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    require IO::Socket::SSL;
    # first version with default CA on most platforms
    no warnings 'numeric';
    IO::Socket::SSL->VERSION(2.007);
  } && 'IO::Socket::SSL';

  my $nossl_warn = !$ssl_class &&
    'To use SSL please install IO::Socket::SSL with version>=2.007';

  # Code for detecting if we can use IPv6
  my $inet6_class = eval {
    require IO::Socket::IP;
    no warnings 'numeric';
    IO::Socket::IP->VERSION(0.25);
  } && 'IO::Socket::IP' || eval {
    require IO::Socket::INET6;
    no warnings 'numeric';
    IO::Socket::INET6->VERSION(2.62);
  } && 'IO::Socket::INET6';

  sub can_ssl   { $ssl_class };
  sub can_inet6 { $inet6_class };

  $IOCLASS = $ssl_class || $inet6_class || 'IO::Socket::INET';
  $family_key =
    ( $ssl_class ? $ssl_class->can_ipv6 : $inet6_class || '' )
      eq 'IO::Socket::IP'
      ? 'Family' : 'Domain';
}

our @ISA = ('Exporter','Net::Cmd',$IOCLASS);

use constant TELNET_IAC => 255;
use constant TELNET_IP  => 244;
use constant TELNET_DM  => 242;