Linux修改默认22端口的方法 (linux 修改默认22)

Introduction

Linux is an open-source operating system that is widely used for servers and networking. The default SSH port for Linux systems is 22, which makes it a common target for hackers looking to gn unauthorized access to your system. By changing the default SSH port, you can make it harder for attackers to break in. In this article, we’ll explore different ways to change the default SSH port on a Linux system.

Method 1: Editing the SSH Configuration File

The most common method for changing the default SSH port on a Linux system is to edit the SSH configuration file. The configuration file is located at /etc/ssh/sshd_config. Open the file using your preferred text editor and look for the line #Port 22. Remove the “#” symbol to uncomment the line and change “22” to a port number of your choice. Save the file and exit the text editor.

Next, restart the SSH service for the changes to take effect. On most Linux systems, the command to restart the SSH service is systemctl restart sshd. If you’re using a different Linux distribution, check the documentation for the correct command.

Method 2: Using Firewall Rules

Another way to change the default SSH port on a Linux system is to use firewall rules. This method allows you to keep the default SSH port open for other services while using a different port for SSH.

First, create a new firewall rule to allow inbound traffic to the new SSH port. The command for this varies depending on the firewall you’re using. For example, on a system with UFW (Ubuntu Firewall), you can use the command ufw allow /tcp.

Next, create a port forwarding rule that redirects traffic from the new SSH port to the default SSH port. This ensures that external devices can still connect to your system using SSH. The command for this also varies depending on the firewall you’re using. For example, on a system with iptables, you can use the command iptables -A PREROUTING -t nat -i eth0 -p tcp –dport -j REDIRECT –to-port 22.

Finally, update the SSH configuration file to use the new SSH port. Follow the same steps as in Method 1 to edit the configuration file and change the default SSH port to the port you chose.

Method 3: Using SSH Tunneling

SSH tunneling is a technique that allows you to access network services securely. With SSH tunneling, you can create a secure connection between your local machine and a remote server. This method uses a different port for SSH, but it doesn’t require any changes to the SSH configuration file.

To use SSH tunneling, connect to the remote server using the command ssh -L :localhost: @. Replace , , , and with the appropriate values. For example, if you want to use port 2222 on your local machine for SSH, and the server is using port 22 for SSH, you would use the command ssh -L 2222:localhost:22 user@server_address.

Once you’re logged into the remote server, you can access any service on the server that is set up to listen on the default SSH port (port 22) using the tunnel port you specify. For example, if you want to access the web server running on the remote server, you can open a web browser on your local machine and navigate to localhost:2222, which will connect you securely to the web server running on the remote server.

Conclusion

相关问题拓展阅读：

• LINUX如何开启22好端口

LINUX如何开启22好端口

22端口

是ssh服务的，宴拿你只要启动ssh服务就可以了，可以执行命令“/etc/init.d/sshd start”。然后用netstat -antulp | grep ssh看是否能看到相关信息就可以了。

扩展资料

22端口就是

ssh端口

，PcAnywhere建立TCP和这一端口的连接可能是为了寻找粗型ssh。这一服务有许多弱点。如果配置成特定的模式，许多使用RSAREF库的版本有不少漏洞。

参考晌凳搭资料

22端口_百度百科

22端口

是基于linux下的SSH服务,我们要配置好ssh，然后通过ssh开启22端口。

操作步骤：

1、百度搜索“SSH Secure Shell 州纤谨Client”下载并安装。

2、打开我们安装好的SSH Secure Shell Client。

3、点击Profiles选择add profiles 并添加profils名称（自定义一个名字）

4、然后点击竖枯刚定义好的profiles，出现如下界面，填写远程linux的ip，

用户名

，密码，port 默认为22；Authentication 选择password，点击connect。

5、出现如下界面，表册基示连接成功。

6、执行命令“/etc/init.d/sshd start”。然后用netstat -antulp | grep ssh看是否能看到相关信息就可以了。

首先这台linux是否有全局静态IP？

如果有全局静态IP，你可以直接通过这个IP访问，没什么好设置的，当然linux下的防火墙要打开。至少开个22端口。

如果这台linux是通过拨号上网的，那就要用花生壳或者希网等动态域名服务，用希网做例子，先在希网(网址自己百度一下”谨李饥希网动态域名”)上注册个帐号扰昌，申请一个未用的动态域名，然后下载一个动态域名客户端，在linux上运行这个客服端，设置相应的帐号和域名，上网后就会自动更新域名IP，你在外地就可以用这个动态域名直接访问。

如果这台linux是通过网关上网的，那需要在这个网关做个设置，开个端口映射，将某个端口映射到linux机器的22端口。

如果这台linux是通过代理上网的，那比较麻烦，我也没碰到过，可以参考网关上网在网关上设置试试。

如果网关也是拨号，那么两个步骤都需要祥返做，网关上设置端口映射，linux机器上运行动态域名客户端。

22端口是ssh服务的，你只要启动ssh服务就可以了，可以执行命令“/etc/init.d/sshd  start”。然后用netstat -antulp | grep ssh看是否能看到相关信息就可以了。

Linux操作系统是基于UNIX操作系统发展而来的一种克隆系统，它诞生于1991 年的 10 月5 日（这是第裤扰一次正式向外公布链搭的时胡唤旦间）。以后借助于Internet网络，并通过全世界各地计算机爱好者的共同努力，已成为今天世界上使用最多的一种UNIX 类操作系统，并且使用人数还在迅猛增长。

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