I am working on a proprietary protocol. The structure requires additional IP addresses to be passed. I have had success useing the following snippet.

pack("a4", inet_aton("192.168.1.1"));
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This works for the majority of IP's except when there is a 10 in the first, second or thrid position in the IP ie 10.10.10.1. This packs correctly, but fails after sending it to the server. Where it does the following.

unpack("a4", inet_ntoa($buffer);
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I am including a sample client:

use IO::Socket;
$IP_Address = '10.10.10.1';

$buffer = inet_aton($IP_Address);
$buffer = pack("a4", $buffer);

my $sock = new IO::Socket::INET (
                                 PeerAddr => 'localhost',
                                 PeerPort => '7070',
                                 Proto    => 'tcp'
                                 );

die "Could not create socket: $!\n" unless $sock;
print $sock $buffer;
close($sock);
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Here is a sample server that exhibits the same error.

use IO::Socket;

my $new_sock;
my $sock = new IO::Socket::INET (
                                 LocalHost => 'localhost',
                                 LocalPort => '7070',
                                 Proto => 'tcp',
                                 Listen => 1,
                                 Reuse => 1,
                                 );
die "Could not create socket: $!\n" unless $sock;

while ($new_sock = $sock->accept()){

  while(defined($buffer = <$new_sock>)) {

  $buffer = unpack("a4", $buffer);
  $buffer = inet_ntoa($buffer);
  print $buffer, "\n";
  }

}

close($sock);
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Thank You for your wisdom.