[root@localhost ~]#vi /etc/services
…省略部分输出…
ftp-data 20/tcp
ftp-data 20/udp
# 21 is registered to ftp, but also used by fsp
ftp 21/tcp
ftp 21/udp
fsp fspd
#FTP服务的端口
…省略部分输出…
smtp 25/tcp mail
smtp 25/udp mail
#邮件发送信件的端口
…省略部分输出…
http 80/tcp www www-http #WorldWideWeb HTTP
http 80/udp www www-http #HyperText Transfer Protocol
#WWW服务的端口
…省略部分输出…
pop3 110/tcp pop-3
# POP version 3
pop3 110/udp pop-3
#邮件接收信件的端口
…省略部分输出…
[root@localhost ~]# netstat 选项
选项:
[root@localhost ~]# netstat -tlunp
#列出系统中所有已经启动的服务(已经监听的端口),但不包含已经连接的网络服务
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:53575 0.0.0.0:*
LISTEN
1200/rpc.statd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1181/rpcbind
tcp 0 0 0.0.0.0:22 O.O.O.O:* LISTEN 1405/sshd
tcp 0 0127.0.0.1:631 O.O.O.O:* LISTEN 1287/cupsd
tcp 0 0 127.0.0.1:25 O.O.O.O:* LISTEN 1481/master
tcp 0 0 :::57454 :::* LISTEN 1200/rpc.statd
tcp 0 0 :::111 :::* LISTEN 1181/rpcbind
tcp 0 0 :::22 :::* LISTEN 1405/sshd
tcp 0 0 ::1:631 :::* LISTEN 1287/cupsd
tcp 0 0 ::1:25 :::* LISTEN 1481/master
udp 0 0 0.0.0.0:58322 0.0.0.0:* 1276/avahi-daemon
udp 0 0 0.0.0.0:5353 O.O.O.O:* 1276/avahi-daemon
udp 0 0 0.0.0.0:111 O.O.O.O:* 1181/rpcbind
udp 0 0 0.0.0.0:631 O.O.O.O:* 1287/cupsd
udp 0 0 0.0.0.0:56459 0.0.0.0:* 1200/rpc.statd
udp 0 0 0.0.0.0:932 O.O.O.O:* 1181/rpcbind
udp 0 0 0.0.0.0:952 O.O.O.O:* 1200/rpc.statd
udp 0 0 :::111 :::* 1181/rpcbind
udp 0 0 :::47858 :::* 1200/rpc.statd
udp 0 0 :::932 :::* 1181/rpcbind
[root@localhost ~]# netstat -an
#查看所有的网络连接,包括已连接的网络服务、监听的网络服务和Socket套接字
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:53575 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 192.168.0.210:22 192.168.0.105:4868 ESTABLISHED
tcp 0 0 :::57454 :::* LISTEN
...省略部分输出...
udp 0 0 :::932 :::*
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
#Socket套接字输出,后面有具体介绍
Unix 2 [ ACC ] STREAM LISTENING 11712 /var/run/dbus/system_bus_socket
unix 2 [ ACC ] STREAM LISTENING 8450 @/com/ubuntu/upstart unix 7. [ ] DGRAM 8651 @/org/kernel/udev/udevd
unix 2 [ ACC ] STREAM LISTENING 11942 @/var/run/hald/dbus-b4QVLkivf1
...省略部分输出...
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