Apart from the typo, it's because you missed out CurrentControlSet... the full "path" should be HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters.
P.S. The value is a hash so if you wanna look into it you'd be better with:
#!perl
use strict;
use warnings;
use Data::Dumper;
use Win32::TieRegistry;
my $key = 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\
+Parameters';
my $parameter = $Registry->{$key};
print Dumper($parameter);
Although that will give you _loads_ of info!
larryk
perl -le "s,,reverse killer,e,y,rifle,lycra,,print"