netstat 命令参数

This program is obsolete. Replacement for netstat is ss. Replacement for netstat -r is ip route. Replacement for netstat -i is ip -s link. Replacement for netstat -g is ip maddr.

netstat -t -l 查看监听的 tcp
netstat -t --wide
netstat -an |grep :8080 端口8080 上的连接 (有些外部的)

只针对 linux, Mac 和 win 有些不一样.

• a all
• r 显示路由表
• s statistics
• n 不做主机和端口转换, 数字形式 number
• c continuous print
• e extend 多显示 owner
• p 显示 program
• l listening
  --wide 不截取

状态:
ESTABLISHED
The socket has an established connection.
SYN_SENT
The socket is actively attempting to establish a connection.
SYN_RECV
A connection request has been received from the network.
FIN_WAIT1
The socket is closed, and the connection is shutting down.
FIN_WAIT2
Connection is closed, and the socket is waiting for a shutdown from the remote end.
TIME_WAIT
The socket is waiting after close to handle packets still in the network.
CLOSED
The socket is not being used.
CLOSE_WAIT
The remote end has shut down, waiting for the socket to close.
LAST_ACK
The remote end has shut down, and the socket is closed. Waiting for acknowledgement.
LISTEN
The socket is listening for incoming connections. Such sockets are not included in the output unless you specify the --listening (-l) or --all (-a) option.
CLOSING
Both sockets are shut down but we still don't have all our data sent.
UNKNOWN
The state of the socket is unknown.

https://en.wikipedia.org/wiki/Netstat
https://linux.die.net/man/8/netstat
https://www.computerhope.com/unix/unetstat.htm