Sorry for this question, but did you already install Net::Telnet? Without installing it, it won't work.
If you tell us which Unix/Linux you are trying to execute this on, then we could help you with the command for installing this module. Do you have root privileges on this machine?
In case Net::Telnet isn't installed yet:

In reply to Re: use of telnet in perl by rminner
in thread use of telnet in perl by varalaxmibbnl

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