Linux的netstat命令
1、TCP连接状态详解
- LISTEN: 侦听来自远方的TCP端口的连接请求
- SYN-SENT: 再发送连接请求后等待匹配的连接请求
- SYN-RECEIVED:再收到和发送一个连接请求后等待对方对连接请求的确认
- ESTABLISHED: 代表一个打开的连接
- FIN-WAIT-1: 等待远程TCP连接中断请求,或先前的连接中断请求的确认
- FIN-WAIT-2: 从远程TCP等待连接中断请求
- CLOSE-WAIT: 等待从本地用户发来的连接中断请求
- CLOSING: 等待远程TCP对连接中断的确认
- LAST-ACK: 等待原来的发向远程TCP的连接中断请求的确认
- TIME-WAIT: 等待足够的时间以确保远程TCP接收到连接中断请求的确认
- CLOSED: 没有任何连接状态
2、命令格式
netstat(选项)
3、命令选项
- -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。
4、列出所有端口(包含TCP和UDP)
> netstat -a
4、列出所有TCP端口
> netstat -at
5、列出所有UDP端口
> netstat -au
6、列出所有处于监听状态的 Sockets
> netstat -l
7、只列出所有监听tcp端口
> netstat -lt
8、只列出所有监听udp端口
> netstat -lu
9、只列出所有监听UNIX端口
> netstat -lx
10显示所有端口的统计信息
> netstat -s Ip: 1007495197 total packets received 0 forwarded 582 with unknown protocol 0 incoming packets discarded 1007422115 incoming packets delivered Icmp: 66583265 ICMP messages received 63899 input ICMP message failed. InCsumErrors: 384 ICMP input histogram: destination unreachable: 115410 timeout in transit: 12840 source quenches: 11 redirects: 563 echo requests: 66453453 echo replies: 152 timestamp request: 438 address mask request: 4 66987000 ICMP messages sent 0 ICMP messages failed ICMP output histogram: destination unreachable: 533106 echo request: 4 echo replies: 66453453 timestamp replies: 437 IcmpMsg: InType0: 152 InType3: 115410 InType4: 11 InType5: 563 IpExt: InNoRoutes: 15 InMcastPkts: 1291307 InOctets: 211446050816 OutOctets: 481070069194
11、显示TCP端口的统计信息
> netstat -st IcmpMsg: InType0: 152 InType3: 115410 InType4: 11 InType5: 563 InType8: 66453492 Tcp: 55437641 active connections openings 35899081 passive connection openings 552243 failed connection attempts 753118 connection resets received 7 connections established UdpLite: TcpExt: 162052 SYN cookies sent 621 SYN cookies received 4998179 invalid SYN cookies received 551915 resets received for embryonic SYN_RECV sockets IpExt: InNoRoutes: 15 InMcastPkts: 1291308 InOctets: 211446303015 OutOctets: 481070459735 InMcastOctets: 46487088
12、显示UDP端口的统计信息
> netstat -su IcmpMsg: InType0: 152 InType3: 115410 InType4: 11 InType5: 563 InType8: 66453594 InType11: 12840 InType13: 438 InType17: 4 InType37: 3 InType165: 7 OutType0: 66453594 OutType3: 533106 OutType8: 4 OutType14: 437 Udp: 17941589 packets received 637146 packets to unknown port received. 1649 packet receive errors 17977050 packets sent 0 receive buffer errors 0 send buffer errors InCsumErrors: 1640 UdpLite: IpExt: InNoRoutes: 15 InMcastPkts: 1291310 InOctets: 211446802283 OutOctets: 481071405083 InMcastOctets: 46487160 InNoECTPkts: 1009629627 InECT1Pkts: 9955 InECT0Pkts: 1987096 InCEPkts: 94039
13、在netstat输出中显示 PID 和进程名称
> netstat -pt
14、在netstat输出中不显示主机,端口和用户名(host, port or user)
> netstat -an
15、持续输出netstat信息
每隔一秒输出网络信息
> netstat -c
16、显示核心路由信息
> netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default gateway 0.0.0.0 UG 0 0 0 eth0 link-local 0.0.0.0 255.255.0.0 U 0 0 0 eth0 172.16.0.0 0.0.0.0 255.255.240.0 U 0 0 0 eth0
17、使用netstat -rn显示数字格式,不查询主机名称。
> netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 172.16.0.1 0.0.0.0 UG 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 172.16.0.0 0.0.0.0 255.255.240.0 U 0 0 0 eth0
18、找出程序运行的端口
> netstat -tunlp | grep ssh tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 4400/sshd
19、找出运行在指定端口的进程
> netstat -an | grep ":80" tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN tcp 0 0 172.16.0.9:80 185.191.171.12:9380 TIME_WAIT tcp 0 0 172.16.0.9:80 185.191.171.26:52418 TIME_WAIT tcp 0 3450 172.16.0.9:80 185.191.171.37:25108 FIN_WAIT1 tcp 0 0 172.16.0.9:80 185.191.171.37:55096 TIME_WAIT tcp 0 0 172.16.0.9:80 144.76.176.171:27832 TIME_WAIT tcp 0 0 172.16.0.9:80 118.126.124.7:11127 TIME_WAIT tcp 0 0 172.16.0.9:46628 169.254.0.55:8080 TIME_WAIT tcp 0 0 172.16.0.9:80 144.76.176.171:23812 ESTABLISHED
20、通过端口找进程ID
> netstat -tunlp | grep 80 | awk '{print $7}' | cut -d/ -f1 21323
21、显示网络接口列表
> netstat -i Kernel Interface table Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg docker0 1500 0 0 0 0 0 0 0 0 BMU eth0 1450 462305568 0 0 0 276046945 0 0 0 BMRU lo 65536 7204971 0 0 0 7204971 0 0 0 LRU _abi 1500 229612389 0 1023383 0 146640133 0 956 0 BMRU
22、统计TCP各种状态列表
> netstat -n | awk '/^tcp/{++S[$NF]}END{for(i in S) print i,S[i]}' ESTABLISHED 7 FIN_WAIT2 13 TIME_WAIT 18
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