The media-dependent `physical' address.
IpAddress. The IpAddress corresponding to the media- dependent `physical' address.
Type. The type of mapping.
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.
If a management station sets this object to the value deleteTCB(12), then 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, a RST segment may be sent from
the managed node to the other TCP endpoint (note however that RST segments
are not sent reliably).
LocalPort. The local port number for this TCP connection.
Port. The local port number for this UDP listener.
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 which 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 change to dormant(5) if the interface is waiting for external actions (such as a serial line waiting for an incomming connection); 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.
OutOctets. The total number of octets transmitted out of the interface, including framing characters.
InUcastPkts. The number of packets, delivered by this sub-layer to a higher (sub-)layer, which were not addressed to a multicast or broadcast address at this sub-layer.
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 sub-layer, including those that were discarded or not sent.
InMulticastPkts. The number of packets, delivered by this sub-layer to a higher (sub-)layer, which were addressed to a multicast address at this sub-layer. 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 which were addressed to a multicast address at this sub-layer, 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 sub-layer to a higher (sub-)layer, which were addressed to a multicast or broadcast address at this sub-layer. This object is deprecated in favour of ifInMulticastPkts and ifInBroadcastPkts.
OutNVCastPkts. The total number of packets that higher-level
protocols requested be transmitted, and which were addressed to a multicast
or broadcast address at this sub-layer, including those that were discarded
or not sent.
This object is deprecated in favour of ifOutMulticastPkts and ifOutBroadcastPkts.
InBroadcastPkts. The number of packets, delivered by this sub-layer to a higher (sub-)layer, which were addressed to a broadcast address at this sub-layer.
OutBroadcastPkts. The total number of packets that higher-level protocols requested be transmitted, and which were addressed to a broadcast address at this sub-layer, including those that were discarded or not sent.
InDiscards. The number of inbound packets which 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 which 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 which were discarded because of an unknown or unsupported protocol. For character-oriented or fixed-length interfaces which support protocol multiplexing the number of transmission units received via the interface which were discarded because of an unknown or unsupported protocol. For any interface which does not support protocol multiplexing, this counter will always be 0.
NumStateTransition. Number of state transitions.
OutPkts. The total number of SNMP Messages which were passed from the SNMP protocol entity to the transport service.
InTotalReqVars. The total number of MIB objects which 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 which 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 which have been accepted and processed by the SNMP protocol entity.
InGetNexts. The total number of SNMP Get-Next PDUs which have been accepted and processed by the SNMP protocol entity.
InSetRequests. The total number of SNMP Set-Request PDUs which have been accepted and processed by the SNMP protocol entity.
InGetResponses. The total number of SNMP Get-Response PDUs which have been accepted and processed by the SNMP protocol entity.
OutTraps. The total number of SNMP Trap PDUs which have been generated by the SNMP protocol entity.
OutTooBigs. The total number of SNMP PDUs which 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 which 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 which 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 which 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 which 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 which used a SNMP community name not known to said entity.
InBadCommunityUses. The total number of SNMP Messages delivered to the SNMP protocol entity which represented an SNMP operation which 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 which 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 which 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 which 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 which 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 which contains the value `readOnly' in the error-status field, as such this object is provided as a means of detecting incorrect implementations of the SNMP.
InGenErrs. The total number of SNMP PDUs which were delivered to the SNMP protocol entity and for which the value of the error-status field is `genErr'.
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 which 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 which do not act as IP Gateways, this counter will include only those packets which 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 re-assembly.
InDelivers. The total number of input datagrams successfully delivered to IP user-protocols (including ICMP).
OutRequests. The total number of IP datagrams which 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 datagarms 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 which needed to be reassembled at this entity.
ReasmOKs. The number of IP datagrams successfully re- assembled.
ReasmFails. The number of failures detected by the IP re- assembly 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.
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.
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.
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.
OutDatagrams. The total number of UDP datagrams sent from this entity.