linux netstat Netstat是在内核中访问网络连接状态及其相关信息的程序，它能提供TCP连接，TCP和UDP监听，进程内存管理的相关报告。

时间： 2023-12-21 admin IT培训

在Internet RFC标准中，Netstat的定义是： Netstat是在内核中访问网络连接状态及其相关信息的程序，它能提供TCP连接，TCP和UDP监听，进程内存管理的相关报告。

Netstat是控制台命令,是一个监控TCP/IP网络的非常有用的工具，它可以显示路由表、实际的网络连接以及每一个网络接口设备的状态信息。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。

如果你的计算机有时候接收到的数据包导致出错数据或故障，你不必感到奇怪，TCP/IP可以容许这些类型的错误，并能够自动重发数据包。但如果累计的出错情况数目占到所接收的IP数据报相当大的百分比，或者它的数目正迅速增加，那么你就应该使用Netstat查一查为什么会出现这些情况了。

一般用netstat -an 来显示所有连接的端口并用数字表示。

netstat命令的功能是显示网络连接、路由表和网络接口信息，可以让用户得知有哪些网络连接正在运作。 [1] 使用时如果不带参数，netstat显示活动的 TCP 连接。

Linux:~$ netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:2601 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:2602 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:2604 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:2605 0.0.0.0:* LISTEN
tcp 0 0 192.168.144.201:22222 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:2707 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:2616 0.0.0.0:* LISTEN
tcp 0 37596 192.168.144.201:34116 192.168.144.201:22222 ESTABLISHED
tcp 0 0 192.168.144.201:2707 192.168.141.190:63680 ESTABLISHED
tcp 0 1880 192.168.144.201:22222 192.168.144.201:34116 ESTABLISHED
tcp 0 396440 100.100.1.2:55924 100.100.1.1:8888 ESTABLISHED
tcp 0 232 192.168.144.201:2707 192.168.141.190:63585 ESTABLISHED
tcp6 0 0 ::1:2603 :::* LISTEN
tcp6 0 0 ::1:2606 :::* LISTEN
tcp6 0 0 :::2707 :::* LISTEN
udp 0 6912 0.0.0.0:33862 0.0.0.0:*
udp 0 0 100.100.1.2:123 0.0.0.0:*
udp 0 0 10.0.0.1:123 0.0.0.0:*
udp 0 0 192.168.144.201:123 0.0.0.0:*
udp 0 0 127.0.0.1:123 0.0.0.0:*
udp 0 0 0.0.0.0:123 0.0.0.0:*
udp6 0 0 fe80::f954:355c:c49:123 :::*
udp6 0 0 fe80::20c:29ff:fe05:123 :::*
udp6 0 0 ::1:123 :::*
udp6 0 0 fe80::20c:29ff:fe05:123 :::*
udp6 0 0 :::123 :::*
raw 0 0 0.0.0.0:89 0.0.0.0:* 7
raw6 195840 0 :::58 :::* 7
raw6 0 0 :::89 :::* 7
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 10277 /var/run/frr/bgpd.vty
unix 2 [ ACC ] STREAM LISTENING 6982 /var/run/frr/zserv.api
unix 2 [ ACC ] STREAM LISTENING 6985 /var/run/frr/zebra.vty
unix 2 [ ] DGRAM 5455 /run/systemd/notify
unix 2 [ ACC ] STREAM LISTENING 5457 /run/systemd/private
unix 2 [ ACC ] STREAM LISTENING 7002 /var/run/frr/ripngd.vty
unix 2 [ ACC ] STREAM LISTENING 7014 /var/run/frr/ospf6d.vty
unix 2 [ ] DGRAM 5480 /run/systemd/shutdownd
unix 18 [ ] DGRAM 5482 /run/systemd/journal/dev-log
unix 2 [ ACC ] SEQPACKET LISTENING 5486 /run/udev/control
unix 2 [ ACC ] STREAM LISTENING 7025 /var/run/frr/staticd.vty
unix 2 [ ACC ] STREAM LISTENING 5489 /run/systemd/journal/stdout
unix 5 [ ] DGRAM 5491 /run/systemd/journal/socket
unix 2 [ ] DGRAM 5549 /run/systemd/journal/syslog
unix 2 [ ACC ] STREAM LISTENING 9929 /var/run/frr/ripd.vty
unix 2 [ ACC ] STREAM LISTENING 6608 /run/uuidd/request
unix 2 [ ACC ] STREAM LISTENING 9938 /var/run/frr/ospfd.vty
unix 2 [ ACC ] STREAM LISTENING 6611 /var/run/dbus/system_bus_socket
unix 2 [ ACC ] STREAM LISTENING 6614 /run/acpid.socket
unix 2 [ ACC ] STREAM LISTENING 8170 /var/run/frr/watchfrr.vty
unix 3 [ ] STREAM CONNECTED 10355
unix 3 [ ] STREAM CONNECTED 7030 /var/run/frr/ospf6d.vty
unix 2 [ ] DGRAM 15677
unix 3 [ ] STREAM CONNECTED 10356
unix 3 [ ] STREAM CONNECTED 10363 /var/run/frr/ripd.vty
unix 2 [ ] DGRAM 10332
unix 3 [ ] STREAM CONNECTED 15838
unix 3 [ ] STREAM CONNECTED 7028 /var/run/frr/zebra.vty
unix 2 [ ] DGRAM 15828
unix 3 [ ] STREAM CONNECTED 10357
unix 3 [ ] STREAM CONNECTED 10364 /var/run/frr/ripngd.vty
unix 2 [ ] DGRAM 14638
unix 3 [ ] STREAM CONNECTED 10360
unix 3 [ ] STREAM CONNECTED 7029 /var/run/frr/bgpd.vty
unix 3 [ ] STREAM CONNECTED 15837
unix 3 [ ] STREAM CONNECTED 9949 /var/run/frr/staticd.vty
unix 3 [ ] STREAM CONNECTED 10359
unix 2 [ ] DGRAM 10347
unix 2 [ ] DGRAM 10300
unix 3 [ ] STREAM CONNECTED 99994
unix 2 [ ] DGRAM 10317
unix 3 [ ] STREAM CONNECTED 10358
unix 3 [ ] STREAM CONNECTED 9948 /var/run/frr/ospfd.vty
unix 3 [ ] STREAM CONNECTED 102454 /run/systemd/journal/stdout
unix 3 [ ] STREAM CONNECTED 10361
unix 2 [ ] DGRAM 11969
unix 3 [ ] STREAM CONNECTED 10279
unix 3 [ ] STREAM CONNECTED 6994 /var/run/frr/zserv.api
unix 3 [ ] STREAM CONNECTED 6992 /var/run/frr/zserv.api
unix 2 [ ] DGRAM 11934
unix 2 [ ] DGRAM 10286
unix 2 [ ] DGRAM 1910
unix 2 [ ] DGRAM 8117
unix 3 [ ] STREAM CONNECTED 10280
unix 2 [ ] DGRAM 11411
unix 3 [ ] STREAM CONNECTED 7996
unix 3 [ ] STREAM CONNECTED 7995
unix 3 [ ] DGRAM 1925
unix 3 [ ] DGRAM 1924
unix 2 [ ] DGRAM 11617
unix 3 [ ] STREAM CONNECTED 6717
unix 3 [ ] STREAM CONNECTED 7998 /var/run/dbus/system_bus_socket
unix 3 [ ] DGRAM 9908
unix 3 [ ] STREAM CONNECTED 6997 /var/run/frr/zserv.api
unix 2 [ ] DGRAM 6960
unix 2 [ ] DGRAM 6904
unix 3 [ ] STREAM CONNECTED 15492 /run/systemd/journal/stdout
unix 3 [ ] STREAM CONNECTED 9416
unix 3 [ ] STREAM CONNECTED 7997 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 9940
unix 3 [ ] STREAM CONNECTED 8795 /run/systemd/journal/stdout
unix 3 [ ] STREAM CONNECTED 9931
unix 2 [ ] DGRAM 9410
unix 3 [ ] STREAM CONNECTED 6763 /run/systemd/journal/stdout
unix 3 [ ] STREAM CONNECTED 14330
unix 3 [ ] STREAM CONNECTED 9129 /var/run/frr/zserv.api
unix 3 [ ] STREAM CONNECTED 6762
unix 2 [ ] DGRAM 9882
unix 3 [ ] STREAM CONNECTED 6722
unix 3 [ ] DGRAM 9907
unix 3 [ ] STREAM CONNECTED 9933 /var/run/frr/zserv.api
unix 3 [ ] STREAM CONNECTED 8626 /run/systemd/journal/stdout
unix 3 [ ] STREAM CONNECTED 7004
unix 3 [ ] STREAM CONNECTED 8712 /run/systemd/journal/stdout
unix 2 [ ] DGRAM 18848
unix 3 [ ] STREAM CONNECTED 8711
unix 3 [ ] STREAM CONNECTED 18852
unix 3 [ ] STREAM CONNECTED 8625
unix 3 [ ] STREAM CONNECTED 8524
unix 3 [ ] STREAM CONNECTED 7722 /run/systemd/journal/stdout
unix 3 [ ] STREAM CONNECTED 18851
unix 3 [ ] STREAM CONNECTED 7027
unix 3 [ ] STREAM CONNECTED 7016
unix 3 [ ] STREAM CONNECTED 9135 /var/run/frr/zserv.api
unix 3 [ ] STREAM CONNECTED 9132 /var/run/frr/zserv.api
Linux:~$