December 2002
Intermediate to advanced
192 pages
5h 30m
English
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DNS
In the DHCP configuration outlined in the previous section, the clients are sent the upstream provider’s DNS server IP addresses. This is the simplest way to set things up, but you might want to go to a step further and run your own DNS server.
There are two common reasons to run your own DNS server: caching DNS lookups for performance reasons or hosting a domain. DNS caching can improve performance by handling repeated DNS lookups locally. This probably won’t make a very big difference unless your upstream DNS server has noticeable delays. The proper hosting of a domain is a more advanced topic; if you wish to do this, you should consult the DNS server documentation for information on configuration.
By running DNS as an additional service on the gateway, a new
potential point of vulnerability is introduced. BIND, the most widely
used DNS server, has a history of security issues. To help limit
exposure, it should be set up in a chroot
environment. The latest version of BIND and documentation can be
found at http://www.isc.org/products/BIND/.
FreeBSD has a caching DNS server that can be enabled fairly easily. Set the following:
named_enable="YES"
in /etc/rc.conf, and it will start at boot time.
Note that this is not chrooted by default. The
man pages will provide information on how to set this up to be
chrooted.
If you do decide to configure the gateway with a caching DNS server,
make sure you change the DHCP configuration file to give the proper
gateway IP addresses in option domain-name-server ...
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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.