BIND

BIND NOTE: You don’t have to install BIND, it is only required if you want to host your own authoritative zones locally (which I do). If you have no intention of doing this, you can skip this step entirely.

This guide is final stage in a three part series. If you haven’t already read Part 1: DoH using cloudflared and Part 2: Pi-hole be sure to check them out.

BIND

  • Install BIND To install BIND on an Ubuntu system, its as simple as the following:
apt-get -y install bind9
  • Configure BIND Now you need to configure it. You MUST do this if you’re running Pi-hole & cloudflared on the same server. If you dont, BIND will try to start using port 53 (default DNS port) which Pi-hole is already running on .
    In the folder /etc/bind you will find various configuration files. Using your favourite edit, modify the file /etc/bind/named.conf.options so that:
        // forwarders {
        //      0.0.0.0;
        // };

Is replaced with:

        forwarders {
                127.0.0.1 port 5353 ;
        };

And that:

listen-on-v6 { any; };

Is replaced with:

listen-on-v6 { none; };
listen-on port 5354 { 127.0.0.1; };
  • Setup your local zones
    Next, you will want to drop in any local or reverse zones into named.conf.local (also in /etc/bind). I prefer to break it up and also make a file called named.conf.reverse for my reverse lookups.

My file looks like this:

cat /etc/bind/named.conf.local
//
// Do any local configuration here
//

// Consider adding the 1918 zones here, if they are not used in your
// organization
//include "/etc/bind/zones.rfc1918";

zone "mycoolzone" {
        type master;
        file "mycoolzone.db";
};

Next you need to populate your zonefile. The default location for zonefiles on this installation will be /var/cache/bind. So my file looks something like this (its actually much larger but ive trimmed it down):

cat /var/cache/bind/mycoolzone.db
$ORIGIN .
$TTL 60       ; 1 minute
mycoolzone                   IN SOA  dns1. root.mycoolzone. (
                                2018102901 ; serial
                                3600       ; refresh (1 hour)
                                180        ; retry (3 minutes)
                                2419200    ; expire (4 weeks)
                                60      ; minimum (1 minute)
                                )
                        NS      dns-1.mycoolzone.
                        NS      dns-2.mycoolzone.
$ORIGIN mycoolzone.
usg                     A       192.168.0.1
lounge-switch           A       192.168.0.2
gaming-switch           A       192.168.0.3
study-switch            A       192.168.0.4
lounge-ap               A       192.168.0.5
study-ap                A       192.168.0.6
dns-1                   A       10.152.0.3
dns-2                   A       192.168.0.10
  • Start BIND At this point, it’s actually safe to start BIND. We have already changed the port it is going to listen on, so there shouldn’t be a conflict. To start BIND, simply issue the following command:

systemctl start bind9

Check its status by running:
systemctl status bind9

  • Setup forwarding for Pi-hole
    Now you need to setup Pi-hole to forward DNS queries it receives for the above “mycoolzone” domain to BIND. This is super simple and only requires the creation of one file. In the folder /etc/dnsmasq.d/ create a file called 05-local.conf The file simply needs to look like this:
    cat 05-local.conf
    server=/mycoolzone/127.0.0.1#5354
    

Once you’ve saved 05-local.conf, you will need to restart Pi-hole to pickup this configuration. Simply type: pihole restartdns

If you’ve completed everything correctly, you should now be able to query your DNS for mycoolzone:

dig @127.0.0.1 mycoolzone ns

; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 mycoolzone ns
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15928
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mycoolzone.                    IN      NS

;; ANSWER SECTION:
mycoolzone.             60      IN      NS      dns-1.mycoolzone.
mycoolzone.             60      IN      NS      dns-2.mycoolzone.

;; ADDITIONAL SECTION:
dns-1.mycoolzone.       60      IN      A       10.152.0.3
dns-2.mycoolzone.       60      IN      A       192.168.0.10

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Oct 30 11:43:02 AEDT 2018
;; MSG SIZE  rcvd: 111
  • To test everything out, just start querying your DNS for various domain names and check out the Query Log in Pi-hole.

You should see:

  1. Local zones forwarding to BIND
  2. Remote DNSSEC enabled zones forwarding to cloudflared and coming back as SECURE
  3. Remote non-DNSSEC enabled zones forwarding to cloudflared (coming back as INSECURE)
  4. Pi-holed enabled domains being black-holed.

complete.png

I hope you’ve enjoyed this quick tutorial. If you find any errors in the steps I have provided or have any feedback, please feel free to email me. I will probably write some future articles on how to improve this entire process, and realistically its probably not that hard to script up. If only I knew how to write scripts properly :-P

Enjoy!