Block / Restrict Telnet Users by TCP Wrapper

By | 29/02/2012

Telnet users can also be block by tcp wrapper setup. In default root can’t login through telnet , by editing the following file root can able to login through telnet

#cd /etc/pam.d

#vim remote

#auth required pam_securetty.so /*this is 2nd line in this line*/
/*Delete this line*/

 

Telnet Login

#telnet 192.168.1.10

#login: root

#password : *****

NOTE: Without editing the above remote file, root can able to login

 

Block Telnet Users

#vim /etc/hosts.deny

Allows only the 192.168.1.10 IP address

in.telnetd: 192.168.1.10

 

#vim /etc/hosts.deny

Blocks all IP address except 192.168.1.10

in.telnetd: ALL EXCEPT 192.168.1.10

 

#vim /etc/hosts.deny
Block all IP address from the network

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192.168.1.0/24

in.telnetd: ALL EXCEPT 192.168.1.0/24
in.telnetd: ALL EXCEPT 192.168.1.0/255.255.255.0

 

#vim /etc/hosts.deny

Blocks all IP address, no on ecna login through telnet

intelnetd: ALL

 

 

 

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