修改远程端口号
修改远程端口号
远程端口是计算机网络通信协议中的一种重要概念典型的远程端口包括SSH、RDP、Telnet等。默认情况下这些远程端口都有默认的端口号。有些服务专用端口其他服务共用端口有时候出于安全考虑需要修改远程端口来增强安全性。
为什么需要修改远程端口号
网络攻击一直是网络安全领域的一个热门话题。修改远程端口号可以增加安全性并混淆攻击者使攻击者难以判断端口所提供的服务类型。如果攻击者无法确定从哪个端口进入系统那么攻击者就会失去进攻的突破口。对于那些拥有固定端口的著名远程服务来说加强安全性尤为重要。例如为了防止黑客使用SSH破坏系统可以修改SSH默认端口。
如何修改远程端口号
让我们以SSH服务为例。SSH是一种加密协议通常用于在不安全的网络上安全地登录远程计算机。默认情况下SSH运行在22号端口(或2087端口)。下面我们将介绍如何修改SSH远程端口号。
如果系统上没有SSH服务则必须先安装。如果已经安装了SSH服务则请按照以下步骤进行端口号修改：
1.备份ssh_config文件
在执行任何更改之前最好先备份ssh_config文件以备不时之需。在Linux系统中ssh_config文件位于/etc/ssh/目录下：
sudo cp /etc/ssh/ssh_config /etc/ssh/ssh_config.bak
备份完成后就可以开始更改SSH远程端口号了。
2.编辑ssh_config文件
使用nano或vim等文本编辑器打开ssh_config文件：
sudo nano /etc/ssh/ssh_config
在文件中找到以下行：
#Port 22
将其修改为：
Port XXXX
XXXX为要设置的新端口号。例如如果要将端口修改为2222那么应该将其更改为：
Port 2222
修改完成后保存并关闭文件。
3.编辑sshd_config文件
在完成ssh_config文件的更改之后还需要编辑sshd_config文件以使用新的SSH端口号。在Linux系统中sshd_config文件位于/etc/ssh/目录下。使用nano或vim等文本编辑器打开sshd_config文件：
sudo nano /etc/ssh/sshd_config
找到以下行：
#Port 22
将其修改为：
Port XXXX
XXXX是要更改为的新端口号例如如果要将端口号更改为2222则应将其更改为：
Port 2222
修改完成后保存并关闭文件。
4.重新启动SSH服务
使用以下命令重新启动SSH服务：
sudo service ssh restart
然后就完成了修改SSH远程端口号的过程。
Conclusion
远程端口号是网络通信协议中的重要组成部分。默认情况下这些端口都有默认的端口号。然而有时候需要修改远程端口来增强安全性。为了修改SSH远程端口号必须备份ssh_config文件编辑ssh_config文件以使用新端口编辑sshd_config文件以使用新端口并重新启动SSH服务。这样的操作可以增加安全性并混淆攻击者使攻击者难以判断服务类型从而有效地保护系统安全。
Changing a Remote Port Number
A remote port is an important concept in computer networking protocols. Typical remote ports include SSH, RDP, Telnet, and more. By default, these remote ports all have default port numbers. There are some services with dedicated ports, while other services share ports. For security reasons, it is sometimes necessary to modify the remote port number to enhance security.
Why Change the Remote Port Number?
Network attacks have always been a hot topic in the field of network security. Changing the remote port number can increase security and confuse attackers, making it difficult for attackers to determine the type of service provided on the port. If attackers cannot determine which port to enter the system from, they will lose a breakthrough point for attack. For well-known remote services with fixed ports, it is particularly important to enhance security. For example, to prevent hackers from using SSH to disrupt the system, the default SSH port can be modified.
How to Modify the Remote Port Number?
Let's take SSH service as an example. SSH is an encryption protocol commonly used to securely log into remote computers over an insecure network. By default, SSH runs on port 22 (or port 2087). Here we will introduce how to modify SSH remote port number.
If there is no SSH service on the system, it must be installed first. If the SSH service is already installed, please follow the following steps to modify the port number:
1. Back up the ssh_config file
Before making any changes, it is best to back up the ssh_config file for future reference. In the Linux system, the ssh_config file is located in the /etc/ssh/ directory:
sudo cp /etc/ssh/ssh_config /etc/ssh/ssh_config.bak
After the backup is complete, you can start to change the SSH remote port number.
2. Edit the ssh_config file
Open the ssh_config file with a text editor such as nano or vim:
sudo nano /etc/ssh/ssh_config
Find the following line in the file:
#Port 22
Change it to:
Port XXXX
XXXX is the new port number to be set. For example, if you want to change the port to 2222, then it should be changed to:
Port 2222
After the modification is complete, save and close the file.
3. Edit the sshd_config file
After completing the modifications to the ssh_config file, you also need to edit the sshd_config file to use the new SSH port number. In the Linux system, the sshd_config file is located in the /etc/ssh/ directory. Open the sshd_config file with a text editor such as nano or vim:
sudo nano /etc/ssh/sshd_config
Find the following line in the file:
#Port 22
Change it to:
Port XXXX
XXXX is the new port number to be changed to, for example, if you want to change the port number to 2222, then it should be changed to:
Port 2222
After the modification is complete, save and close the file.
4. Restart the SSH service
Restart the SSH service using the following command:
sudo service ssh restart
Then the process of changing the SSH remote port number is complete.
Conclusion
The remote port number is an important component of network communication protocols. By default, these ports all have default port numbers. However, sometimes it is necessary to modify the remote port to enhance security. To modify the SSH remote port number, you must back up the ssh_config file, edit the ssh_config file to use the new port, edit the sshd_config file to use the new port, and restart the SSH service. Such operations can increase security and confuse attackers, making it difficult for attackers to determine the type of service, thereby effectively protecting system security.
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