Bind9 (DNS) Installation
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 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
service bind9 stop
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; }; allow-recursion { scottworld-lan; }; allow-query-cache { scottworld-lan; }; zone "scottworld.net" { type master; file "/var/lib/bind/zones/db.scottworld.net"; check-names warn; allow-update { scottworld-lan; }; }; zone "3.168.192.in-addr.arpa" { type master; file "/var/lib/bind/zones/db.192.168.3"; check-names warn; 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)
solaris A 192.168.3.200 www CNAME scottworrs.cluster020.hosting.ovh.net.
$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 192.168.3.200 $ORIGIN scottworld.net. solaris A 192.168.3.200 saturn A 192.168.3.5 ceres A 192.168.3.201 www CNAME scottworrs.cluster020.hosting.ovh.net. wiki CNAME scottworrs.cluster020.hosting.ovh.net.
Configure the local reverse lookup zone
nano /var/lib/bind/zones/db.192.168.3
; BIND reverse data file for local loopback interface ; $TTL 604800 @ IN SOA solaris.scottworld.net. mark@scottworld.net.( 1 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS solaris. 200 IN PTR solaris.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 192.168.3.200
Response:
200.3.168.192.in-addr.arpa domain name pointer solaris.scottworld.net.
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