Reliable Penguin

Need to block am IP address from your server? Here's an IPTables command:

/sbin/iptables -I INPUT -s w.x.y.z -j DROP

where w.x.y.z is the IP address to be blocked.

Here's a way to block and address with just the route command:

/sbin/route add -host w.x.y.z reject

Create a file at /etc/httpd/conf.d/no-etags.conf with the following:

Header unset ETag
FileETag None

Then of course restart Apache.

Here's a discussion on why you may want to turn ETags off:

http://www.askapache.com/htaccess/apache-speed-etags.html

Here's a good rule set for forcing use of a preferred url:

RewriteCond %{HTTP_HOST} !^desired\.domain\.name(:.*)?$  [NC]
RewriteCond %{HTTP_HOST} !^$
RewriteRule ^/(.*) http://desired.domain.name/$1 [L,R=301] 

This version of the canonical rewrite expands on the original found here:

http://httpd.apache.org/docs/2.2/rewrite/rewrite_guide.html#canonicalhost

by adding:

1. redirects domains with suffixes (not just prefixes) back to the canonical host; and
2. allows Host request headers to contain port specifiers (which is allowed by RFC2616 section 14.24)

as suggested here:

http://colby.id.au/node/99

and by using a 301 redirect as recommended by Google here:

http://www.google.com/support/webmasters/bin/answer.py?answer=44231&hl=en