netstat -s统计输出的所有字段详细解释
今天工作上碰到一个问题需要知道udp的丢包数据。实际上我不相信能简单地得到udp的丢包精确数据。理由是，网卡负载太高时有些包连网卡都没收到，根本不可能来得及汇报给内核。另外，如果是路由器把udp丢了，那udp的目的端机器当然更不可能感知到有丢包了。 这时，同事说netstat -us (–statistic)可以看到udp的丢包。这里的u选项指的是只展示udp相关的统计，s选项自然表示的是统计了。如果不用u选项，则出显示所有统计数据。下面是我的机器上的输出。 Ip: 203440255187 total packets received 0 forwarded 0 incoming packets discarded 201612429535 incoming packets delivered 1064529177 requests sent out 15 fragments dropped after timeout 3058122492 reassemblies required 1230296840 packets reassembled ok 15 packet reassembles failed Icmp: 14869220 ICMP messages received 3965512 input ICMP message failed. ICMP input histogram: destination unreachable: 6054246 timeout in transit: 687 echo requests: 8570532 echo replies: 243755 12913011 ICMP messages sent 0 ICMP messages failed ICMP output histogram: destination unreachable: 4097869 time exceeded: 5 echo request: 244605 echo replies: 8570532 IcmpMsg: InType0: 243755 InType3: 6054246 InType8: 8570532 InType11: 687 OutType0: 8570532 OutType3: 4097869 OutType8: 244605 OutType11: 5 Tcp: 111681768 active connections openings 4186820 passive connection openings 24951865 failed connection attempts 55064041 connection resets received 275 connections established 1033901799 segments received 1776166765 segments send out 12156205 segments retransmited 6705 bad segments received. 106348033 resets sent Udp: 198894689917 packets received 472986510 packets to unknown port received. 1146976531 packet receive errors 116750744 packets sent 110301286 receive buffer errors 0 send buffer errors UdpLite: TcpExt: 423 invalid SYN cookies received 693 packets pruned from receive queue because of socket buffer overrun 19 packets pruned from receive queue 11309370 TCP sockets finished time wait in fast timer 106 packets rejects in established connections because of timestamp 10210477 delayed acks sent 20811 delayed acks further delayed because of locked socket Quick ack mode was activated 8856 times 17118697 packets directly queued to recvmsg prequeue. 301717551 bytes directly in process context from backlog 152118951904 bytes directly received in process context from prequeue 104771733 packet headers predicted 15179703 packets header predicted and directly queued to user 218747377 acknowledgments not containing data payload received 102637644 predicted acknowledgments 7293 times recovered from packet loss by selective acknowledgements Detected reordering 40 times using FACK Detected reordering 27 times using SACK Detected reordering 1088 times using time stamp 476 congestion windows fully recovered without slow start 5287 congestion windows partially recovered using Hoe heuristic 236 congestion windows recovered without slow start by DSACK 151673 congestion windows recovered without slow start after partial ack 1 timeouts after reno fast retransmit 4 timeouts after SACK recovery 10540 timeouts in loss state 7232 fast retransmits 649 forward retransmits 1871 retransmits in slow start 11612658 other TCP timeouts TCPLossProbes: 93185 TCPLossProbeRecovery: 14667 2431 packets collapsed in receive queue due to low socket buffer 8814 DSACKs sent for old packets 3350 DSACKs received 1 DSACKs for out of order packets received 90851 connections reset due to unexpected data 214 connections reset due to early user close 352 connections aborted due to timeout TCPDSACKIgnoredNoUndo: 1571 TCPSpuriousRTOs: 7 TCPSackShifted: 94 TCPSackMerged: 131 TCPSackShiftFallback: 21183 TCPTimeWaitOverflow: 1876775 TCPRcvCoalesce: 15711184 TCPOFOQueue: 3194 TCPChallengeACK: 2337394 TCPSYNChallenge: 13608 TCPSpuriousRtxHostQueues: 1982796 IpExt: InBcastPkts: 46443933 InOctets: 44312451521655 OutOctets: 1915626725817 InBcastOctets: 6827280595 喂，要是转载文章。麻烦贴一下出处 ykyi.net 采集爬虫把链接也抓走 ...