View source for Install DNS in raspberry pi

==Local DNS Installation Procedure Using Raspberry Pi==

=== Requirement and Devices ===
# Devices check-list 
#* Two Raspberry Pi (server, client) + 16GB SD Card 
#* Networking devices: switch, network Cable, Router , Keyboard and Mouse. 
# Technology
#* Raspberry Pi Ubuntu Server Operating System
#**Reference: https://ubuntu.com/download/raspberry-pi
#*Raspberry Pi Imager
#**Reference: https://www.raspberrypi.org/software/
#**Putty for remote ssh to our Raspberry Pi
#**Reference: https://www.putty.org/
#System Physical Architecture
[[Image:abc.png|thump|Architecture]]
===Installation Process===
====We assume that: ====
* Both Raspberry Pi have been installed ubuntu server operating system
* Our local network has been connected to internet and local network with LAN: 192.168.0.1/24 (gateway: 192.168.0.1)
=====DNS Server:===== 
* Hostname: server.inforsec.com
* IP address: 192.168.0.2
=====DNS Client:=====
* Hostname: client.infosec.com
* IP address: 192.168.0.3
=====DNS Package Installation=====
we use bind9 package for our DNS server and dnsutils for troubleshooting tool
* sudo apt install bind9 dnsutils
=====DNS File Configuration=====
After we installed the packaged in our DNS server, we will get the configuration folder in /etc/bind/
* /etc/bind/named.conf.options: global DNS options
* /etc/bind/named.conf.local: for your zones
* /etc/bind/named.conf.default-zones: default zones such as localhost, its reverse, and the root hints
First of all we have to configure our zones so we have domain zone and IP zone (forward zone and reverse zone) 
* Sudo nano /etc/bind/named.conf.local
then we add the configuration of both zones into file 

Note:for indenting we can’t use tab button, we have to use space button

Forward zone and Reverse zone:
<div style="border : 2px solid gray "> 

zone "infosec.com" IN  {
      type master;
      file "/etc/bind/db.infosec.com";
};
//db.infosec.com it is just the name so we can put anything we want 

zone "0.168.192.in-addr.arpa" IN {
      type master;
      file "/etc/bind/db.192";
};
//the same case that db.192 it is just the name so we can but anything we want 
</div>
Secondly, we have to configure file of each zones (forward and reverse zone) 
	Forward zone: db.infosec.com
		<pre>    The configuration template have been made similar to the db.local so we can copy that file to be our file (db.infosec.com) and db.192 is the same structure too.</pre> 
* Sudo cp /etc/bind/db.local   /etc/bind/db.infosec.com
* Sudo nano /etc/bind/db.infosec.com
<div style="border : 2px solid gray ">
; BIND data file for local loopback interface
:: $TTL    604800
:: @       IN      SOA     server.infosec.com. root.server.infosec.com. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;

::@              IN       NS     server.infosec.com.

::@              IN       A       192.168.0.2

::server       IN       A       192.168.0.2

::host         IN       A       192.168.0.2

::client       IN       A       192.168.0.3

::client1      IN       A       192.168.0.3

; server and host is the name that we set for machine 192.168.0.2 (DNS Server) 

; client and client1 are the name that we set for machine 192.168.0.3

</div>

* Sudo cp /etc/bind/db.infosec.com   /etc/bind/db.192
* Sudo nano /etc/bind/db.192 

<div style="border : 2px solid gray ">

; BIND data file for local loopback interface

:: $TTL    604800

:: @       IN      SOA     server.infosec.com. root.server.infosec.com. (
                              2               ; Serial
                         604800               ; Refresh
                          86400               ; Retry
                        2419200               ; Expire
                         604800 )             ; Negative Cache TTL
;
::@           IN        NS      server.infosec.com.
::@           IN        PTR    infosec.com
::server      IN       A       192.168.0.2
::host        IN       A       192.168.0.2
::client      IN       A       192.168.0.3
::client1     IN       A       192.168.0.3
::2             IN       PTR    server.infosec.com
::3             IN       PTR    client.infosec.com
</div>

Thirdly, we have to configure our network address and resolv.conf file

To configure the network interface as we use version 20.0 so it is configured by netplan. 
* Sudo nano /etc/netplan/file_name 

File_name it is already created so we can go to that location we will get it. The apply this configuration

<div style="border : 2px solid gray ">
<pre>
network:
    ethernets:
        eth0:
            dhcp4: no
            addresses: [192.168.0.2/24]
            gateway4: 192.168.0.1
            nameservers:
                   search: [infosec.com]
                   addresses: [192.168.0.2]

</pre>
</div>

Then we have to write this command to apply the configuration
* Sudo netplan apply 
Finally, we have to configure resolv.conf
* Sudo nano /etc/resolv.conf

<div style="border : 2px solid gray ">
Nameserver 192.168.0.2
Search  infosec.com 
</div>
For client side we use configure network address like the interface above but with different IP address and set resolv.conf the same as DNS server. 

=== Testing ===
<pre>
To test if our configuration is correct or not, we can use ping and nslookup.
-	If you use ping it will respond, even you use IP or name of server. 	
    PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data.
    64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.104 ms
    64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.093 ms
    64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.069 ms
-	Using ping with name
    PING server.reatrey.com (192.168.0.2) 56(84) bytes of data.
    64 bytes from server.reatrey.com (192.168.0.2): icmp_seq=1 ttl=64 time=0.060 ms
    64 bytes from server.reatrey.com (192.168.0.2): icmp_seq=2 ttl=64 time=0.083 ms
    64 bytes from server.reatrey.com (192.168.0.2): icmp_seq=3 ttl=64 time=0.070 ms

</pre>
<h1 > Hope You Can Make It Works As I did </h1>