netstat-打印网络连接,路由表,接口统计信息的工具,在平常工作也会经常遇到;
常用选项: -i:查看网卡数据包收发情况(常用于查看是否有丢包、错误) -s:对各种协议的统计信息 -r:查看路由表信息(也常用route -n)查看
用法示例一:查看网络包收发情况,以确定是否存在丢包的情况(当网络存在延迟的时候用)
[[email protected] ~]# netstat -i Kernel Interface table Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg ens33 1500 115820 0 0 0 25312 0 0 0 BMRU lo 65536 104 0 0 0 104 0 0 0 LRU
RX-OK:接收的总包数 RX-ERR:总错误数 RX-DRP:进入 Ring Buffer 后因其他原因(如内存不足)导致的丢包数 RX-OVR:Ring Buffer 溢出导致的丢包数 TX-OK等也是类似的
用法示例二:对各种协议的统计信息(常用于确认传输层和网络层是否出现问题)
会对ip、icmp、tcp、udp协议的网络包数据进行统计
[[email protected] ~]# netstat -s Ip: 24060 total packets received 0 forwarded 0 incoming packets discarded 24060 incoming packets delivered 23707 requests sent out 16 outgoing packets dropped Icmp: 83 ICMP messages received 2 input ICMP message failed. ICMP input histogram: destination unreachable: 81 echo replies: 2 151 ICMP messages sent 0 ICMP messages failed ICMP output histogram: destination unreachable: 146 echo request: 5 IcmpMsg: InType0: 2 InType3: 81 OutType3: 146 OutType8: 5 Tcp: 83 active connections openings 2 passive connection openings 0 failed connection attempts 1 connection resets received 2 connections established 26009 segments received 24723 segments send out 22 segments retransmited 0 bad segments received. 14 resets sent Udp: 157 packets received 149 packets to unknown port received. 0 packet receive errors 337 packets sent 0 receive buffer errors 0 send buffer errors UdpLite: TcpExt: 1 invalid SYN cookies received 64 TCP sockets finished time wait in fast timer 10 delayed acks sent Quick ack mode was activated 63 times 9978 packet headers predicted 1349 acknowledgments not containing data payload received 71 predicted acknowledgments 6 congestion windows recovered without slow start after partial ack 8 other TCP timeouts TCPLossProbes: 7 TCPLossProbeRecovery: 2 65 DSACKs sent for old packets 4 DSACKs sent for out of order packets 5 DSACKs received 6 connections reset due to unexpected data 1 connections aborted due to timeout TCPRcvCoalesce: 13797 TCPOFOQueue: 12267 TCPOFOMerge: 4 TCPSynRetrans: 7 TCPOrigDataSent: 2676 IpExt: InMcastPkts: 69 InBcastPkts: 84 InOctets: 144180091 OutOctets: 2230841 InMcastOctets: 1932 InBcastOctets: 9481 InNoECTPkts: 104145 [[email protected] ~]#
TCPSynRetrans: 7 #7次 SYN 重传
原文地址:https://www.cnblogs.com/liujunjun/p/12247935.html
时间: 2024-10-18 05:25:31