A new update is available for Fedora Core - Fedora Core 4 Update: caching-nameserver-7.3-4.FC4. Here the announcement:

Fedora Update Notification
FEDORA-2005-1173
2005-12-19
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Product : Fedora Core 4
Name : caching-nameserver
Version : 7.3
Release : 4.FC4
Summary : The configuration files for setting up a caching name server.
Description :
The caching-nameserver package includes the configuration files which
will make BIND, the DNS name server, act as a simple caching nameserver.
Many users on dialup connections use this package along with BIND for
such a purpose.

If you would like to set up a caching name server, you'll need to install
the caching-nameserver package; you'll also need to install bind.

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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/

9f6207b046c247bf4acb2cf950447010 SRPMS/caching-nameserver-7.3-4.FC4.src.rpm
912731de278d27a8c2502e8e899d8592 x86_64/caching-nameserver-7.3-4.FC4.noarch.rpm
912731de278d27a8c2502e8e899d8592 i386/caching-nameserver-7.3-4.FC4.noarch.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.