![]() iptables sudo iptables -I INPUT -p tcp -dport 22 -s 192.168.0. TCP wrapper uses 2 files, /etc/hosts.allow and /etc/nyĮdit /etc/hosts.allow and add your subnet sshd : 192.168.0.Įdit /etc/ny, and deny all ALL : ALL You can also use the AllowUsers AllowUsers related, you can also change the port Port 1234Īs outlined on the forums post, you can use TCP Wrapper. Alternatively, if you wish to bind sshd service to selected IP address, this is possible by simply editing /etc/ssh/sshdconfig file. A private IP address is not routable over the internet. If You set a listen address on your subnet. ![]() You can set several options in /etc/ssh/sshd_config. At the end of this file, use the directive AllowUsers. ![]() You can use nano or your preferred text editor for this, as long as you open the file with root permissions. Start by opening a terminal and opening the SSH server configuration file. Be sure to disable UPnP and do not allow port forwarding. How to enable and disable SSH for user on Linux step by step instructions. To disable root logins, PermitRootLogin has to be set to no instead. To enable root logins via ssh, PermitRootLogin keyword has to be set to yes in the /etc/ssh/sshdconfig (OpenSSH daemon configuration) file. I will assume your ssh server is on subnet 192.168.0.0/16 with an ip address of 192.168.0.10, adjust accordingly ) Router Objective: Allow ssh root logins from a single IP address and disable root logins from other IP addresses. ![]() You can restrict access to a specific subnet in several ways. IMO the most important is to use ssh keys and disable password authentication. You could allow SSH for a specific IP by using a rule like: iptables -A INPUT -m state -state NEW,ESTABLISHED,RELATED -source x.x.x. You can restrict access to your ssh server in many ways. ![]()
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