netstat в CentOS

Introduction

Установка

Если вы применяете netstat и получаете ошибку

-bash: netstat: command not found

Значит не установлен пакет net-tools, в состав которого входит netstat.

sudo yum install -y net-tools

Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: centos.mirror.far.fi * extras: centos.mirror.far.fi * updates: centos.mirror.far.fi Resolving Dependencies --> Running transaction check ---> Package net-tools.x86_64 0:2.0-0.25.20131004git.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================================== Package Arch Version Repository Size ======================================================================================================================== Installing: net-tools x86_64 2.0-0.25.20131004git.el7 base 306 k Transaction Summary ======================================================================================================================== Install 1 Package Total download size: 306 k Installed size: 917 k Downloading packages: net-tools-2.0-0.25.20131004git.el7.x86_64.rpm | 306 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : net-tools-2.0-0.25.20131004git.el7.x86_64 1/1 Verifying : net-tools-2.0-0.25.20131004git.el7.x86_64 1/1 Installed: net-tools.x86_64 0:2.0-0.25.20131004git.el7 Complete!

Примеры

Какие порты слушаются

netstat -ltn

Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp6 0 0 :::22 :::* LISTEN tcp6 0 0 ::1:25 :::* LISTEN

Какие сервисы слушают

netstat -lt

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