netstat的1基本用法有哪些
这篇文章将为大家详细讲解有关netstat的1基本用法有哪些，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
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显示当前所有的链接
root@ts:~# netstat -a Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 localhost:domain *:* LISTEN tcp 0 0 testforpaas.21vi:domain *:* LISTEN tcp 0 0 localhost:5433 *:* LISTEN tcp 0 0 localhost:smtp *:* LISTEN tcp 0 0 localhost:6010 *:* LISTEN
只显示tcp和dup
root@ts:~# netstat -tau
禁用反向域名解析，加快查询速度
默认情况下 netstat 会通过反向域名解析技术查找每个 IP 地址对应的主机名。这会降低查找速度。如果你觉得 IP 地址已经足够，而没有必要知道主机名，就使用 -n 选项禁用域名解析功能
root@ts:~# netstat -ant Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN tcp 0 0 172.16.16.1:53 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:5433 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:8123 0.0.0.0:* LISTEN
只列出监听中的连接
任何网络服务的后台进程都会打开一个端口，用于监听接入的请求。这些正在监听的套接字也和连接的套接字一样，也能被 netstat 列出来。使用 -l 选项列出正在监听的套接字
root@ts:~# netstat -tnl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN tcp 0 0 172.16.16.1:53 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:5433 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:8123 0.0.0.0:* LISTEN
获取进程名、进程号以及用户 ID
root@ts:~# netstat -tlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 localhost:domain *:* LISTEN 1080/DNSmasq tcp 0 0 testforpaas.21vi:domain *:* LISTEN 1080/dnsmasq tcp 0 0 localhost:5433 *:* LISTEN 11237/postgres tcp 0 0 localhost:smtp *:* LISTEN 1371/sendmail: MTA: tcp 0 0 localhost:6010 *:* LISTEN 9389/6
获取进程名和用户名
root@ts:~# netstat -tlpe Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State User Inode PID/Program name tcp 0 0 localhost:domain *:* LISTEN root 15870 1080/dnsmasq tcp 0 0 testforpaas.21vi:domain *:* LISTEN root 15868 1080/dnsmasq tcp 0 0 localhost:5433 *:* LISTEN postgres 130080 11237/postgres tcp 0 0 localhost:smtp *:* LISTEN root 17826 1371/sendmail: MTA
显示进程名和用户ID
root@ts:~# netstat -tlpen Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State User Inode PID/Program name tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 0 15870 1080/dnsmasq tcp 0 0 172.16.16.1:53 0.0.0.0:* LISTEN 0 15868 1080/dnsmasq tcp 0 0 127.0.0.1:5433 0.0.0.0:* LISTEN 116 130080 11237/postgres tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 0 17826 1371/sendmail: MTA
打印统计数据
netstat 可以打印出网络统计数据，包括某个协议下的收发包数量
root@ts:~# netstat -tns IcmpMsg: InType0: 93 InType3: 14674 InType11: 27391 OutType3: 18230 OutType8: 38060 Tcp: 23583 active connections openings 139747 passive connection openings 21350 failed connection attempts 1512 connection resets received 4 connections established 4263613 segments received 4716472 segments send out 171992 segments retransmited 55 bad segments received. 151266 resets sent
显示内核路由信息
root@ts:~# netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 172.16.16.62 0.0.0.0 UG 0 0 0 ens160 10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 br-9547a5f0faec 10.20.0.0 10.20.101.9 255.255.0.0 UG 0 0 0 ppp0
打印网络接口
netstat 也能打印网络接口信息，-i 选项就是为这个功能而生
root@ts:~# 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 br-9547a5f0faec 1500 0 55883292 0 0 0 89519216 0 0 0 BMRU docker0 1500 0 49 0 0 0 16 0 0 0 BMU ens160 1500 0 152552760 0 611 0 60254997 0 0 0 BMRU lo 65536 0 583345 0 0 0 583345 0 0 0 LRU ppp0 1354 0 2157 0 0 0 1679 0 0 0 MOPRU veth6dd978f 1500 0 12751092 0 0 0 18590019 0 0 0 BMRU
输出友好信息
root@ts:~# netstat -ei Kernel Interface table br-9547a5f0faec Link encap:Ethernet HWaddr 02:42:ee:4b:21:05 inet addr:10.0.0.1 Bcast:10.0.0.255 Mask:255.255.255.0 inet6 addr: fe80::42:eeff:fe4b:2105/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:55883460 errors:0 dropped:0 overruns:0 frame:0 TX packets:89519456 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:7839329499 (7.8 GB) TX bytes:199950345292 (199.9 GB) docker0 Link encap:Ethernet HWaddr 02:42:8f:b2:de:7a inet addr:172.17.0.1 Bcast:172.17.255.255 Mask:255.255.0.0 inet6 addr: fe80::42:8fff:feb2:de7a/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:49 errors:0 dropped:0 overruns:0 frame:0 TX packets:16 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1372 (1.3 KB) TX bytes:1368 (1.3 KB)
netstat 持续输出
root@ts:~# netstat -cu Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State udp6 0 0 localhost:37429 localhost:37429 ESTABLISHED
打印 active 状态的连接
netstat -atnp | grep ESTA
监视active状态连接
watch -d -n0 "netstat -atnp | grep ESTA"
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