How to prevent Telnet to a Server from specific IP Address

Hello,

How can I prevent telnet to a server from an specific IP Address?

Thanks

 

Hi, welcome to LinuxForum!

You could use the hosts.deny file:

telnet: 1.2.3.4

Is this a server facing the internet though? You should be uaing ssh instead.

Good luck,
Rob

 

I know this is an old-ish thread, but it is relevant to what Rob said.

I've been noticing some distros (i.e.: Arch Linux) switching to a different system of filtering traffic and getting rid of tcp_wrappers (hosts.deny/hosts.allow) completely. So, this is something to consider as well.

 

The safest and most powerful method would be denying it using iptables.

 

Depends. If it's an external connection then rejecting the connection at the router segment would be better and cause less overhead via iptables.