Netstat 命令用于显示各种网络相关信息，如网络连接，路由表，接口状态 (Interface Statistics)，masquerade 连接，多播成员 (Multicast Memberships) 等等。本文提供 10 个非常实用的 Netstat 命令实例。
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1. 列出所有端口 (包括监听和未监听的)
列出所有端口 netstat -a
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netstat -a | more [root@diancai1 ~]# netstat -a | more Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:5666 *:* LISTEN tcp 0 0 *:rsync *:* LISTEN tcp 0 0 diancai1.com:47537 115.239.224.60:60000 ESTABLISHED tcp 0 0 *:6080 *:* LISTEN tcp 0 0 localhost.localdomain:8035 *:* LISTEN tcp 0 0 *:8039 *:* LISTEN tcp 0 0 *:7080 *:* LISTEN tcp 0 0 *:rsync *:* LISTEN tcp 0 0 localhost.localdomain:8015 *:* LISTEN tcp 0 0 *:webcache *:* LISTEN tcp 0 0 *:personal-agent *:* LISTEN tcp 0 0 *:8019 *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:glrpc *:* LISTEN tcp 0 0 localhost.localdomain:8025 *:* LISTEN tcp 0 0 *:8029 *:* LISTEN tcp 0 0 *:esri_sde *:* LISTEN tcp 0 48 diancai1.com:ssh localhost:57648 ESTABLISHED tcp 0 0 diancai1.com:55624 localhost:mysql ESTABLISHED tcp 0 0 diancai1.com:53528 localhost:mysql ESTABLISHED tcp 0 0 diancai1.com:53529 localhost:mysql ESTABLISHED tcp 0 0 diancai1.com:53484 localhost:mysql ESTABLISHED tcp 0 0 diancai1.com:53483 localhost:mysql ESTABLISHED tcp 0 0 diancai1.com:53482 localhost:mysql ESTABLISHED
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列出所有 tcp 端口 netstat -at
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[root@diancai1 ~]# netstat -at Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:5666 *:* LISTEN tcp 0 0 *:rsync *:* LISTEN tcp 0 0 diancai1.com:47537 115.239.224.60:60000 ESTABLISHED tcp 0 0 *:6080 *:* LISTEN tcp 0 0 localhost.localdomain:8035 *:* LISTEN tcp 0 0 *:8039 *:* LISTEN tcp 0 0 *:7080 *:* LISTEN tcp 0 0 *:rsync *:* LISTEN tcp 0 0 localhost.localdomain:8015 *:* LISTEN tcp 0 0 *:webcache *:* LISTEN tcp 0 0 *:personal-agent *:* LISTEN tcp 0 0 *:8019 *:*
