Your last line ("this creates a one way connection...") is incorrect-what you have done at that point is to make a connection to the remote server and authenticate. At that point, you can then do the following (adapted from the Net::SSH::Perl documentation):
my($stdout, $stderr, $exit) = $ssh->cmd($cmd);
# ... other code here ...
$ssh->cmd($cmd);
# ... other code here ...
Hope that helps.
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