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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
相關(guān)問題拓展閱讀:
- LINUX如何開啟22好端口
LINUX如何開啟22好端口
22端口
是ssh服務的,宴拿你只要啟動ssh服務就可以了,可以執(zhí)行命令“/etc/init.d/sshd start”。然后用netstat -antulp | grep ssh看是否能看到相關(guān)信息就可以了。
擴展資料
22端口就是
ssh端口
,PcAnywhere建立TCP和這一端口的連接可能是為了尋找粗型ssh。這一服務有許多弱點。如果配置成特定的模式,許多使用RSAREF庫的版本有不少漏洞。
參考晌凳搭資料
22端口_百度百科
22端口
是基于linux下的SSH服務,我們要配置好ssh,然后通過ssh開啟22端口。
操作步驟:
1、百度搜索“SSH?Secure?Shell?州纖謹Client”下載并安裝。
2、打開我們安裝好的SSH?Secure?Shell?Client。
3、點擊Profiles選擇add?profiles?并添加profils名稱(自定義一個名字)
4、然后點擊豎枯剛定義好的profiles,出現(xiàn)如下界面,填寫遠程linux的ip,
用戶名
,密碼,port?默認為22;Authentication?選擇password,點擊connect。
5、出現(xiàn)如下界面,表冊基示連接成功。
6、執(zhí)行命令“/etc/init.d/sshd start”。然后用netstat -antulp | grep ssh看是否能看到相關(guān)信息就可以了。
首先這臺linux是否有全局靜態(tài)IP?
如果有全局靜態(tài)IP,你可以直接通過這個IP訪問,沒什么好設置的,當然linux下的防火墻要打開。至少開個22端口。
如果這臺linux是通過撥號上網(wǎng)的,那就要用花生殼或者希網(wǎng)等動態(tài)域名服務,用希網(wǎng)做例子,先在希網(wǎng)(網(wǎng)址自己百度一下”謹李饑希網(wǎng)動態(tài)域名”)上注冊個帳號擾昌,申請一個未用的動態(tài)域名,然后下載一個動態(tài)域名客戶端,在linux上運行這個客服端,設置相應的帳號和域名,上網(wǎng)后就會自動更新域名IP,你在外地就可以用這個動態(tài)域名直接訪問。
如果這臺linux是通過網(wǎng)關(guān)上網(wǎng)的,那需要在這個網(wǎng)關(guān)做個設置,開個端口映射,將某個端口映射到linux機器的22端口。
如果這臺linux是通過代理上網(wǎng)的,那比較麻煩,我也沒碰到過,可以參考網(wǎng)關(guān)上網(wǎng)在網(wǎng)關(guān)上設置試試。
如果網(wǎng)關(guān)也是撥號,那么兩個步驟都需要祥返做,網(wǎng)關(guān)上設置端口映射,linux機器上運行動態(tài)域名客戶端。
22端口是ssh服務的,你只要啟動ssh服務就可以了,可以執(zhí)行命令“/etc/init.d/sshd start”。然后用netstat -antulp | grep ssh看是否能看到相關(guān)信息就可以了。
Linux操作系統(tǒng)是基于UNIX操作系統(tǒng)發(fā)展而來的一種克隆系統(tǒng),它誕生于1991 年的 10 月5 日(這是第褲擾一次正式向外公布鏈搭的時胡喚旦間)。以后借助于Internet網(wǎng)絡,并通過全世界各地計算機愛好者的共同努力,已成為今天世界上使用最多的一種UNIX 類操作系統(tǒng),并且使用人數(shù)還在迅猛增長。
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