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鍍金池/ 教程/ Linux/ netstat命令
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netstat命令

netstat命令用于顯示與IP、TCP、UDP和ICMP協(xié)議相關(guān)的統(tǒng)計(jì)數(shù)據(jù)，一般用于檢驗(yàn)本機(jī)各端口的網(wǎng)絡(luò)連接情況。netstat是在內(nèi)核中訪問網(wǎng)絡(luò)及相關(guān)信息的程序，它能提供TCP連接，TCP和UDP監(jiān)聽，進(jìn)程內(nèi)存管理的相關(guān)報(bào)告。

如果計(jì)算機(jī)有時(shí)候接收到的數(shù)據(jù)報(bào)導(dǎo)致出錯(cuò)數(shù)據(jù)或故障，不必感到奇怪，TCP/IP可以容許這些類型的錯(cuò)誤，并能夠自動(dòng)重發(fā)數(shù)據(jù)報(bào)。但如果累計(jì)的出錯(cuò)情況數(shù)目占到所接收的IP數(shù)據(jù)報(bào)相當(dāng)大的百分比，或者它的數(shù)目正迅速增加，那么就應(yīng)該使用netstat查一查為什么會(huì)出現(xiàn)這些情況了。

1．命令格式

netstat [-acCeFghilMnNoprstuvVwx][-A<網(wǎng)絡(luò)類型>][--ip]

2．命令功能

netstat用于顯示與IP、TCP、UDP和ICMP協(xié)議相關(guān)的統(tǒng)計(jì)數(shù)據(jù)，一般用于檢驗(yàn)本機(jī)各端口的網(wǎng)絡(luò)連接情況。

3．命令參數(shù)

  • -a或–all 顯示所有連線中的Socket。
  • -A<網(wǎng)絡(luò)類型>或–<網(wǎng)絡(luò)類型> 列出該網(wǎng)絡(luò)類型連線中的相關(guān)地址。
  • -c或–continuous 持續(xù)列出網(wǎng)絡(luò)狀態(tài)。
  • -C或–cache 顯示路由器配置的快取信息。
  • -e或–extend 顯示網(wǎng)絡(luò)其他相關(guān)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(wǎng)絡(luò)界面信息表單。
  • -l或–listening 顯示監(jiān)控中的服務(wù)器的Socket。
  • -M或–masquerade 顯示偽裝的網(wǎng)絡(luò)連線。
  • -n或–numeric 直接使用IP地址，而不通過域名服務(wù)器。
  • -N或–netlink或–symbolic 顯示網(wǎng)絡(luò)硬件外圍設(shè)備的符號(hào)連接名稱。
  • -o或–timers 顯示計(jì)時(shí)器。
  • -p或–programs 顯示正在使用Socket的程序識(shí)別碼和程序名稱。
  • -r或–route 顯示Routing Table。
  • -s或–statistice 顯示網(wǎng)絡(luò)工作信息統(tǒng)計(jì)表。
  • -t或–tcp 顯示TCP傳輸協(xié)議的連線狀況。
  • -u或–udp 顯示UDP傳輸協(xié)議的連線狀況。
  • -v或–verbose 顯示指令執(zhí)行過程。
  • -V或–version 顯示版本信息。
  • -w或–raw 顯示RAW傳輸協(xié)議的連線狀況。
  • -x或–unix 此參數(shù)的效果和指定”-A unix”參數(shù)相同。
  • –ip或–inet 此參數(shù)的效果和指定”-A inet”參數(shù)相同。

4．使用實(shí)例

實(shí)例1：無參數(shù)使用

命令：

netstat

輸出：

[yiibai@localhost ~]$ netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 localhost.localdoma:ssh 192.168.0.5:54835       ESTABLISHED
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ]         DGRAM                    13100    /run/systemd/shutdownd
unix  2      [ ]         DGRAM                    8385     /run/systemd/notify
unix  2      [ ]         DGRAM                    8387     /run/systemd/cgroups-agent
unix  5      [ ]         DGRAM                    8398     /run/systemd/journal/socket
unix  13     [ ]         DGRAM                    8400     /dev/log
unix  3      [ ]         STREAM     CONNECTED     19870
unix  3      [ ]         STREAM     CONNECTED     19850
unix  3      [ ]         STREAM     CONNECTED     19871
unix  3      [ ]         STREAM     CONNECTED     19830
unix  3      [ ]         STREAM     CONNECTED     16422
unix  3      [ ]         STREAM     CONNECTED     19852
unix  3      [ ]         STREAM     CONNECTED     16423    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19873
unix  3      [ ]         STREAM     CONNECTED     19874
unix  3      [ ]         STREAM     CONNECTED     15501
unix  3      [ ]         STREAM     CONNECTED     19847
unix  3      [ ]         STREAM     CONNECTED     19821
unix  3      [ ]         STREAM     CONNECTED     19849
unix  3      [ ]         STREAM     CONNECTED     19844
unix  3      [ ]         STREAM     CONNECTED     19820
unix  3      [ ]         STREAM     CONNECTED     19876
unix  3      [ ]         STREAM     CONNECTED     19833
unix  3      [ ]         STREAM     CONNECTED     19877
unix  2      [ ]         DGRAM                    16501
unix  3      [ ]         STREAM     CONNECTED     16576
unix  3      [ ]         STREAM     CONNECTED     19879
unix  3      [ ]         STREAM     CONNECTED     19829
unix  2      [ ]         DGRAM                    80277
unix  3      [ ]         STREAM     CONNECTED     19880
unix  3      [ ]         STREAM     CONNECTED     15803    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     19882
unix  3      [ ]         STREAM     CONNECTED     19263
unix  3      [ ]         STREAM     CONNECTED     19883
unix  3      [ ]         STREAM     CONNECTED     19853
unix  2      [ ]         DGRAM                    16412
unix  3      [ ]         STREAM     CONNECTED     19855
unix  3      [ ]         STREAM     CONNECTED     15802
unix  3      [ ]         STREAM     CONNECTED     19856
unix  3      [ ]         STREAM     CONNECTED     15502    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     80280
unix  3      [ ]         STREAM     CONNECTED     19858
unix  3      [ ]         STREAM     CONNECTED     19859
unix  3      [ ]         STREAM     CONNECTED     80281
unix  3      [ ]         STREAM     CONNECTED     19861
unix  3      [ ]         STREAM     CONNECTED     19843
unix  3      [ ]         STREAM     CONNECTED     19862
unix  3      [ ]         STREAM     CONNECTED     15457
unix  3      [ ]         STREAM     CONNECTED     19864
unix  3      [ ]         STREAM     CONNECTED     15613    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19865
unix  3      [ ]         STREAM     CONNECTED     19846
unix  2      [ ]         DGRAM                    80112
unix  3      [ ]         STREAM     CONNECTED     19867
unix  3      [ ]         STREAM     CONNECTED     16577    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19868
unix  2      [ ]         DGRAM                    15509
unix  3      [ ]         STREAM     CONNECTED     19264    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     16129    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     13393
unix  3      [ ]         STREAM     CONNECTED     19837
unix  2      [ ]         DGRAM                    13285
unix  3      [ ]         STREAM     CONNECTED     13530    /run/systemd/journal/stdout
unix  2      [ ]         DGRAM                    19784
unix  3      [ ]         STREAM     CONNECTED     16379    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     16160
unix  3      [ ]         STREAM     CONNECTED     13796    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     15732    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     15611
unix  3      [ ]         STREAM     CONNECTED     13777
unix  2      [ ]         DGRAM                    20011
unix  3      [ ]         STREAM     CONNECTED     16106    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     19840
......

說明：
從整體上看，netstat的輸出結(jié)果可以分為兩個(gè)部分：
一個(gè)是Active Internet connections，稱為有源TCP連接，其中”Recv-Q”和”Send-Q”指的是接收隊(duì)列和發(fā)送隊(duì)列。這些數(shù)字一般都應(yīng)該是0。如果不是則表示軟件包正在隊(duì)列中堆積。這種情況只能在非常少的情況見到。
另一個(gè)是Active UNIX domain sockets，稱為有源Unix域套接口(和網(wǎng)絡(luò)套接字一樣，但是只能用于本機(jī)通信，性能可以提高一倍)。
Proto顯示連接使用的協(xié)議,RefCnt表示連接到本套接口上的進(jìn)程號(hào),Types顯示套接口的類型,State顯示套接口當(dāng)前的狀態(tài),Path表示連接到套接口的其它進(jìn)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(tài)說明：

  • LISTEN：偵聽來自遠(yuǎn)方的TCP端口的連接請求
  • SYN-SENT：再發(fā)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(tài)包，檢查是否中招了)
  • SYN-RECEIVED：再收到和發(fā)送一個(gè)連接請求后等待對(duì)方對(duì)連接請求的確認(rèn)(如有大量此狀態(tài)，估計(jì)被flood攻擊了)
  • ESTABLISHED：代表一個(gè)打開的連接
  • FIN-WAIT-1：等待遠(yuǎn)程TCP連接中斷請求，或先前的連接中斷請求的確認(rèn)
  • FIN-WAIT-2：從遠(yuǎn)程TCP等待連接中斷請求
  • CLOSE-WAIT：等待從本地用戶發(fā)來的連接中斷請求
  • CLOSING：等待遠(yuǎn)程TCP對(duì)連接中斷的確認(rèn)
  • LAST-ACK：等待原來的發(fā)向遠(yuǎn)程TCP的連接中斷請求的確認(rèn)(不是什么好東西，此項(xiàng)出現(xiàn)，檢查是否被攻擊)
  • TIME-WAIT：等待足夠的時(shí)間以確保遠(yuǎn)程TCP接收到連接中斷請求的確認(rèn)
  • CLOSED：沒有任何連接狀態(tài)

實(shí)例2：列出所有端口

命令：

netstat -a

輸出：

[yiibai@localhost ~]$ netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN
tcp        0      0 localhost:smtp          0.0.0.0:*               LISTEN
tcp        0     52 localhost.localdoma:ssh 192.168.0.5:54835       ESTABLISHED
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN
tcp6       0      0 localhost:smtp          [::]:*                  LISTEN
udp        0      0 0.0.0.0:trnsprntproxy   0.0.0.0:*
udp        0      0 localhost:323           0.0.0.0:*
udp        0      0 0.0.0.0:bootpc          0.0.0.0:*
udp6       0      0 [::]:rnm                [::]:*
udp6       0      0 localhost:323           [::]:*
raw6       0      0 [::]:ipv6-icmp          [::]:*                  7
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     12805    /run/lvm/lvmpolld.socket
unix  2      [ ACC ]     SEQPACKET  LISTENING     12811    /run/udev/control
unix  2      [ ACC ]     STREAM     LISTENING     12827    /run/lvm/lvmetad.socket
unix  2      [ ]         DGRAM                    13100    /run/systemd/shutdownd
unix  2      [ ACC ]     STREAM     LISTENING     19872    public/showq
unix  2      [ ACC ]     STREAM     LISTENING     19842    private/rewrite
unix  2      [ ACC ]     STREAM     LISTENING     15231    /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     19845    private/bounce
unix  2      [ ACC ]     STREAM     LISTENING     19848    private/defer
unix  2      [ ACC ]     STREAM     LISTENING     19851    private/trace
unix  2      [ ACC ]     STREAM     LISTENING     19854    private/verify
unix  2      [ ACC ]     STREAM     LISTENING     19860    private/proxymap
unix  2      [ ACC ]     STREAM     LISTENING     19863    private/proxywrite
unix  2      [ ACC ]     STREAM     LISTENING     19866    private/smtp
unix  2      [ ACC ]     STREAM     LISTENING     19869    private/relay
unix  2      [ ACC ]     STREAM     LISTENING     19875    private/error
unix  2      [ ACC ]     STREAM     LISTENING     19878    private/retry
unix  2      [ ACC ]     STREAM     LISTENING     19881    private/discard
unix  2      [ ACC ]     STREAM     LISTENING     19884    private/local
unix  2      [ ACC ]     STREAM     LISTENING     19887    private/virtual
unix  2      [ ACC ]     STREAM     LISTENING     19890    private/lmtp
unix  2      [ ACC ]     STREAM     LISTENING     19893    private/anvil
unix  2      [ ACC ]     STREAM     LISTENING     19896    private/scache
unix  2      [ ACC ]     STREAM     LISTENING     19822    public/pickup
unix  2      [ ACC ]     STREAM     LISTENING     19832    public/cleanup
unix  2      [ ACC ]     STREAM     LISTENING     19835    public/qmgr
unix  2      [ ACC ]     STREAM     LISTENING     19857    public/flush
unix  2      [ ACC ]     STREAM     LISTENING     17836    /var/run/NetworkManager/private-dhcp
unix  2      [ ]         DGRAM                    8385     /run/systemd/notify
unix  2      [ ]         DGRAM                    8387     /run/systemd/cgroups-agent
unix  2      [ ACC ]     STREAM     LISTENING     19839    private/tlsmgr
......

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

實(shí)例3：顯示當(dāng)前UDP連接狀況

命令：

netstat -nu

輸出：

[yiibai@localhost ~]$ netstat -nu
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
[yiibai@localhost ~]$

實(shí)例4：顯示UDP端口號(hào)的使用情況

命令：

netstat -apu

輸出：

[yiibai@localhost ~]$ netstat -apu
(No info could be read for "-p": geteuid()=1000 but you should be root.)
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp        0      0 0.0.0.0:trnsprntproxy   0.0.0.0:*                           -
udp        0      0 localhost:323           0.0.0.0:*                           -
udp        0      0 0.0.0.0:bootpc          0.0.0.0:*                           -
udp6       0      0 [::]:rnm                [::]:*                              -
udp6       0      0 localhost:323           [::]:*                              -
[yiibai@localhost ~]$

實(shí)例5：顯示網(wǎng)卡列表

命令：

netstat -i

輸出：

[yiibai@localhost ~]$ 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    63831      0      0 0          6313      0      0      0 BMRU
lo       65536       19      0      0 0            19      0      0      0 LRU
[yiibai@localhost ~]$

實(shí)例6：顯示組播組的關(guān)系

命令：

netstat -g

輸出：

[yiibai@localhost ~]$ netstat -g
IPv6/IPv4 Group Memberships
Interface       RefCnt Group
--------------- ------ ---------------------
lo              1      all-systems.mcast.net
ens33           1      all-systems.mcast.net
lo              1      ff02::1
lo              1      ff01::1
ens33           1      ff02::1:ff35:dd8c
ens33           1      ff02::1
ens33           1      ff01::1
[yiibai@localhost ~]$

實(shí)例7：顯示網(wǎng)絡(luò)統(tǒng)計(jì)信息

命令：

netstat -s

輸出：

[yiibai@localhost ~]$ netstat -s
Ip:
    28607 total packets received
    0 forwarded
    0 incoming packets discarded
    4123 incoming packets delivered
    4143 requests sent out
    50 dropped because of missing route
Icmp:
    767 ICMP messages received
    402 input ICMP message failed.
    ICMP input histogram:
        destination unreachable: 152
        timeout in transit: 164
        echo requests: 402
        echo replies: 49
    467 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
        destination unreachable: 9
        echo request: 458
IcmpMsg:
        InType0: 49
        InType3: 152
        InType8: 402
        InType11: 164
        OutType3: 9
        OutType8: 458
Tcp:
    3 active connections openings
    3 passive connection openings
    0 failed connection attempts
    0 connection resets received
    1 connections established
    2880 segments received
    2548 segments send out
    0 segments retransmited
    0 bad segments received.
    0 resets sent
Udp:
    474 packets received
    2 packets to unknown port received.
    0 packet receive errors
    1160 packets sent
    0 receive buffer errors
    0 send buffer errors
UdpLite:
TcpExt:
    3 TCP sockets finished time wait in fast timer
    11 delayed acks sent
    1 delayed acks further delayed because of locked socket
    1 packets directly queued to recvmsg prequeue.
    1139 packet headers predicted
    441 acknowledgments not containing data payload received
    1356 predicted acknowledgments
    IPReversePathFilter: 1
    TCPRcvCoalesce: 69
    TCPOrigDataSent: 2427
IpExt:
    InNoRoutes: 5
    InMcastPkts: 435
    InBcastPkts: 24444
    OutBcastPkts: 402
    InOctets: 2452235
    OutOctets: 539407
    InMcastOctets: 13920
    InBcastOctets: 2027384
    OutBcastOctets: 33768
    InNoECTPkts: 28642
[yiibai@localhost ~]$

說明：
按照各個(gè)協(xié)議分別顯示其統(tǒng)計(jì)數(shù)據(jù)。如果我們的應(yīng)用程序(如Web瀏覽器)運(yùn)行速度比較慢，或者不能顯示W(wǎng)eb頁之類的數(shù)據(jù)，那么我們就可以用本選項(xiàng)來查看一下所顯示的信息。我們需要仔細(xì)查看統(tǒng)計(jì)數(shù)據(jù)的各行，找到出錯(cuò)的關(guān)鍵字，進(jìn)而確定問題所在。

實(shí)例8：顯示監(jiān)聽的套接口

命令：

netstat -l

輸出：

[yiibai@localhost ~]$ netstat -l
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN
tcp        0      0 localhost:smtp          0.0.0.0:*               LISTEN
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN
tcp6       0      0 localhost:smtp          [::]:*                  LISTEN
udp        0      0 0.0.0.0:trnsprntproxy   0.0.0.0:*
udp        0      0 localhost:323           0.0.0.0:*
udp        0      0 0.0.0.0:bootpc          0.0.0.0:*
udp6       0      0 [::]:rnm                [::]:*
udp6       0      0 localhost:323           [::]:*
raw6       0      0 [::]:ipv6-icmp          [::]:*                  7
Active UNIX domain sockets (only servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     12805    /run/lvm/lvmpolld.socket
unix  2      [ ACC ]     SEQPACKET  LISTENING     12811    /run/udev/control
unix  2      [ ACC ]     STREAM     LISTENING     12827    /run/lvm/lvmetad.socket
unix  2      [ ACC ]     STREAM     LISTENING     19872    public/showq
unix  2      [ ACC ]     STREAM     LISTENING     19842    private/rewrite
unix  2      [ ACC ]     STREAM     LISTENING     15231    /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     19845    private/bounce
unix  2      [ ACC ]     STREAM     LISTENING     19848    private/defer
unix  2      [ ACC ]     STREAM     LISTENING     19851    private/trace
unix  2      [ ACC ]     STREAM     LISTENING     19854    private/verify
unix  2      [ ACC ]     STREAM     LISTENING     19860    private/proxymap
unix  2      [ ACC ]     STREAM     LISTENING     19863    private/proxywrite
unix  2      [ ACC ]     STREAM     LISTENING     19866    private/smtp
unix  2      [ ACC ]     STREAM     LISTENING     19869    private/relay
unix  2      [ ACC ]     STREAM     LISTENING     19875    private/error
unix  2      [ ACC ]     STREAM     LISTENING     19878    private/retry
unix  2      [ ACC ]     STREAM     LISTENING     19881    private/discard
unix  2      [ ACC ]     STREAM     LISTENING     19884    private/local
unix  2      [ ACC ]     STREAM     LISTENING     19887    private/virtual
unix  2      [ ACC ]     STREAM     LISTENING     19890    private/lmtp
unix  2      [ ACC ]     STREAM     LISTENING     19893    private/anvil
unix  2      [ ACC ]     STREAM     LISTENING     19896    private/scache
unix  2      [ ACC ]     STREAM     LISTENING     19822    public/pickup
unix  2      [ ACC ]     STREAM     LISTENING     19832    public/cleanup
unix  2      [ ACC ]     STREAM     LISTENING     19835    public/qmgr
unix  2      [ ACC ]     STREAM     LISTENING     19857    public/flush
unix  2      [ ACC ]     STREAM     LISTENING     17836    /var/run/NetworkManager/private-dhcp
unix  2      [ ACC ]     STREAM     LISTENING     19839    private/tlsmgr
unix  2      [ ACC ]     STREAM     LISTENING     8395     /run/systemd/journal/stdout
unix  2      [ ACC ]     STREAM     LISTENING     12794    /run/systemd/private
[yiibai@localhost ~]$

實(shí)例9：顯示所有已建立的有效連接

命令：

netstat -n

輸出：

[yiibai@localhost ~]$ netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0     52 192.168.0.197:22        192.168.0.5:54835       ESTABLISHED
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ]         DGRAM                    13100    /run/systemd/shutdownd
unix  2      [ ]         DGRAM                    8385     /run/systemd/notify
unix  2      [ ]         DGRAM                    8387     /run/systemd/cgroups-agent
unix  5      [ ]         DGRAM                    8398     /run/systemd/journal/socket
unix  13     [ ]         DGRAM                    8400     /dev/log
unix  3      [ ]         STREAM     CONNECTED     19870
unix  3      [ ]         STREAM     CONNECTED     19850
unix  3      [ ]         STREAM     CONNECTED     19871
unix  3      [ ]         STREAM     CONNECTED     19830
unix  3      [ ]         STREAM     CONNECTED     16422
unix  3      [ ]         STREAM     CONNECTED     19852
unix  3      [ ]         STREAM     CONNECTED     16423    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19873
unix  3      [ ]         STREAM     CONNECTED     19874
unix  3      [ ]         STREAM     CONNECTED     15501
unix  3      [ ]         STREAM     CONNECTED     19847
unix  3      [ ]         STREAM     CONNECTED     19821
unix  3      [ ]         STREAM     CONNECTED     19849
unix  3      [ ]         STREAM     CONNECTED     19844
unix  3      [ ]         STREAM     CONNECTED     19820
unix  3      [ ]         STREAM     CONNECTED     19876
unix  3      [ ]         STREAM     CONNECTED     19833
unix  3      [ ]         STREAM     CONNECTED     19877
unix  2      [ ]         DGRAM                    16501
unix  3      [ ]         STREAM     CONNECTED     16576
unix  3      [ ]         STREAM     CONNECTED     19879
unix  3      [ ]         STREAM     CONNECTED     19829
unix  2      [ ]         DGRAM                    80277
unix  3      [ ]         STREAM     CONNECTED     19880
unix  3      [ ]         STREAM     CONNECTED     15803    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     19882
unix  3      [ ]         STREAM     CONNECTED     19263
unix  3      [ ]         STREAM     CONNECTED     19883
unix  3      [ ]         STREAM     CONNECTED     19853
unix  2      [ ]         DGRAM                    16412
unix  3      [ ]         STREAM     CONNECTED     19855
unix  3      [ ]         STREAM     CONNECTED     15802
unix  3      [ ]         STREAM     CONNECTED     19856
unix  3      [ ]         STREAM     CONNECTED     15502    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     80280
unix  3      [ ]         STREAM     CONNECTED     19858
unix  3      [ ]         STREAM     CONNECTED     19859
unix  3      [ ]         STREAM     CONNECTED     80281
unix  3      [ ]         STREAM     CONNECTED     19861
unix  3      [ ]         STREAM     CONNECTED     19843
unix  3      [ ]         STREAM     CONNECTED     19862
unix  3      [ ]         STREAM     CONNECTED     15457
unix  3      [ ]         STREAM     CONNECTED     19864
unix  3      [ ]         STREAM     CONNECTED     15613    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19865
unix  3      [ ]         STREAM     CONNECTED     19846
unix  2      [ ]         DGRAM                    80112
unix  3      [ ]         STREAM     CONNECTED     19867
unix  3      [ ]         STREAM     CONNECTED     16577    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19868
unix  2      [ ]         DGRAM                    15509
unix  3      [ ]         STREAM     CONNECTED     19264    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     16129    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     13393
unix  3      [ ]         STREAM     CONNECTED     19837
unix  2      [ ]         DGRAM                    13285
unix  3      [ ]         STREAM     CONNECTED     13530    /run/systemd/journal/stdout
unix  2      [ ]         DGRAM                    19784
unix  3      [ ]         STREAM     CONNECTED     16379    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     16160
unix  3      [ ]         STREAM     CONNECTED     13796    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     15732    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     15611
unix  3      [ ]         STREAM     CONNECTED     13777
unix  2      [ ]         DGRAM                    20011
unix  3      [ ]         STREAM     CONNECTED     16106    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     19840
unix  2      [ ]         DGRAM                    16231
unix  3      [ ]         STREAM     CONNECTED     16105
unix  3      [ ]         STREAM     CONNECTED     16320
unix  3      [ ]         STREAM     CONNECTED     19885
unix  3      [ ]         DGRAM                    13816
unix  3      [ ]         STREAM     CONNECTED     18433    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     16321    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19886
unix  3      [ ]         STREAM     CONNECTED     16161    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     16378
unix  3      [ ]         STREAM     CONNECTED     19888
unix  3      [ ]         STREAM     CONNECTED     15612
unix  3      [ ]         STREAM     CONNECTED     18432
unix  3      [ ]         STREAM     CONNECTED     19889
unix  2      [ ]         DGRAM                    16204
unix  3      [ ]         STREAM     CONNECTED     15731
unix  3      [ ]         STREAM     CONNECTED     19834
unix  3      [ ]         STREAM     CONNECTED     19891
unix  3      [ ]         STREAM     CONNECTED     19841
unix  3      [ ]         STREAM     CONNECTED     19836
unix  2      [ ]         DGRAM                    79889
unix  3      [ ]         STREAM     CONNECTED     19892
unix  2      [ ]         DGRAM                    16133
unix  3      [ ]         STREAM     CONNECTED     15152
unix  3      [ ]         STREAM     CONNECTED     16128
unix  3      [ ]         STREAM     CONNECTED     19894
unix  3      [ ]         STREAM     CONNECTED     19895
unix  3      [ ]         STREAM     CONNECTED     15153
unix  3      [ ]         STREAM     CONNECTED     19897
unix  3      [ ]         STREAM     CONNECTED     19898
unix  3      [ ]         DGRAM                    13817
unix  2      [ ]         DGRAM                    13797
unix  2      [ ]         DGRAM                    15143
[yiibai@localhost ~]$

實(shí)例10：顯示關(guān)于以太網(wǎng)的統(tǒng)計(jì)數(shù)據(jù)

命令：

netstat -e

輸出：

[yiibai@localhost ~]$ netstat -e
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode
tcp        0     52 localhost.localdoma:ssh 192.168.0.5:54835       ESTABLISHED root       80161
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ]         DGRAM                    13100    /run/systemd/shutdownd
unix  2      [ ]         DGRAM                    8385     /run/systemd/notify
unix  2      [ ]         DGRAM                    8387     /run/systemd/cgroups-agent
unix  5      [ ]         DGRAM                    8398     /run/systemd/journal/socket
unix  13     [ ]         DGRAM                    8400     /dev/log
unix  3      [ ]         STREAM     CONNECTED     19870
unix  3      [ ]         STREAM     CONNECTED     19850
unix  3      [ ]         STREAM     CONNECTED     19871
unix  3      [ ]         STREAM     CONNECTED     19830
unix  3      [ ]         STREAM     CONNECTED     16422
unix  3      [ ]         STREAM     CONNECTED     19852
unix  3      [ ]         STREAM     CONNECTED     16423    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19873
unix  3      [ ]         STREAM     CONNECTED     19874
unix  3      [ ]         STREAM     CONNECTED     15501
unix  3      [ ]         STREAM     CONNECTED     19847
unix  3      [ ]         STREAM     CONNECTED     19821
unix  3      [ ]         STREAM     CONNECTED     19849
unix  3      [ ]         STREAM     CONNECTED     19844
unix  3      [ ]         STREAM     CONNECTED     19820
unix  3      [ ]         STREAM     CONNECTED     19876
unix  3      [ ]         STREAM     CONNECTED     19833
unix  3      [ ]         STREAM     CONNECTED     19877
unix  2      [ ]         DGRAM                    16501
unix  3      [ ]         STREAM     CONNECTED     16576
unix  3      [ ]         STREAM     CONNECTED     19879
unix  3      [ ]         STREAM     CONNECTED     19829
unix  2      [ ]         DGRAM                    80277
unix  3      [ ]         STREAM     CONNECTED     19880
unix  3      [ ]         STREAM     CONNECTED     15803    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     19882
unix  3      [ ]         STREAM     CONNECTED     19263
unix  3      [ ]         STREAM     CONNECTED     19883
unix  3      [ ]         STREAM     CONNECTED     19853
unix  2      [ ]         DGRAM                    16412
unix  3      [ ]         STREAM     CONNECTED     19855
unix  3      [ ]         STREAM     CONNECTED     15802
unix  3      [ ]         STREAM     CONNECTED     19856
unix  3      [ ]         STREAM     CONNECTED     15502    /run/systemd/journal/stdout
unix  3      [ ]         STREAM     CONNECTED     80280
unix  3      [ ]         STREAM     CONNECTED     19858
unix  3      [ ]         STREAM     CONNECTED     19859
unix  3      [ ]         STREAM     CONNECTED     80281
unix  3      [ ]         STREAM     CONNECTED     19861
unix  3      [ ]         STREAM     CONNECTED     19843
unix  3      [ ]         STREAM     CONNECTED     19862
unix  3      [ ]         STREAM     CONNECTED     15457
unix  3      [ ]         STREAM     CONNECTED     19864
unix  3      [ ]         STREAM     CONNECTED     15613    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19865
unix  3      [ ]         STREAM     CONNECTED     19846
unix  2      [ ]         DGRAM                    80112
unix  3      [ ]         STREAM     CONNECTED     19867
unix  3      [ ]         STREAM     CONNECTED     16577    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     19868
unix  2      [ ]         DGRAM                    15509
unix  3      [ ]         STREAM     CONNECTED     19264    /var/run/dbus/system_bus_socket
uni
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