======BIND - Notes======
[[http://www.zytrax.com/books/dns/|Zytrax.com - DNS for Rocket Scientists]] \\
=====Conditional Forwarding=====
To add conditional forwarding for a specific zone, add the following to named.conf:
<code>
zone "domain.com" in {
	type forward;
	forward only;
	forwarders { 10.1.1.1; 10.1.1.2; 10.1.1.3; };
};
</code>
Where "domain.com" is the domain to forward queries for and 10.1.1.1, 10.1.1.2, 10.1.1.3 are DNS servers to forward the queries to.

**NOTE** for this to work, recursion needs to be enabled!

Sources:\\
[[http://serverfault.com/questions/99101/conditional-dns-forwarding-with-named-on-linux|Server Fault - Conditional DNS forwarding with named on Linux]] \\
[[http://serverfault.com/questions/287652/bind9-forwarders-not-working-internal-dns-resolves-but-doesnt-forward-requests|Server Fault - BIND9 forwarders not working. Internal DNS resolves but doesn't forward requests it can't process]]

=====Empty Root Zone=====
To replace the default root hints with an empty root zone, for example to prevent resolving external non-forwarded domains when recursion is enabled, add the following to named.conf:
<code>
zone "." {
	type hint;
	file "db\empty.txt";
};
</code>
Make sure to point "file" to an empty file. On Unix-like operating systems you can use "/dev/null" instead.

Source: [[http://www.linuxquestions.org/questions/linux-networking-3/bind-config-forwarded-zones-not-working-as-expected-850159/|LinuxQuestions.org > Forums > Linux Forums > Linux - Networking > [SOLVED] Bind Config - Forwarded Zones not working as expected]]