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An updated caching-nameserver package that fixes a bug is now available under Red Hat Enterprise Linux.

The caching-nameserver package includes the configuration files that will make BIND, the DNS name server, act as a simple caching nameserver. Many users on dial-up connections use this package along
with BIND for this purpose. The address of L root server have been updated. All users of caching-nameserver should upgrade to this updated package, which resolves this issue.

To update just enter the following command as root user:
# up2date -u

nsupdate is really cool tool.

nsupdate is used to submit Dynamic DNS Update requests as defined in RFC2136 to a name server. This allows resource records to be added or removed from a zone without manually editing the zone file. A single update request can contain requests to add or remove more than one resource recored.

=> Using the dynamic DNS editor: nsupdate