djbdns-fwdzone

It's a patch to djbdns to allow dnscache to perform resolution or forwarding according to the query zone.

The latest version is djbdns-1.04-fwdzone. It works with djbdns-1.05 too.

How do I configure dnscache after applying the patch ?

The FORWARDONLY environment variable has been disabled. By default, dnscache only performs iterative queries, like in pre-1.03 versions.

To configure the root/servers directory of dnscache :

echo dns.server > my.iterative.zone
echo dns.cache > my.recursive.zone ; chmod +t my.recursive.zone

If my.zone has the sticky bit set, dnscache will perform recursive queries for the zone : my.zone must contain a list of DNS caches to whom dnscache will forward the queries.

If my.zone has the sticky bit cleared, dnscache will perform iterative queries for the zone : my.zone must contains a list of appropriate DNS servers.

If @ has the sticky bit set, dnscache will forward any queries it cannot find a preconfigured zone for. This is most useful behind a firewall with a split-DNS configuration.

Notes

DJB says that BSD/OS doesn't allow the sticky bit to be set on normal files. If you want to use djbdns-fwdzone on BSD/OS, or a system that suffers from the same limitation, please let me know.