I will take a slightly different approach than Jorge (while his approach does control access to a single vty by a single host, I am not sure that this is what you were really asking for - especially since it does not address what happens on vty 0).
I will suggest that you configure vty 0 to accept the telnet connection (depending on how your router is configured - especially whether you are using aaa or not - the configuration that you posted would be fine, and that under all the other vty lines you configure:
This will prevent any telnet connection from becoming active on any other vty. Be aware that on many routers there are vty 0 4, but on some versions there are vty 0 15, and could possibly be other numbers of vty lines. So check how many are in your router and configure tham as I have suggested.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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