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I'm searching for an approach permitting access on an apache web server, but only for clients that have an IP address which machtes on an IP address that is assigned to a dynamic host address.

arbyter
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If I understood your question correctly (you want something like Allow from somehost.dyndns.org) then no, this is not possible.
Apache gets the request from the IP and does a reverse DNS lookup, this will not match and the client will be denied.

The only solution I could think of would be to write a cronjob which periodically resolves the dyndns record and writes an .htaccess file allowing only that IP.
But that is rather hackish and I would much rather simply implement authentication instead.

faker
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