Major Upgrade - added very detailed configs for many scenarios, with lots of examples. The server is now fully functional for an authoritative master and a recursive/forwarding cacher. You can still mount over the /etc/bind and /var/bind directories and override everything yourself. This should help many users who did not know where to start with bind.

2018-02-12 23:35:24 -05:00
parent ca044d1672
commit 108554317e
20 changed files with 611 additions and 31 deletions
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+// Copy this file to /etc/bind/named.conf.options if you want to run bind as a
+// recursive DNS resolver. If you want to run an authoritative nameserver
+// instead, see Ventz's "example-configs/authoritative/named.conf.options"
+//
+// BIND supports using the same daemon as both authoritative nameserver and
+// recursive resolver; it supports this because it is the oldest and original
+// nameserver and so was designed before it was realized that combining these
+// functions is inadvisable.
+//
+// In actual fact, combining these functions is a very bad idea. It is thus
+// recommended that you run a given instance of BIND as either an authoritative
+// nameserver or recursive resolver, not both. The example configuration herein
+// provides a starting point for running a recursive resolver.
+//
+//
+// *** IMPORTANT ***
+// You should note that running an open DNS resolver (that is, a resolver which
+// answers queries from any globally routable IP) makes the resolver vulnerable
+// to abuse in the form of reflected DDoS attacks.
+//
+// These attacks are now widely prevalent on the open internet. Even if
+// unadvertised, attackers can and will find your resolver by portscanning the
+// global IPv4 address space.
+//
+// In one case the traffic generated using such an attack reached 300 Gb/s (!).
+//
+// It is therefore imperative that you take care to configure the resolver to
+// only answer queries from IP address space you trust or control. See the
+// "allow-recursion" directive below.
+//
+// Bear in mind that with these attacks, the "source" of a query will actually
+// be the intended target of a DDoS attack, so this only protects other networks
+// from attack, not your own; ideally therefore you should firewall DNS traffic
+// at the borders of your network to eliminate spoofed traffic.
+//
+// This is a complex issue and some level of understanding of these attacks is
+// advisable before you attempt to configure a resolver.
+
+options {
+	directory "/var/bind";
+
+	// Specify a list of CIDR masks which should be allowed to issue recursive
+	// queries to the DNS server. Do NOT specify 0.0.0.0/0 here; see above.
+	allow-recursion {
+		127.0.0.1/32;
+	};
+
+	// If you want this resolver to itself resolve via means of another recursive
+	// resolver, uncomment this block and specify the IP addresses of the desired
+	// upstream resolvers.
+	//forwarders {
+	//	8.8.8.8;
+	//	8.8.4.4;
+	//};
+
+	// By default the resolver will attempt to perform recursive resolution itself
+	// if the forwarders are unavailable. If you want this resolver to fail outright
+	// if the upstream resolvers are unavailable, uncomment this directive.
+	//forward only;
+
+	// Configure the IPs to listen on here.
+	listen-on { 127.0.0.1; };
+	listen-on-v6 { none; };
+
+	// If you have problems and are behind a firewall:
+	//query-source address * port 53;
+
+	pid-file "/var/run/named/named.pid";
+
+	// Removing this block will cause BIND to revert to its default behaviour
+	// of allowing zone transfers to any host (!). There is no need to allow zone
+	// transfers when operating as a recursive resolver.
+	allow-transfer { none; };
+};
+
+// Briefly, a zone which has been declared delegation-only will be effectively
+// limited to containing NS RRs for subdomains, but no actual data beyond its
+// own apex (for example, its SOA RR and apex NS RRset). This can be used to
+// filter out "wildcard" or "synthesized" data from NAT boxes or from
+// authoritative name servers whose undelegated (in-zone) data is of no
+// interest.
+// See http://www.isc.org/products/BIND/delegation-only.html for more info
+
+//zone "COM" { type delegation-only; };
+//zone "NET" { type delegation-only; };
+
+zone "." IN {
+	type hint;
+	file "named.ca";
+};
+
+zone "localhost" IN {
+	type master;
+	file "pri/localhost.zone";
+	allow-update { none; };
+	notify no;
+};
+
+zone "127.in-addr.arpa" IN {
+	type master;
+	file "pri/127.zone";
+	allow-update { none; };
+	notify no;
+};