プロトコル別統計の表示

netstat -s オプションは、UDP、TCP、ICMP、IP プロトコルについて、プロトコル別の統計を表示します。結果は、下に示す出力例のように表示されます (出力の一部は省略してあります)。この情報には、プロトコルに問題のある箇所が示されることがあります。たとえば、ICMP からの統計情報には、このプロトコルがどこにエラーを検出したかを示すことがあります。

UDP

      udpInDatagrams      =  39228     udpOutDatagrams     =  2455
      udpInErrors         =     0

TCP

      tcpRtoAlgorithm     =     4      tcpMaxConn          =    -1
      tcpRtoMax           = 60000      tcpPassiveOpens     =     2
      tcpActiveOpens      =     4      tcpEstabResets      =     1
      tcpAttemptFails     =     3      tcpOutSegs          =   315
      tcpCurrEstab        =     1      tcpOutDataBytes     = 10547
      tcpOutDataSegs      =   288      tcpRetransBytes     =  8376
      tcpRetransSegs      =    29      tcpOutAckDelayed    =    23
      tcpOutAck           =    27      tcpOutWinUpdate     =     2
      tcpOutUrg           =     2      tcpOutControl       =     8
      tcpOutWinProbe      =     0      tcpOutFastRetrans   =     1
      tcpOutRsts          =     0
      tcpInSegs           =   563      tcpInAckBytes       = 10549
      tcpInAckSegs        =   289      tcpInAckUnsent      =     0
      tcpInDupAck         =    27      tcpInInorderBytes   =   673
      tcpInInorderSegs    =   254      tcpInInorderBytes   =   673
      tcpInUnorderSegs    =     0      tcpInUnorderBytes   =     0
      tcpInDupSegs        =     0      tcpInDupBytes       =     0
      tcpInPartDupSegs    =     0      tcpInPartDupBytes   =     0
      tcpInPastWinSegs    =     0      tcpInPastWinBytes   =     0
      tcpInWinProbe       =     0      tcpInWinUpdate      =   237
      tcpInClosed         =     0      tcpRttNoUpdate      =    21
      tcpRttUpdate        =   266      tcpTimRetrans       =    26
      tcpTimRetransDrop   =     0      tcpTimKeepalive     =     0
      tcpTimKeepaliveProbe=     0      tcpTimKeepaliveDrop =     0

IP
 
      ipForwarding        =     2      ipDefaultTTL        =   255
      ipInReceives        =  4518      ipInHdrErrors       =     0
      ipInAddrErrors      =     0      ipInCksumErrs       =     0
      ipForwDatagrams     =     0      ipForwProhibits     =     0
      ipInUnknownProtos   =     0      ipInDiscards        =     0
      ipInDelivers        =  4486      ipOutRequests       =  2805
      ipOutDiscards       =     5      ipOutNoRoutes       =     0
      ipReasmTimeout      =    60      ipReasmReqds        =     2
      ipReasmOKs          =     2      ipReasmReqds        =     2
      ipReasmDuplicates   =     0      ipReasmFails        =     0
      ipFragOKs           =    20      ipReasmPartDups     =     0
      ipFragCreates       =   116      ipFragFails         =     0
      tcpInErrs           =     0      ipRoutingDiscards   =     0
      udpInCksumErrs      =     0      udpNoPorts          =    33
      rawipInOverflows    =     0      udpInOverflows      =     6

ICMP

      icmpInMsgs          =     0      icmpInErrors        =     0
      icmpInCksumErrs     =     0      icmpInUnknowns      =     0
      icmpInDestUnreachs  =     0      icmpInTimeExcds     =     0
      icmpInParmProbs     =     0      icmpInSrcQuenchs    =     0
      icmpInRedirects     =     0      icmpInBadRedirects  =     0
      icmpInEchos         =     0      icmpInEchoReps      =     0
      icmpInTimestamps    =     0      icmpInTimestampReps =     0
      icmpInAddrMasks     =     0      icmpInAddrMaskReps  =     0
      icmpInFragNeeded    =     0      icmpOutMsgs         =     7
      icmpOutDestUnreachs =     1      icmpOutErrors       =     0
      icmpOutDrops        =     5      icmpOutTimeExcds    =     0
      icmpOutParmProbs    =     0      icmpOutSrcQuenchs   =     6
      icmpOutRedirects    =     0      icmpOutEchos        =     0
      icmpOutEchoReps     =     0      icmpOutTimestamps   =     0
      icmpOutTimestampReps=     0      icmpOutAddrMasks    =     0
      icmpOutAddrMaskReps =     0      icmpOutFragNeeded   =     0
      icmpInOverflows     =     0


IGMP:
 
0 messages received
0 messages received with too few bytes
0 messages received with bad checksum
0 membership queries received
0 membership queries received with invalid field(s)
0 membership reports received
0 membership reports received with invalid field(s)
0 membership reports received for groups to which we belong
0 membership reports sent