rfc1158.txt

<VC++网络游戏建摸与实现>源代码

          Definition:
               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.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifOutErrors { ifEntry 20 }

          Syntax:
               Counter




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RFC 1158                         MIB II                         May 1990


          Definition:
               The number of outbound packets that could not be
               transmitted because of errors.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifOutQLen { ifEntry 21 }

          Syntax:
               Gauge

          Definition:
               The length of the output packet queue (in packets).

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifSpecific { ifEntry 22 }

          Syntax:
               OBJECT IDENTIFIER

          Definition:
               A reference to MIB definitions specific to the particular
               media being used to realize the interface.  For example,
               if the interface is realized by an ethernet, then the
               value of this object refers to a document defining
               objects specific to ethernet.  If an agent is not
               configured to have a value for any of these variables,
               the object identifier

                    nullSpecific OBJECT IDENTIFIER ::= { 0 0 }

               is returned.  Note that "nullSpecific" is a syntatically
               valid object identifier, and any conformant



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RFC 1158                         MIB II                         May 1990


               implementation of ASN.1 and BER must be able to generate
               and recognize this value.

          Access:
               read-only.

          Status:
               mandatory.

5.3.  The Address Translation Group

   Implementation of the Address Translation group is mandatory for all
   systems.  Note however that this group is deprecated by MIB-II.  That
   is, it is being included solely for compatibility with MIB-I nodes,
   and will most likely be excluded from MIB-III nodes.  From MIB-II and
   onwards, each network protocol group contains its own address
   translation tables.

   The Address Translation group contains one table which is the union
   across all interfaces of the translation tables for converting a
   NetworkAddress (e.g., an IP address) into a subnetwork-specific
   address.  For lack of a better term, this document refers to such a
   subnetwork-specific address as a "physical" address.

   Examples of such translation tables are: for broadcast media where
   ARP is in use, the translation table is equivalent to the ARP cache;
   or, on an X.25 network where non-algorithmic translation to X.121
   addresses is required, the translation table contains the
   NetworkAddress to X.121 address equivalences.


          OBJECT:
          -------
               atTable { at 1 }

          Syntax:
               SEQUENCE OF AtEntry

          Definition:
               The Address Translation tables contain the NetworkAddress
               to "physical" address equivalences.  Some interfaces do
               not use translation tables for determining address
               equivalences (e.g., DDN-X.25 has an algorithmic method);
               if all interfaces are of this type, then the Address
               Translation table is empty, i.e., has zero entries.

          Access:
               read-write.



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RFC 1158                         MIB II                         May 1990


          Status:
               deprecated.


          OBJECT:
          -------
               atEntry { atTable 1 }

          Syntax:
               AtEntry ::= SEQUENCE {
                    atIfIndex
                        INTEGER,
                    atPhysAddress
                        OCTET STRING,
                    atNetAddress
                        NetworkAddress
               }

          Definition:
               Each entry contains one NetworkAddress to "physical"
               address equivalence.

          Access:
               read-write.

          Status:
               deprecated.

          We now consider the individual components of each Address
          Translation table entry:


          OBJECT:
          -------
               atIfIndex { atEntry 1 }

          Syntax:
               INTEGER

          Definition:
               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 same value of ifIndex.

          Access:
               read-write.




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RFC 1158                         MIB II                         May 1990


          Status:
               deprecated.


          OBJECT:
          -------
               atPhysAddress { atEntry 2 }

          Syntax:
               OCTET STRING

          Definition:
               The media-dependent "physical" address.

          Setting this object to a null string (one of zero length) has
          the effect of invaliding the corresponding entry in the
          atTable object.  That is, it effectively disassociates the
          interface identified with said entry from the mapping
          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 atPhysAddress object.

          Access:
               read-write.

          Status:
               deprecated.


          OBJECT:
          -------
               atNetAddress { atEntry 3 }

          Syntax:
               NetworkAddress

          Definition:
               The NetworkAddress (e.g., the IP address) corresponding
               to the media-dependent "physical" address.

          Access:
               read-write.





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RFC 1158                         MIB II                         May 1990


          Status:
               deprecated.

5.4.  The IP Group

   Implementation of the IP group is mandatory for all systems.



          OBJECT:
          -------
               ipForwarding { ip 1 }

          Syntax:
               INTEGER {
                    forwarding(1),    -- i.e., acting as a gateway
                    not-forwarding(2) -- i.e., NOT acting as a gateway
               }

          Definition:
               The indication of whether this entity is acting as an IP
               gateway in respect to the forwarding of datagrams
               received by, but not addressed to, this entity.  IP
               gateways forward datagrams.  IP hosts do not (except
               those source-routed via the host).

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               ipDefaultTTL { ip 2 }

          Syntax:
               INTEGER

          Definition:
               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.

          Access:
               read-write.



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RFC 1158                         MIB II                         May 1990


          Status:
               mandatory.


          OBJECT:
          -------
               ipInReceives { ip 3 }

          Syntax:
               Counter

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

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInHdrErrors { ip 4 }

          Syntax:
               Counter

          Definition:
               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.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInAddrErrors { ip 5 }

          Syntax:
               Counter



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RFC 1158                         MIB II                         May 1990


          Definition:
               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.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipForwDatagrams { ip 6 }

          Syntax:
               Counter

          Definition:
               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.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInUnknownProtos { ip 7 }

          Syntax:
               Counter





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RFC 1158                         MIB II                         May 1990


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

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInDiscards { ip 8 }

          Syntax:
               Counter

          Definition:
               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.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInDelivers { ip 9 }

          Syntax: