Question

如何修改linux 的SSH的默认端口号

Answer 1

Linux下修改端口号只需要更改相应服务的配置文件即可，下面以修改linux 的SSH服务的默认端口号22为例（把22修改我2501）：
1、修改/etc/ssh/sshd_config配置文件

[root@localhost ssh]# more sshd_config
# $OpenBSD: sshd_config,v 1.69 2004/05/23 23:59:53 dtucker Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/local/bin:/bin:/usr/bin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options change a
# default value.
#Port 22 //先把22注释掉
port 2501 //添加一个新的端口
#Protocol 2,1

2、重启ssh服务让修改的端口号生效

[root@localhost ~]# service sshd restart
Stopping sshd:[ OK ]
Starting sshd:[ OK ]

Answer 2

linux SSH默认端口是22，不修改的话存在一定的风险，要么是被人恶意扫描，要么会被人破解或者攻击，所以我们需要修改默认的SSH端口