Bind9 (DNS) Installation 24.04LTS: Difference between revisions

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Shut down the service for configuration
Shut down the service for configuration


  systemctl bind9 stop
  systemctl stop bind9.service


== Update bind to use IP 4 addresses only ==
== Update bind to use IP 4 addresses only ==

Revision as of 12:54, 18 March 2024

This will configure split DNS. This will allow you to create a local DNS zone "scottworld.net" which will handle all local requests. It will be an extension of scottworld.net which is the registered domain. Requests for scottworld.net hosts (and other traffic) that are not local are forwarded out to the internet.

Install bind.

apt install bind9

Shut down the service for configuration

systemctl stop bind9.service

Update bind to use IP 4 addresses only

This will prevent a whole bunch of IP6 fails and your log filling up.

nano /etc/default/named
#
# run resolvconf?
RESOLVCONF=no

# startup options for the server
OPTIONS="-u bind -4"


Define the zones for the local domain:

We will now edit named.conf.local and set up the zones we are using for DNS.

sudo nano /etc/bind/named.conf.local

Add a zones and their location for the local domain and the access rights. Here we define 2 zones, a forward and reverse zone.

acl "scottworld-lan" {
        localnets;
        10.10.0.0/24;
};

zone "scottworld.net" {
        type master;
        file "/var/lib/bind/zones/db.scottworld.net";
        check-names ignore;
        allow-update { scottworld-lan; };
};

zone "3.10.in-addr.arpa" {
        type master;
        file "/var/lib/bind/zones/db.10.3";
        check-names ignore;
        allow-update { scottworld-lan; };
};

Set up a Zones Folder

Create a zone folder to host the zone files in /var/lib/bind/

mkdir /var/lib/bind/zones

Configure the local forward lookup zone

nano /var/lib/bind/zones/db.scottworld.net

Here we also add to STATIC hosts as A records (contained in the zone file)

$ORIGIN .
$TTL 604800     ; 1 week
scottworld.net          IN SOA  solaris.scottworld.net. mark.scottworld.net. (
                                1          ; serial
                                604800     ; refresh (1 week)
                                86400      ; retry (1 day)
                                2419200    ; expire (4 weeks)
                                604800     ; minimum (1 week)
                                )
                        NS      solaris.scottworld.net.
                        A       10.3.200.1
$ORIGIN scottworld.net.
asteroid                A       10.3.101.2
backcam                 A       10.3.50.31
$TTL 3600       ; 1 hour
BOONBOX                 A       10.3.100.3
                        DHCID   ( AAEBUghHomWwx+ZARvqg4ZdLpKhPOPgpW1kz/5rUBZVV
                                mB8= ) ; 1 1 32
$TTL 604800     ; 1 week
comet                   A       10.3.200.3
cyd                     A       10.3.50.24
ddhomerun               A       10.3.50.1
$TTL 3600       ; 1 hour
DESKTOP-Q3C0NFT         A       10.3.100.37
                        DHCID   ( AAEB61rcJVQOhiz+yeEwQOHXAznDG8ZCwXkyxMdAyUJR
                                tSY= ) ; 1 1 32
$TTL 604800     ; 1 week
Dining-Main             A       10.3.50.5
Dining-Uplighter1       A       10.3.50.22
Dining-Uplighter2       A       10.3.50.18
doorbell                A       10.3.50.32
envoy                   A       10.3.50.2
$TTL 3600       ; 1 hour
esp32-E35268            A       10.3.100.97
                        DHCID   ( AAEBxPfgRxFRi+N12m5RY648gCiQabwBlRTHFI4iINRJ
                                Uro= ) ; 1 1 32
$TTL 604800     ; 1 week
ESP_B8019D              A       10.3.50.6
frontcam                A       10.3.50.30
gateway                 A       10.3.1.1
$TTL 1200       ; 20 minutes
jupiter                 A       10.3.100.37
$TTL 604800     ; 1 week
Landing-Main            A       10.3.50.10
Lounge-Colin            A       10.3.50.21
Lounge-Floor            A       10.3.50.16
Lounge-Larry            A       10.3.50.15
Lounge-Main             A       10.3.50.4
Mame                    A       10.3.50.20
mars                    A       10.3.200.2
$TTL 1200       ; 20 minutes
mimas                   A       10.3.101.3
$TTL 604800     ; 1 week
mqtt                    CNAME   mars
$TTL 1200       ; 20 minutes
Neptune                 A       10.3.100.13
$TTL 604800     ; 1 week
patio                   A       10.3.50.6
$TTL 1200       ; 20 minutes
phobos                  A       10.3.100.148
$TTL 604800     ; 1 week
porch                   A       10.3.50.7
PowerCord1              A       10.3.50.19
printer                 A       10.3.101.100
$TTL 3600       ; 1 hour
$TTL 604800     ; 1 week
roku                    A       10.3.50.9
$TTL 1200       ; 20 minutes
saturn                  A       10.3.100.12
$TTL 604800     ; 1 week
scottcloud              A       10.3.200.1
scotthome               CNAME   solaris
$TTL 3600       ; 1 hour
scottscreen             A       10.3.50.3
$TTL 3600       ; 1 hour
$TTL 604800     ; 1 week
solaris                 A       10.3.200.1
titan                   A       10.3.100.21
$TTL 604800     ; 1 week
wiki                    CNAME   scottworrs.cluster020.hosting.ovh.net.
wikimin                 CNAME   solaris
www                     CNAME   scottworrs.cluster020.hosting.ovh.net.
yamaha                  A       10.3.50.8

Configure the local reverse lookup zone

nano /var/lib/bind/zones/db.10.3

$ORIGIN .
$TTL 604800     ; 1 week
3.10.in-addr.arpa       IN SOA  solaris.scottworld.net. mark\@scottworld.net. (
                                1123       ; serial
                                604800     ; refresh (1 week)
                                86400      ; retry (1 day)
                                2419200    ; expire (4 weeks)
                                604800     ; minimum (1 week)
                                )
                        NS      solaris.
$ORIGIN 1.3.10.in-addr.arpa.
$TTL 3600       ; 1 hour
1                       PTR     gateway.scottworld.net.
$ORIGIN 200.3.10.in-addr.arpa.
$TTL 36000       ; 10 hours
1                       PTR     solaris.scottworld.net.
2                       PTR     mars.scottworld.net.
3                       PTR     comet.scottworld.net.

; also list other computers

Allow the openVPN network to used locally cached DNS entries

nano named.conf.options

add this line to the options file.

allow-query-cache { localnets; 10.3.0.0/24; };

Set folder permissions and test

Set the permissions on the folder / zone files so BIND can write to them.

chown bind:bind /var/lib/bind/zones
chmod 770 /var/lib/bind/zones -R

Restart BIND and DHCP to use the new settings:

service bind9 restart
service isc-dhcp-server restart


Test that the dns lookups works with the local server:

dig google.com

The response should be:

root@solaris:~# dig google.com

; <<>> DiG 9.8.1-P1 <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36080
;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;google.com.                    IN      A

;; ANSWER SECTION:
google.com.             32      IN      A       173.194.34.69
google.com.             32      IN      A       173.194.34.65
google.com.             32      IN      A       173.194.34.71
google.com.             32      IN      A       173.194.34.70
google.com.             32      IN      A       173.194.34.73
google.com.             32      IN      A       173.194.34.78
google.com.             32      IN      A       173.194.34.66
google.com.             32      IN      A       173.194.34.68
google.com.             32      IN      A       173.194.34.67
google.com.             32      IN      A       173.194.34.64
google.com.             32      IN      A       173.194.34.72

;; Query time: 1412 msec
;; SERVER: 192.168.3.1#53(192.168.3.1)
;; WHEN: Mon Apr 30 10:15:47 2012
;; MSG SIZE  rcvd: 204

Test that all of your computers are listed with the following command:

host -l scottworld.net

The output should list all of your entered hosts: Example:

scottworld.net name server solaris.scottworld.net.
scottworld.net has address 192.168.3.200
scottworld.net has IPv6 address ::1
adwebmail.scottworld.net has address 213.171.195.75
android_832db9ab2532e69b.scottworld.net has address 192.168.3.11
Brians-iPhone-2.scottworld.net has address 192.168.3.48
jupiter.scottworld.net has address 192.168.3.15
Keiths-iPhone.scottworld.net has address 192.168.3.47
mail.scottworld.net has address 213.171.216.114
mythboxBED.scottworld.net has address 192.168.3.16
mythboxtv.scottworld.net has address 192.168.3.49
ns.scottworld.net has address 192.168.3.200
PRINTER.scottworld.net has address 192.168.3.44
smtp.scottworld.net has address 213.171.216.50
solaris.scottworld.net has address 192.168.3.200
solaris2.scottworld.net has address 192.168.3.201
venus.scottworld.net has address 192.168.3.14
webmail.scottworld.net has address 213.171.216.114
www.scottworld.net has address 88.208.252.199
ye12744LT.scottworld.net has address 192.168.3.46

Test that the reverse lookup works:

host 10.3.200.1

Response:

root@solaris:/var/lib/bind/zones# host 10.3.200.1
1.200.3.10.in-addr.arpa domain name pointer solaris.
1.200.3.10.in-addr.arpa domain name pointer solaris.local.

REMEMBER Do not forget to update the serial every time you make any changes to a zone file.

To make a change to DNS.

rndc freeze <zone you want to freeze>
nano /var/lib/bind/zones/<file you want to change>
Make sure you update the serial number
rndc thaw <zone you want to unfreeze>


Save and close the editor when you are finished. Reload the systemd daemon to read the new configuration into the running system:

sudo systemctl daemon-reload
sudo systemctl restart bind9