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[转载]Linux性能测试 netstat命令

功能说明：Netstat用于显示与IP、TCP、UDP和ICMP协议相关的统计数据，一般用于检验本机各端口的网络连接情况。
语法：netstat [-acCeFghilMnNoprstuvVwx][-A<网络类型>][--ip]
补充说明：利用netstat指令可让你得知整个Linux系统的网络情况。
参数：
-a或–all 显示所有连线中的Socket。
-A<网络类型>或–<网络类型> 列出该网络类型连线中的相关地址。
-c或–continuous 持续列出网络状态。
-C或–cache 显示路由器配置的快取信息。
-e或–extend 显示网络其他相关信息。
-F或–fib 显示FIB。
-g或–groups 显示多重广播功能群组组员名单。
-h或–help 在线帮助。
-i或–interfaces 显示网络界面信息表单。
-l或–listening 显示监控中的服务器的Socket。
-M或–masquerade 显示伪装的网络连线。
-n或–numeric 直接使用IP地址，而不通过域名服务器。
-N或–netlink或–symbolic 显示网络硬件外围设备的符号连接名称。
-o或–timers 显示计时器。
-p或–programs 显示正在使用Socket的程序识别码和程序名称。
-r或–route 显示Routing Table。
-s或–statistice 显示网络工作信息统计表。
-t或–tcp 显示TCP传输协议的连线状况。
-u或–udp 显示UDP传输协议的连线状况。
-v或–verbose 显示指令执行过程。
-V或–version 显示版本信息。
-w或–raw 显示RAW传输协议的连线状况。
-x或–unix 此参数的效果和指定”-A unix”参数相同。
–ip或–inet 此参数的效果和指定”-A inet”参数相同

netstat 的一些常用选项
netstat -s
本选项能够按照各个协议分别显示其统计数据。如果我们的应用程序（如Web浏览器）运行速度比较慢，或者不能显示Web页之类的数据，那么我们就可以用本选项来查看一下所显示的信息。我们需要仔细查看统计数据的各行，找到出错的关键字，进而确定问题所在。

   1: [root@SM155 proc]# netstat -s

   2: Ip:

   3:     8530928 total packets received

   4:     0 forwarded

   5:     0 incoming packets discarded

   6:     6972819 incoming packets delivered

   7:     8521573 requests sent out

   8:     1 fragments dropped after timeout

   9:     39629 reassemblies required

  10:     19667 packets reassembled ok

  11:     1 packet reassembles failed

  12: Icmp:

  13:     16023 ICMP messages received

  14:     175 input ICMP message failed.

  15:     ICMP input histogram:

  16:         destination unreachable: 4362

  17:         echo requests: 11661

  18:     19476 ICMP messages sent

  19:     0 ICMP messages failed

  20:     ICMP output histogram:

  21:         destination unreachable: 7815

  22:         echo replies: 11661

  23: Tcp:

  24:     1651264 active connections openings

  25:     159526 passive connection openings

  26:     197 failed connection attempts

  27:     150104 connection resets received

  28:     31 connections established

  29:     6439010 segments received

  30:     6739834 segments send out

  31:     423 segments retransmited

  32:     0 bad segments received.

  33:     1649444 resets sent

  34: Udp:

  35:     135397 packets received

  36:     7341 packets to unknown port received.

  37:     0 packet receive errors

  38:     1762263 packets sent

  39: TcpExt:

  40:     ArpFilter: 0

  41:     800 TCP sockets finished time wait in fast timer

  42:     300 time wait sockets recycled by time stamp

  43:     8850 delayed acks sent

  44:     1 delayed acks further delayed because of locked socket

  45:     Quick ack mode was activated 12 times

  46:     552580 packets directly queued to recvmsg prequeue.

  47:     296789 packets directly received from prequeue

  48:     724223 packets header predicted

  49:     11117 packets header predicted and directly queued to user

  50:     TCPPureAcks: 249691

  51:     TCPHPAcks: 1235152

  52:     TCPRenoRecovery: 0

  53:     TCPSackRecovery: 1

  54:     TCPSACKReneging: 0

  55:     TCPFACKReorder: 0

  56:     TCPSACKReorder: 0

netstat -e
本选项用于显示关于以太网的统计数据。它列出的项目包括传送的数据报的总字节数、错误数、删除数、数据报的数量和广播的数量。这些统计数据既有发送的数据报数量，也有接收的数据报数量。这个选项可以用来统计一些基本的网络流量）。

   1: [root@SM155 proc]# netstat -e

   2: Active Internet connections (w/o servers)

   3: Proto Recv-Q Send-Q Local Address               Foreign Address             State       User       Inode

   4: tcp        0      0 10.90.243.155:49182         10.90.243.27:32931          ESTABLISHED root       382858

   5: tcp        0      0 localhost.localdomain:49176 localhost.localdomain:39918 ESTABLISHED root       24542

   6: tcp        1      0 10.90.243.155:64766         10.90.243.27:951            CLOSE_WAIT  root       3239351

   7: tcp        0      0 localhost.localdomain:39015 localhost.localdomain:49178 ESTABLISHED root       24546

   8: tcp        0      0 localhost.localdomain:39016 localhost.localdomain:49179 ESTABLISHED root       24548

   9: tcp        0      0 10.90.243.155:ssh           10.88.22.243:3672           ESTABLISHED root       6062002

netstat -r

本选项可以显示关于路由表的信息，类似于后面所讲使用route print命令时看到的信息。除了显示有效路由外，还显示当前有效的连接。

   1: [root@SM155 proc]# netstat -r

   2: Kernel IP routing table

   3: Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface

   4: 10.90.243.0     *               255.255.255.0   U         0 0          0 eth0

   5: 10.10.10.0      *               255.255.255.0   U         0 0          0 eth1

   6: 169.254.0.0     *               255.255.0.0     U         0 0          0 eth1

   7: default         10.90.243.1     0.0.0.0         UG        0 0          0 eth0

   8: [root@SM155 proc]#

netstat -a

本选项显示一个所有的有效连接信息列表，包括已建立的连接（ESTABLISHED），也包括监听连接请（LISTENING）的那些连接。

   1: [root@SM155 proc]# netstat -a

   2: Active Internet connections (servers and established)

   3: Proto Recv-Q Send-Q Local Address               Foreign Address             State

   4: tcp        0      0 10.90.243.155:39010         *:*                         LISTEN

   5: tcp        0      0 *:shell                     *:*                         LISTEN

   6: tcp        0      0 10.90.243.155:39011         *:*                         LISTEN

   7: tcp        0      0 *:39012                     *:*                         LISTEN

   8: tcp        0      0 *:39015                     *:*                         LISTEN

   9: tcp        0      0 *:49159                     *:*                         LISTEN

  10: tcp        0      0 localhost.localdomain:39016 *:*                         LISTEN

  11: tcp        0      0 *:49166                     *:*                         LISTEN

  12: tcp        0      0 *:39918                     *:*                         LISTEN

  13: tcp        0      0 *:sunrpc                    *:*                         LISTEN

  14: tcp        0      0 *:49173                     *:*                         LISTEN

  15: tcp        0      0 *:ftp                       *:*                         LISTEN

  16: tcp        0      0 *:ssh                       *:*                         LISTEN

  17: tcp        0      0 *:13819                     *:*                         LISTEN

  18: tcp        0      0 *:2812                      *:*                         LISTEN

  19: tcp        0      0 10.90.243.155:49182         *:*                         LISTEN

  20: tcp        0      0 10.90.243.155:49182         10.90.243.27:32931          ESTABLISHED

  21: tcp        0      0 localhost.localdomain:49176 localhost.localdomain:39918 ESTABLISHED

  22: tcp        1      0 10.90.243.155:64766         10.90.243.27:951            CLOSE_WAIT

  23: tcp        0      0 localhost.localdomain:39015 localhost.localdomain:49178 ESTABLISHED

  24: tcp        0      0 localhost.localdomain:39016 localhost.localdomain:49179 ESTABLISHED

netstat -n
显示所有已建立的有效连接。

   1: [root@SM155 proc]# netstat -n

   2: Active Internet connections (w/o servers)

   3: Proto Recv-Q Send-Q Local Address               Foreign Address             State

   4: tcp        0      0 10.90.243.155:49182         10.90.243.27:32931          ESTABLISHED

   5: tcp        0      0 127.0.0.1:49176             127.0.0.1:39918             ESTABLISHED

   6: tcp        1      0 10.90.243.155:64766         10.90.243.27:951            CLOSE_WAIT

   7: tcp        0      0 127.0.0.1:39015             127.0.0.1:49178             ESTABLISHED

   8: tcp        0      0 127.0.0.1:39016             127.0.0.1:49179             ESTABLISHED

   9: tcp        0      0 127.0.0.1:39918             127.0.0.1:49176             ESTABLISHED

  10: tcp        0      0 10.90.243.155:58692         10.90.243.155:39010         ESTABLISHED

  11: tcp        0      0 10.90.243.155:39012         10.90.243.155:49168         ESTABLISHED

  12: tcp        0      0 127.0.0.1:39012             127.0.0.1:49174             ESTABLISHED

  13: tcp        0      0 10.90.243.155:39012         10.90.243.155:49175         ESTABLISHED

  14: tcp        0      0 127.0.0.1:39012             127.0.0.1:49160             ESTABLISHED

  15: tcp        0      0 10.90.243.155:39012         10.90.243.155:49161         ESTABLISHED

  16: tcp        0      0 127.0.0.1:39012             127.0.0.1:49167             ESTABLISHED

  17: tcp        0      0 10.90.243.155:49185         10.90.243.155:39011         ESTABLISHED

  18: tcp        0      0 127.0.0.1:49174             127.0.0.1:39012             ESTABLISHED

  19: tcp        0      0 10.90.243.155:49175         10.90.243.155:39012         ESTABLISHED

  20: tcp        0      0 10.90.243.155:49168         10.90.243.155:39012         ESTABLISHED

  21: tcp        0      0 127.0.0.1:49167             127.0.0.1:39012             ESTABLISHED

  22: tcp        0      0 127.0.0.1:49160             127.0.0.1:39012             ESTABLISHED

  23: tcp        0      0 10.90.243.155:49161         10.90.243.155:39012         ESTABLISHED

  24: tcp        0      0 10.90.243.155:49159         10.90.243.155:58726         ESTABLISHED

  25: tcp        0      0 127.0.0.1:49178             127.0.0.1:39015             ESTABLISHED

■ 原文网址：http://txw1958.cnblogs.com/

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原文地址：https://www.cnblogs.com/lovemdx/p/2874193.html