使用 snmpwalk 进行 SNMP MIB 故障排除

Question

我有一个来自供应商的 MIB 文件，用于查询特定的（在本例中是业务关键的）软件。

当我根据snmptable请求执行操作时，我得到了MAGIC-MIB::queryRtTable: No entries响应，但是当我使用 wireshark 观察时，我可以看到 wireshark 正在发送响应。

以下是服务器在 wireshark 中发送的响应：

我对 MIB 的构造一无所知，因此我发布了希望与 MIB 相关的部分：

MAGIC-MIB DEFINITIONS ::= BEGIN

IMPORTS
        enterprises
                FROM RFC1155-SMI
        OBJECT-TYPE
                FROM RFC-1212  
        DisplayString
                FROM RFC1213-MIB;

magic         OBJECT IDENTIFIER ::= {enterprises 15687}
manage          OBJECT IDENTIFIER ::= {magic 2}
query           OBJECT IDENTIFIER ::= {magic 3}

queryRtTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF QueryRtEntry
             ACCESS  not-accessible
             STATUS  mandatory
             DESCRIPTION
                     "The list of loaded enterprise servers"
             ::= { query 3 }

          queryRtEntry OBJECT-TYPE
              SYNTAX  QueryRtEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "The enterprise server entry"
              INDEX   { entServerEntryIndex }
              ::= { queryRtTable 1 }

          QueryRtEntry ::=
              SEQUENCE {
                              entServerEntryIndex
                      INTEGER,
                              entServerHost
                      DisplayString,
                              entServerPort
                      INTEGER,
                               openedApplication
                      DisplayString , 
                               entPriority
                      INTEGER,
                               runningThreads
                      INTEGER,
                               peakThreads
                      INTEGER,
                               runningContexts
                      INTEGER,
                               peakContexts
                      INTEGER,
                               requestsServed
                      INTEGER,
                               executionErrors
                      INTEGER
              }

          entServerEntryIndex OBJECT-TYPE
              SYNTAX  INTEGER (1..100000)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "A unique identifier for an enterprise server"
              ::= { queryRtEntry 1 }

          entServerHost OBJECT-TYPE
              SYNTAX  DisplayString
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The enterprise's host name"
              ::= { queryRtEntry 2 }

           entServerPort OBJECT-TYPE
              SYNTAX  INTEGER 
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The enterprise server's port number"
              ::= { queryRtEntry 3 }

          openedApplication OBJECT-TYPE
              SYNTAX  DisplayString
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The application that is running on the enterprise server."
              ::= { queryRtEntry 4 }

           entPriority OBJECT-TYPE
              SYNTAX  INTEGER 
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The priority of the enterprise server"
              ::= { queryRtEntry 5 }

           runningThreads OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The enterprise server's running thread counter"
              ::= { queryRtEntry 6 } 

           peakThreads OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The enterprise server's peak thread counter"
              ::= { queryRtEntry 7 }

           runningContexts OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The enterprise server's running context counter"
              ::= { queryRtEntry 8 } 

           peakContexts OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The enterprise server's peak context counter"
              ::= { queryRtEntry 9 }

           requestsServed OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of requests served"
              ::= { queryRtEntry 10 }

           executionErrors OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of execution errors"
              ::= { queryRtEntry 11 }   

有什么想法我应该去哪里查找为什么snmptable即使数据已发送，却没有返回任何数据？我猜这是 MIB 中的一个错误，但我真的不知道从哪里开始。

Answer 1

事实证明这是软件 SNMP 代理的一个错误，无论您请求哪个 OID，它总是返回同一个。这意味着，如果这是您想要收集的 OID，那很好 - 如果您想要任何其他数据，那就太糟糕了。