Isn't it irritating when you change the IP address of a
Web server and discover that, months later, requests still
rain in from search engines and other sites which have linked
to the absolute IP address rather than your site name?
Redirex is a small, lightweight Perl server which intercepts
HTTP requests sent to the old address and redirects them
to the site's new home.
New version 2.0 (July 2004) is compatible with Perl
5.6 and above in “strict” mode, easier to configure, and
permits control over caching of server redirections.