Linux 修改linux的SSH的默认端口

安装完linux后，默认的情况下ssh是开放的，容易造到黑客攻击，简单有效的操作之一就是修改默认端口号

步骤一：修改/etc/ssh/sshd_config配置文件

找到行：Port 22 注释掉，添加行：Port其它端口号

builder:/mnt/disk/pcap# vim /etc/ssh/sshd_config

# Package generated configuration file

# See the sshd(8) manpage for details

# What ports, IPs and protocols we listen for

#Port 22

Port 50000

# Use these options to restrict which interfaces/protocols sshd will bind to

#ListenAddress ::

#ListenAddress 0.0.0.0

Protocol 2

# HostKeys for protocol version 2

HostKey /etc/ssh/ssh_host_rsa_key

HostKey /etc/ssh/ssh_host_dsa_key

#Privilege Separation is turned on for security

UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key

KeyRegenerationInterval 3600

ServerKeyBits 768

# Logging

注意：这里的端口修改会影响SCP、SSH等命令的使用，因为执行命令时使用的这里的端口

步骤二：重启服务

builder:/mnt/disk/pcap# service sshd restart