TCP/IP and Data Communications Administration Guide
Displaying Per Protocol Statistics

The netstat -s option displays per protocol statistics for the UDP, TCP, ICMP, and IP protocols. The result resembles the display shown in the example below. (Parts of the output have been truncated.) The information can indicate areas where a protocol is having problems. For example, statistical information from ICMP can indicate where this protocol has found errors.
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