Re: selective forwarding resolver that isn't being selective

Mike <[email protected]> Wed, 20 Aug 2025 18:53:55 +0000

Newsgroups	gmane.network.dns.bind9.user
Message-ID	<aKYZw8FMLp+rqk0u__29514.3946817674$1755716234$gmane$org@70-36-235-101.dsl.static.fusionbroadband.com>

Doug Freed wrote:
> It would be helpful if we could see your actual BIND configuration

Thanks for replying.  Attached.

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named.conf (text/plain, 78 B)

include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";

named.conf.options (text/plain, 2.2 KB)

acl internals { localhost; /* internal CIDRs */; }; // internal systems

options {
	version " ";
	allow-recursion { internals; };
	notify no;
	directory "/var/cache/bind";

	// If there is a firewall between you and nameservers you want
	// to talk to, you may need to fix the firewall to allow multiple
	// ports to talk.  See http://www.kb.cert.org/vuls/id/800113

	listen-on-v6 { any; };

	/* From http://www.sput.nl/internet/dns-morons.html to address
	 * DNS rebinding attacks. */

	deny-answer-addresses {
	  0.0.0.0;                                   // unconfigured
	  10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16; // RFC 1918
	  169.254.0.0/16;                            // RFC 3927

	  ::/80;
	  64:ff9b::/96;  // RFC 6052
	  2001:db8::/32; // reserved for documentation
	  fc00::/7;      // ULA
	  fe80::/10;     // link local
	  fec0::/10;     // site local
	} except-from { "internal"; };

	deny-answer-aliases { "internal"; };

	response-policy {
		zone "rpz.internal";
	};
};

logging {
	channel "info_channel" {
		file "/var/log/info.log" versions unlimited size 20m;
		severity debug;
		print-time iso8601-utc;
		print-category yes;
		print-severity yes;
	};
	channel "queries_channel" {
		file "/var/log/queries.log" versions unlimited size 20m;
		severity debug;
		print-time iso8601-utc;
		print-severity yes;
	};
	channel "query_errors_channel" {
		file "/var/log/query-errors.log" versions unlimited size 20m;
		severity debug;
		print-time iso8601-utc;
		print-severity yes;
	};
	channel "xfer_channel" {
		file "/var/log/xfer.log" versions unlimited size 20m;
		severity debug;
		print-time iso8601-utc;
		print-category yes;
		print-severity yes;
	};

	category "config" { "info_channel"; };
	category "default" { "info_channel"; };
	category "general" { "info_channel"; };
	category "unmatched" { "info_channel"; };
	category "security" { "info_channel"; };

	category "queries" { "queries_channel"; };
	category "query-errors" { "query_errors_channel"; };

	category "notify"   { "xfer_channel"; };
	category "xfer-in"  { "xfer_channel"; };
	category "xfer-out" { "xfer_channel"; };
};

key "rndc-key" {
	algorithm hmac-sha256;
	secret "...";
};

controls {
	inet 127.0.0.1 port 953
		allow { 127.0.0.1; } keys { "rndc-key"; };
};

named.conf.local (text/plain, 2.5 KB)

//
// Do any local configuration here
//

view "internal" {
	match-clients { internals; };
	allow-query { internals; };
	forwarders {};
	recursion yes;

	// RPZ for internal overrides
	zone "rpz.internal" {
		type primary;
		file "/etc/bind/rpz.internal";
		allow-query { localhost; };
		allow-transfer { none; };
	};

	// prime the server with knowledge of the root servers
	zone "." { type hint; file "/etc/bind/db.root"; };

	// some public domains of mine
	zone "example1.com" { type primary; file "/etc/bind/example1.com"; };
	zone "example2.com" { type primary; file "/etc/bind/example2.com"; };
	zone "example1.org" { type primary; file "/etc/bind/example1.org"; };

	// Kubernetes--use CoreDNS
	zone "....in-addr.arpa" { type forward; forward only; forwarders { /* CoreDNS service IP */; }; };
	zone "....in-addr.arpa" { type forward; forward only; forwarders { /* CoreDNS service IP */; }; };
	zone "....ip6.arpa"     { type forward; forward only; forwarders { /* CoreDNS service IP */; }; };
	zone "....ip6.arpa"     { type forward; forward only; forwarders { /* CoreDNS service IP */; }; };

	// internal network zones
	zone "....in-addr.arpa" { type primary; file "/etc/bind/db...."; };
	zone "....d.f.ip6.arpa" { type primary; file "/etc/bind/db.fd..."; };
	zone "internal"         { type primary; file "/etc/bind/internal"; };

	// be authoritative for the localhost forward and reverse zones, and for
	// broadcast zones as per RFC 1912
	zone "localhost"        { type primary; file "/etc/bind/db.local"; };
	zone "127.in-addr.arpa" { type primary; file "/etc/bind/db.127"; };
	zone "0.in-addr.arpa"   { type primary; file "/etc/bind/db.0"; };
	zone "255.in-addr.arpa" { type primary; file "/etc/bind/db.255"; };
};

view "external" {
	recursion no;

	// RPZ for internal overrides
	zone "rpz.internal" {
		type primary;
		file "/etc/bind/rpz.internal";
		allow-query { localhost; };
		allow-transfer { none; };
	};

	// prime the server with knowledge of the root servers
	zone "." {
		type hint;
		file "/etc/bind/db.root";
	};

	zone "example1.com" {
		type primary;
		file "/etc/bind/example1.com";
		notify yes;
		allow-transfer { /* secondary server IP */; };
		also-notify { /* secondary server IP */; };
	};

	zone "example2.com" {
		type primary;
		file "/etc/bind/example2.com";
		notify yes;
		allow-transfer { /* secondary server IP */; };
		also-notify { /* secondary server IP */; };
	};

	zone "example1.org" {
		type primary;
		file "/etc/bind/example1.org";
		notify yes;
		allow-transfer { /* secondary server IP */; };
		also-notify { /* secondary server IP */; };
	};
};