I have Apache 2.2.4 server with a lot of messages like this in the access_log:

::1 - - [15/May/2010:19:55:01 +0200] "OPTIONS * HTTP/1.0" 400 543
::1 - - [15/May/2010:20:22:17 +0200] "OPTIONS * HTTP/1.0" 400 543
::1 - - [15/May/2010:20:24:58 +0200] "OPTIONS * HTTP/1.0" 400 543
::1 - - [15/May/2010:20:25:55 +0200] "OPTIONS * HTTP/1.0" 400 543
::1 - - [15/May/2010:20:27:14 +0200] "OPTIONS * HTTP/1.0" 400 543

These are the "internal dummy connections" as explained on this page:

http://wiki.apache.org/httpd/InternalDummyConnection

The page also hits my main problem: "In 2.2.6 and earlier, in certain configurations, these requests may hit a heavy-weight dynamic web page and cause unnecessary load on the server. You can avoid this by using mod_rewrite to respond with a redirect when accessed with that specific User-Agent or IP address."

Well, obviously I cannot use UserAgent because I minimized the server signature, but I could use IP address. However, I don't have a clue what should the RewriteCond and RewriteRule look for IPv6 address ::1.

The website where this runs is using CodeIgniter, so there is already the following .htaccess in place, I just need to add to it:

RewriteEngine on
RewriteCond %{REQUEST_URI} ^/system.*
RewriteRule ^(.*)$ /index.php?/$1 [G]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?/$1 [L]

Any idea how to write this .htaccess rule?