December 2002
Intermediate to advanced
192 pages
5h 30m
English
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DNS
Like FreeBSD, OpenBSD has a nameserver installed by default. This allows for easy configuration of a caching nameserver. A caching nameserver is not authoritative for any domain; it simply serves as a recursive resolver for clients.
OpenBSD runs an older yet heavily audited version of BIND, the
popular nameserver from ISC. While many other operating systems are
shipping with BIND 9.x, OpenBSD 3.1 runs BIND 4.9.8. Version 4 BIND
installations use legacy configuration files and maintenance
mechanisms. For more information on BIND, see http://www.isc.org/products/BIND/. By
default, the nameserver on OpenBSD runs in a
chroot'd
jail.
Tip
chroot is a mechanism for changing what a
process considers to be the root of the file system. A
chroot'd process will, for
instance, think that /var/named is really /.
chroot'ing a process greatly
reduces the risk to the host in the event of a compromise. A properly
chroot'd jail will keep
attackers limited to the jail. They will not be able to break out to
affect the rest of the system.
To turn on OpenBSD’s caching nameserver, modify the
named_flags option to be the following:
named_flags=""
After the next reboot, the system will be running a caching
nameserver. From a client on the network you should be able to use a
utility such as nslookup to verify the process
is acting as expected.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.