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
This will prevent a whole bunch of IP6 fails and your log filling up.
nano /etc/default/named
Add / edit the following lines
# # run resolvconf? RESOLVCONF=no # startup options for the server OPTIONS="-u bind -4"
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.
include "/etc/bind/rndc.key";
zone "scottworld.net" {
type master;
file "/var/lib/bind/zones/db.scottworld.net";
check-names ignore;
allow-update { key rndc-key; };
};
zone "3.10.in-addr.arpa" {
type master;
file "/var/lib/bind/zones/db.10.3";
check-names ignore;
allow-update { key rndc-key; };
};
Create a zone folder to host the zone files in /var/lib/bind/
mkdir /var/lib/bind/zones
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.
amazon-5f60112a9 A 10.3.50.13
amazon-c01e642c8 A 10.3.50.12
asteriod A 10.3.101.2
BackCam A 10.3.50.31
Chromecast A 10.3.50.14
comet A 10.3.200.3
cyd A 10.3.50.24
ddhomerun A 10.3.50.1
Dining-main A 10.3.50.5
Dining-uplighter1 A 10.3.50.17
Dining-uplighter2 A 10.3.50.18
DoorBell A 10.3.50.32
envoy A 10.3.50.2
FrontCam A 10.3.50.30
gateway A 10.3.1.1
HotWaterRelay A 10.3.50.33
ipPhone A 10.3.50.40
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
mimas A 10.3.101.3
MiniR2 A 10.3.50.23
mqtt CNAME mars
patio A 10.3.50.6
porch A 10.3.50.7
PowerCord A 10.3.50.19
printer A 10.3.101.100
roku A 10.3.50.9
saturn A 10.3.101.1
scottcloud CNAME solaris
scotthome CNAME solaris
scottscreen A 10.3.50.3
solaris A 10.3.200.1
WAPLoft A 10.3.1.2
WAPLounge A 10.3.1.3
wiki CNAME scottworrs.cluster020.hosting.ovh.net.
wikimin CNAME solaris
www CNAME scottworrs.cluster020.hosting.ovh.net.
yamaha A 10.3.50.8
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. (
1 ; serial
604800 ; refresh (1 week)
86400 ; retry (1 day)
2419200 ; expire (4 weeks)
604800 ; minimum (1 week)
)
NS solaris.scottworld.net.
$ORIGIN 1.3.10.in-addr.arpa.
1 PTR gateway.scottworld.net.
2 PTR WAPLoft.scottworld.net.
3 PTR WAPLounge.scottworld.net.
$ORIGIN 50.3.10.in-addr.arpa.
1 PTR ddhomerun.scottworld.net.
10 PTR Landing-main.scottworld.net.
12 PTR amazon-c01e642c8.scottworld.net.
13 PTR amazon-5f60112a9.scottworld.net.
14 PTR Chromecast.scottworld.net.
15 PTR Lounge-larry.scottworld.net.
16 PTR Lounge-floor.scottworld.net.
17 PTR Dining-uplighter1.scottworld.net.
18 PTR Dining-uplighter2.scottworld.net.
19 PTR PowerCord1.scottworld.net.
2 PTR envoy.scottworld.net.
20 PTR mame.scottworld.net.
21 PTR Lounge-colin.scottworld.net.
23 PTR MiniR2.scottworld.net.
24 PTR cyd.scottworld.net.
3 PTR scottscreen.scottworld.net.
30 PTR FrontCam.scottworld.net.
31 PTR BackCam.scottworld.net.
32 PTR DoorBell.scottworld.net.
33 PTR HotWaterRelay.scottworld.net.
4 PTR Lounge-main.scottworld.net.
40 PTR ipPhone.scottworld.net.
5 PTR Dining-main.scottworld.net.
6 PTR patio.scottworld.net.
7 PTR porch.scottworld.net.
8 PTR yamaha.scottworld.net.
9 PTR roku.scottworld.net.
$ORIGIN 100.3.10.in-addr.arpa.
$ORIGIN 101.3.10.in-addr.arpa.
1 PTR saturn.scottworld.net.
100 PTR printer.scottworld.net.
2 PTR asteroid.scottworld.net.
3 PTR mimas.scottworld.net.
$ORIGIN 200.3.10.in-addr.arpa.
1 PTR solaris.scottworld.net.
2 PTR mars.scottworld.net.
3 PTR comet.scottworld.net.
; also list other computers
nano named.conf.options
add these lines to the options file.
allow-query-cache { localnets; 10.3.0.0/16; };
allow-recursion { localnets; 10.3.0.0/16; };
Set the permissions on the folder / zone files so BIND can write to them.
chown bind:bind /var/lib/bind/zones -R chmod 770 /var/lib/bind/zones chmod 660 /var/lib/bind/zones/*
Restart BIND
systemctl start bind9.service
Test that the dns lookups works with the local server:
dig @10.3.200.1 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 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>
nano /etc/netplan/00-solaris.yaml
Change the nameserver to yourself 10.3.200.1
netplan apply