Google and most major search engines may penalize you for using meta tag or javascript redirects (not to mention that some systems may have javascript turned off). In my humble opinion it is always better to use mod_rewrite or a simple 301 redirect in .htaccess. It's cleaner, avoids the suggestion of unethical redirects and the Search Engines will love you.

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I use Country IP Blocks as added security for my networks and servers.