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        學習啦 > 學習電腦 > 操作系統 > Linux教程 > linux中的netstat命令

        linux中的netstat命令

        時間: 佳洲1085 分享

        linux中的netstat命令

          Linux系統中的netstat命令一般用于檢驗本機各端口的網絡連接情況。下面由學習啦小編為大家整理了linux中的netstat命令的相關知識,希望對大家有幫助!

          linux中的netstat命令詳解

          1.命令格式:

          netstat [-acCeFghilMnNoprstuvVwx][-A<網絡類型>][--ip]

          2.命令功能:

          netstat用于顯示與IP、TCP、UDP和ICMP協議相關的統計數據,一般用于檢驗本機各端口的網絡連接情況。

          3.命令參數:

          -a或–all 顯示所有連線中的Socket。

          -A<網絡類型>或–<網絡類型> 列出該網絡類型連線中的相關地址。

          -c或–continuous 持續列出網絡狀態。

          -C或–cache 顯示路由器配置的快取信息。

          -e或–extend 顯示網絡其他相關信息。

          -F或–fib 顯示FIB。

          -g或–groups 顯示多重廣播功能群組組員名單。

          -h或–help 在線幫助。

          -i或–interfaces 顯示網絡界面信息表單。

          -l或–listening 顯示監控中的服務器的Socket。

          -M或–masquerade 顯示偽裝的網絡連線。

          -n或–numeric 直接使用IP地址,而不通過域名服務器。

          -N或–netlink或–symbolic 顯示網絡硬件外圍設備的符號連接名稱。

          -o或–timers 顯示計時器。

          -p或–programs 顯示正在使用Socket的程序識別碼和程序名稱。

          -r或–route 顯示Routing Table。

          -s或–statistice 顯示網絡工作信息統計表。

          -t或–tcp 顯示TCP傳輸協議的連線狀況。

          -u或–udp 顯示UDP傳輸協議的連線狀況。

          -v或–verbose 顯示指令執行過程。

          -V或–version 顯示版本信息。

          -w或–raw 顯示RAW傳輸協議的連線狀況。

          -x或–unix 此參數的效果和指定”-A unix”參數相同。

          –ip或–inet 此參數的效果和指定”-A inet”參數相同。

          linux中的netstat命令實例

          實例1:無參數使用

          命令:

          netstat

          輸出:

          [root@localhost ~]# netstat

          Active Internet connections (w/o servers)

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

          tcp 0 268 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED

          udp 0 0 192.168.120.204:4371 10.58.119.119:domain ESTABLISHED

          Active UNIX domain sockets (w/o servers)

          Proto RefCnt Flags Type State I-Node Path

          unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

          unix 4 [ ] DGRAM 7337 /dev/log

          unix 2 [ ] DGRAM 708823

          unix 2 [ ] DGRAM 7539

          unix 3 [ ] STREAM CONNECTED 7287

          unix 3 [ ] STREAM CONNECTED 7286

          [root@localhost ~]#

          說明:

          從整體上看,netstat的輸出結果可以分為兩個部分:

          一個是Active Internet connections,稱為有源TCP連接,其中"Recv-Q"和"Send-Q"指的是接收隊列和發送隊列。這些數字一般都應該是0。如果不是則表示軟件包正在隊列中堆積。這種情況只能在非常少的情況見到。

          另一個是Active UNIX domain sockets,稱為有源Unix域套接口(和網絡套接字一樣,但是只能用于本機通信,性能可以提高一倍)。

          Proto顯示連接使用的協議,RefCnt表示連接到本套接口上的進程號,Types顯示套接口的類型,State顯示套接口當前的狀態,Path表示連接到套接口的其它進程使用的路徑名。

          套接口類型:

          -t :TCP

          -u :UDP

          -raw :RAW類型

          --unix :UNIX域類型

          --ax25 :AX25類型

          --ipx :ipx類型

          --netrom :netrom類型

          狀態說明:

          LISTEN:偵聽來自遠方的TCP端口的連接請求

          SYN-SENT:再發送連接請求后等待匹配的連接請求(如果有大量這樣的狀態包,檢查是否中招了)

          SYN-RECEIVED:再收到和發送一個連接請求后等待對方對連接請求的確認(如有大量此狀態,估計被flood攻擊了)

          ESTABLISHED:代表一個打開的連接

          FIN-WAIT-1:等待遠程TCP連接中斷請求,或先前的連接中斷請求的確認

          FIN-WAIT-2:從遠程TCP等待連接中斷請求

          CLOSE-WAIT:等待從本地用戶發來的連接中斷請求

          CLOSING:等待遠程TCP對連接中斷的確認

          LAST-ACK:等待原來的發向遠程TCP的連接中斷請求的確認(不是什么好東西,此項出現,檢查是否被攻擊)

          TIME-WAIT:等待足夠的時間以確保遠程TCP接收到連接中斷請求的確認

          CLOSED:沒有任何連接狀態

          實例2:列出所有端口

          命令:

          netstat -a

          輸出:

          [root@localhost ~]# netstat -a

          Active Internet connections (servers and established)

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

          tcp 0 0 localhost:smux *:* LISTEN

          tcp 0 0 *:svn *:* LISTEN

          tcp 0 0 *:ssh *:* LISTEN

          tcp 0 284 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED

          udp 0 0 localhost:syslog *:*

          udp 0 0 *:snmp *:*

          Active UNIX domain sockets (servers and established)

          Proto RefCnt Flags Type State I-Node Path

          unix 2 [ ACC ] STREAM LISTENING 708833 /tmp/ssh-yKnDB15725/agent.15725

          unix 2 [ ACC ] STREAM LISTENING 7296 /var/run/audispd_events

          unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

          unix 4 [ ] DGRAM 7337 /dev/log

          unix 2 [ ] DGRAM 708823

          unix 2 [ ] DGRAM 7539

          unix 3 [ ] STREAM CONNECTED 7287

          unix 3 [ ] STREAM CONNECTED 7286

          [root@localhost ~]#

          說明:

          顯示一個所有的有效連接信息列表,包括已建立的連接(ESTABLISHED),也包括監聽連接請(LISTENING)的那些連接。

          實例3:顯示當前UDP連接狀況

          命令:

          netstat -nu

          輸出:

          [root@andy ~]# netstat -nu

          Active Internet connections (w/o servers)

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

          udp 0 0 ::ffff:192.168.12:53392 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:56723 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:56480 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:58154 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:44227 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:36954 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:53984 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:57703 ::ffff:192.168.9.120:10000 ESTABLISHED

          udp 0 0 ::ffff:192.168.12:53613 ::ffff:192.168.9.120:10000 ESTABLISHED

          [root@andy ~]#

          說明:

          實例4:顯示UDP端口號的使用情況

          命令:

          netstat -apu

          輸出:

          [root@andy ~]# netstat -apu

          Active Internet connections (servers and established)

          Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

          udp 0 0 *:57604 *:* 28094/java

          udp 0 0 *:40583 *:* 21220/java

          udp 0 0 *:45451 *:* 14583/java

          udp 0 0 ::ffff:192.168.12:53392 ::ffff:192.168.9.120:ndmp ESTABLISHED 19327/java

          udp 0 0 *:52370 *:* 15841/java

          udp 0 0 ::ffff:192.168.12:56723 ::ffff:192.168.9.120:ndmp ESTABLISHED 15841/java

          udp 0 0 *:44182 *:* 31757/java

          udp 0 0 *:48155 *:* 5476/java

          udp 0 0 *:59808 *:* 17333/java

          udp 0 0 ::ffff:192.168.12:56480 ::ffff:192.168.9.120:ndmp ESTABLISHED 28094/java

          udp 0 0 ::ffff:192.168.12:58154 ::ffff:192.168.9.120:ndmp ESTABLISHED 15429/java

          udp 0 0 *:36780 *:* 10091/java

          udp 0 0 *:36795 *:* 24594/java

          udp 0 0 *:41922 *:* 20506/java

          udp 0 0 ::ffff:192.168.12:44227 ::ffff:192.168.9.120:ndmp ESTABLISHED 17333/java

          udp 0 0 *:34258 *:* 8866/java

          udp 0 0 *:55508 *:* 11667/java

          udp 0 0 *:36055 *:* 12425/java

          udp 0 0 ::ffff:192.168.12:36954 ::ffff:192.168.9.120:ndmp ESTABLISHED 16532/java

          udp 0 0 ::ffff:192.168.12:53984 ::ffff:192.168.9.120:ndmp ESTABLISHED 20506/java

          udp 0 0 ::ffff:192.168.12:57703 ::ffff:192.168.9.120:ndmp ESTABLISHED 31757/java

          udp 0 0 ::ffff:192.168.12:53613 ::ffff:192.168.9.120:ndmp ESTABLISHED 3199/java

          udp 0 0 *:56309 *:* 15429/java

          udp 0 0 *:54007 *:* 16532/java

          udp 0 0 *:39544 *:* 3199/java

          udp 0 0 *:43900 *:* 19327/java

          [root@andy ~]#

          說明:

          實例5:顯示網卡列表

          命令:

          netstat -i

          輸出:

          [root@andy ~]# netstat -i

          Kernel Interface table

          Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg

          eth0 1500 0 151818887 0 0 0 198928403 0 0 0 BMRU

          lo 16436 0 107235 0 0 0 107235 0 0 0 LRU

          [root@andy ~]#

          說明:

          實例6:顯示組播組的關系

          命令:

          netstat -g

          輸出:

          [root@andy ~]# netstat -g

          IPv6/IPv4 Group Memberships

          Interface RefCnt Group

          --------------- ------ ---------------------

          lo 1 all-systems.mcast.net

          eth0 1 all-systems.mcast.net

          lo 1 ff02::1

          eth0 1 ff02::1:ffff:9b0c

          eth0 1 ff02::1

          [root@andy ~]#

          說明:

          實例7:顯示網絡統計信息

          命令:

          netstat -s

          輸出:

          [root@localhost ~]# netstat -s

          Ip:

          530999 total packets received

          0 forwarded

          0 incoming packets discarded

          530999 incoming packets delivered

          8258 requests sent out

          1 dropped because of missing route

          Icmp:

          90 ICMP messages received

          0 input ICMP message failed.

          ICMP input histogram:

          destination unreachable: 17

          echo requests: 1

          echo replies: 72

          106 ICMP messages sent

          0 ICMP messages failed

          ICMP output histogram:

          destination unreachable: 8

          echo request: 97

          echo replies: 1

          IcmpMsg:

          InType0: 72

          InType3: 17

          InType8: 1

          OutType0: 1

          OutType3: 8

          OutType8: 97

          Tcp:

          8 active connections openings

          15 passive connection openings

          8 failed connection attempts

          3 connection resets received

          1 connections established

          3132 segments received

          2617 segments send out

          53 segments retransmited

          0 bad segments received.

          252 resets sent

          Udp:

          0 packets received

          0 packets to unknown port received.

          0 packet receive errors

          5482 packets sent

          TcpExt:

          1 invalid SYN cookies received

          1 TCP sockets finished time wait in fast timer

          57 delayed acks sent

          Quick ack mode was activated 50 times

          60 packets directly queued to recvmsg prequeue.

          68 packets directly received from backlog

          4399 packets directly received from prequeue

          520 packets header predicted

          51 packets header predicted and directly queued to user

          1194 acknowledgments not containing data received

          21 predicted acknowledgments

          0 TCP data loss events

          1 timeouts after reno fast retransmit

          9 retransmits in slow start

          42 other TCP timeouts

          3 connections aborted due to timeout

          IpExt:

          InBcastPkts: 527777

          說明:

          按照各個協議分別顯示其統計數據。如果我們的應用程序(如Web瀏覽器)運行速度比較慢,或者不能顯示Web頁之類的數據,那么我們就可以用本選項來查看一下所顯示的信息。我們需要仔細查看統計數據的各行,找到出錯的關鍵字,進而確定問題所在。

          實例8:顯示監聽的套接口

          命令:

          netstat -l

          輸出:

          [root@localhost ~]# netstat -l

          Active Internet connections (only servers)

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

          tcp 0 0 localhost:smux *:* LISTEN

          tcp 0 0 *:svn *:* LISTEN

          tcp 0 0 *:ssh *:* LISTEN

          udp 0 0 localhost:syslog *:*

          udp 0 0 *:snmp *:*

          Active UNIX domain sockets (only servers)

          Proto RefCnt Flags Type State I-Node Path

          unix 2 [ ACC ] STREAM LISTENING 708833 /tmp/ssh-yKnDB15725/agent.15725

          unix 2 [ ACC ] STREAM LISTENING 7296 /var/run/audispd_events

          [root@localhost ~]#

          說明:

          實例9:顯示所有已建立的有效連接

          命令:

          netstat -n

          輸出:

          [root@localhost ~]# netstat -n

          Active Internet connections (w/o servers)

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

          tcp 0 268 192.168.120.204:22 10.2.0.68:62420 ESTABLISHED

          Active UNIX domain sockets (w/o servers)

          Proto RefCnt Flags Type State I-Node Path

          unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

          unix 4 [ ] DGRAM 7337 /dev/log

          unix 2 [ ] DGRAM 708823

          unix 2 [ ] DGRAM 7539

          unix 3 [ ] STREAM CONNECTED 7287

          unix 3 [ ] STREAM CONNECTED 7286

          [root@localhost ~]#

          說明:

          實例10:顯示關于以太網的統計數據

          命令:

          netstat -e

          輸出:

          [root@localhost ~]# netstat -e

          Active Internet connections (w/o servers)

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

          tcp 0 248 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED root 708795

          Active UNIX domain sockets (w/o servers)

          Proto RefCnt Flags Type State I-Node Path

          unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

          unix 4 [ ] DGRAM 7337 /dev/log

          unix 2 [ ] DGRAM 708823

          unix 2 [ ] DGRAM 7539

          unix 3 [ ] STREAM CONNECTED 7287

          unix 3 [ ] STREAM CONNECTED 7286

          [root@localhost ~]#

          說明:

          用于顯示關于以太網的統計數據。它列出的項目包括傳送的數據報的總字節數、錯誤數、刪除數、數據報的數量和廣播的數量。這些統計數據既有發送的數據報數量,也有接收的數據報數量。這個選項可以用來統計一些基本的網絡流量)

          實例11:顯示關于路由表的信息

          命令:

          netstat -r

          輸出:

          [root@localhost ~]# netstat -r

          Kernel IP routing table

          Destination Gateway Genmask Flags MSS Window irtt Iface

          192.168.120.0 * 255.255.255.0 U 0 0 0 eth0

          192.168.0.0 192.168.120.1 255.255.0.0 UG 0 0 0 eth0

          10.0.0.0 192.168.120.1 255.0.0.0 UG 0 0 0 eth0

          default 192.168.120.240 0.0.0.0 UG 0 0 0 eth0

          [root@localhost ~]#

          說明:

          實例12:列出所有 tcp 端口

          命令:

          netstat -at

          輸出:

          [root@localhost ~]# netstat -at

          Active Internet connections (servers and established)

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

          tcp 0 0 localhost:smux *:* LISTEN

          tcp 0 0 *:svn *:* LISTEN

          tcp 0 0 *:ssh *:* LISTEN

          tcp 0 284 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED

          [root@localhost ~]#

          說明:

          實例13:統計機器中網絡連接各個狀態個數

          命令:

          netstat -a | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

          輸出:

          [root@localhost ~]# netstat -a | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

          ESTABLISHED 1

          LISTEN 3

          [root@localhost ~]#

          說明:

          實例14:把狀態全都取出來后使用uniq -c統計后再進行排序

          命令:

          netstat -nat |awk '{print }'|sort|uniq -c

          輸出:

          [root@andy ~]# netstat -nat |awk '{print }'|sort|uniq -c

          14 CLOSE_WAIT

          1 established)

          578 ESTABLISHED

          1 Foreign

          43 LISTEN

          5 TIME_WAIT

          [root@andy ~]# netstat -nat |awk '{print }'|sort|uniq -c|sort -rn

          576 ESTABLISHED

          43 LISTEN

          14 CLOSE_WAIT

          5 TIME_WAIT

          1 Foreign

          1 established)

          [root@andy ~]#

          說明:

          實例15:查看連接某服務端口最多的的IP地址

          命令:

          netstat -nat | grep "192.168.120.20:16067" |awk '{print }'|awk -F: '{print }'|sort|uniq -c|sort -nr|head -20

          輸出:

          [root@andy ~]# netstat -nat | grep "192.168.120.20:16067" |awk '{print }'|awk -F: '{print }'|sort|uniq -c|sort -nr|head -20

          8 10.2.1.68

          7 192.168.119.13

          6 192.168.119.201

          6 192.168.119.20

          6 192.168.119.10

          4 10.2.1.199

          3 10.2.1.207

          2 192.168.120.20

          2 192.168.120.15

          2 192.168.119.197

          2 192.168.119.11

          2 10.2.1.206

          2 10.2.1.203

          2 10.2.1.189

          2 10.2.1.173

          1 192.168.120.18

          1 192.168.119.19

          1 10.2.2.227

          1 10.2.2.138

          1 10.2.1.208

          [root@andy ~]#

          說明:

          實例16:找出程序運行的端口

          命令:

          netstat -ap | grep ssh

          輸出:

          [root@andy ~]# netstat -ap | grep ssh

          tcp 0 0 *:ssh *:* LISTEN 2570/sshd

          tcp 0 0 ::ffff:192.168.120.206:ssh ::ffff:10.2.1.205:54508 ESTABLISHED 13883/14

          tcp 0 0 ::ffff:192.168.120.206:ssh ::ffff:10.2.0.68:62886 ESTABLISHED 20900/6

          tcp 0 0 ::ffff:192.168.120.206:ssh ::ffff:10.2.2.131:52730 ESTABLISHED 20285/sshd: root@no

          unix 2 [ ACC ] STREAM LISTENING 194494461 20900/6 /tmp/ssh-cXIJj20900/agent.20900

          unix 3 [ ] STREAM CONNECTED 194307443 20285/sshd: root@no

          unix 3 [ ] STREAM CONNECTED 194307441 20285/sshd: root@no

          [root@andy ~]#

          說明:

          實例17:在 netstat 輸出中顯示 PID 和進程名稱

          命令:

          netstat -pt

          輸出:

          [root@localhost ~]# netstat -pt

          Active Internet connections (w/o servers)

          Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

          tcp 0 248 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED 15725/0

          [root@localhost ~]#

          說明:

          netstat -p 可以與其它開關一起使用,就可以添加 “PID/進程名稱” 到 netstat 輸出中,這樣 debugging 的時候可以很方便的發現特定端口運行的程序。

          實例18:找出運行在指定端口的進程

          命令:

          netstat -anpt | grep ':16064'

          輸出:

          [root@andy ~]# netstat -anpt | grep ':16064'

          tcp 0 0 :::16064 :::* LISTEN 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.201:6462 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.20:26341 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.20:32208 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.20:32207 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:51303 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:51302 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50020 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50019 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:56155 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50681 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50680 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:52136 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:56989 ESTABLISHED 24594/java

          tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:56988 ESTABLISHED 24594/java

          [root@andy ~]#

          說明:

          運行在端口16064的進程id為24596,再通過ps命令就可以找到具體的應用程序了。

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