Ubuntu 18.04

Install the packages

$ sudo apt-get update $ sudo apt install xinetd telnetd telnet -y 

Create a new file /etc/xinetd.d/telnet with following entries:

service telnet { disable = no flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID } 

Then restart xinetd service

$ sudo /etc/init.d/xinetd restart 

Time to test from server side:

$ telnet localhost 

CentOS-7

Install the packages

$ sudo yum clean all && yum repolsit $ sudo yum install xinetd telnet-server telnet -y 

Enable and start the services

$ sudo systemctl enable telnet.socket $ sudo systemctl start telnet.socket 

Allow telnet (TCP/23) through the firewall

$ sudo firewall-cmd --permanent --add-port=23/tcp $ sudo firewall-cmd --reload 

Test from server side

$ telnet localhost 

Ubuntu 18.04

Install the packages

$ sudo apt-get update $ sudo apt install xinetd telnetd telnet -y 

Create a new file /etc/xinetd.d/telnet with following entries:

service telnet { disable = no flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID } 

Then restart xinetd service

$ sudo /etc/init.d/xinetd restart 

Time to test from server side:

$ telnet localhost 

CentOS-7

Install the packages

$ sudo yum clean all && yum repolist $ sudo yum install xinetd telnet-server telnet -y 

Enable and start the services

$ sudo systemctl enable telnet.socket $ sudo systemctl start telnet.socket 

Allow telnet (TCP/23) through the firewall

$ sudo firewall-cmd --permanent --add-port=23/tcp $ sudo firewall-cmd --reload 

Test from server side

$ telnet localhost 

You dont need telnetd, but you need telnet-server. You should execute the following command instead:

$ sudo apt install xinetd telnet-server 

Enable and start the telnet service

$ sudo systemctl enable telnet.socket $ sudo systemctl start telnet.socket 

Ubuntu 18.04

Install the packages

$ sudo apt-get update $ sudo apt install xinetd telnetd telnet -y 

Create a new file /etc/xinetd.d/telnet with following entries:

service telnet { disable = no flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID } 

Then restart xinetd service

$ sudo /etc/init.d/xinetd restart 

Time to test from server side:

$ telnet localhost 

CentOS-7

Install the packages

$ sudo yum clean all && yum repolsit $ sudo yum install xinetd telnet-server telnet -y 

Enable and start the services

$ sudo systemctl enable telnet.socket $ sudo systemctl start telnet.socket 

Allow telnet (TCP/23) through the firewall

$ sudo firewall-cmd --permanent --add-port=23/tcp $ sudo firewall-cmd --reload 

Test from server side

$ telnet localhost