如何允许一个 IP 地址进行 SSH 连接

最近学到了 Linux 可以通过 /etc/hosts.allow 和 /etc/hosts.deny 对远程访问进行控制。

• https://www.crybit.com/allow-ssh-connection-on-server/

How to allow an IP address for SSH connection?

• Step 1 : SSH to server as root user.
• Step 2 : Open /etc/hosts.allow file using your favorite text editor.

To allow one IP address to server:

sshd : IP-Address

To allow more than one IP addresses:

sshd : IP-Address1, IP-Address2, IP-Address3

To allow IP ranges:

sshd : 33.*.*.*
sshd : 66.66.*.*

To allow all IP addresses for SSH:

sshd : ALL

Or

ALL : ALL

We can also control the same from /etc/hosts.deny file by adding the keyword “ALLOW.” See the example pasted below:

Example:

# vim /etc/hosts.deny

sshd : ALL : ALLOW