Dnsmasq : Install2021/08/18

	Install Dnsmasq which is the lightweight DNS forwarder and DHCP Server Software.
[1]	Install Dnsmasq.

root@dlp:~#

apt -y install dnsmasq

[2]	Configure Dnsmasq.

root@dlp:~#

vi /etc/dnsmasq.conf

# line 19 : uncomment

# never forward plain names

domain-needed

# line 21 : uncomment

# never forward addresses in the non-routed address spaces

bogus-priv

# line 53 : uncomment

# query with each server strictly in the order in resolv.conf

strict-order

# line 67 : add if you need

# query the specific domain name to the specific DNS server

# the example follows means query [server.education] domain to the [10.0.0.10] server

server=/server.education/10.0.0.10

# line 135 : uncomment

# add domain name automatically

expand-hosts

# line 145 : add : define domain name

domain=srv.world

root@dlp:~#

systemctl restart dnsmasq

[3]	For DNS records, add them in [/etc/hosts]. Then, Dnsmasq will answer to queries from clients.

root@dlp:~#

vi /etc/hosts

# add records
10.0.0.30       dlp.srv.world dlp

[4]	Verify to resolve Name or IP address from a client that is in your internal network.

root@desktop:~#

vi /etc/resolv.conf

# change DNS setting to Dnsmasq Server

nameserver 10.0.0.30

root@desktop:~#

dig dlp.srv.world.


; <<>> DiG 9.16.15-Debian <<>> dlp.srv.world.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65393
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;dlp.srv.world.                 IN      A

;; ANSWER SECTION:
dlp.srv.world.          0       IN      A       10.0.0.30

;; Query time: 0 msec
;; SERVER: 10.0.0.30#53(10.0.0.30)
;; WHEN: Tue Aug 17 16:27:11 JST 2021
;; MSG SIZE  rcvd: 58

root@desktop:~#

dig -x 10.0.0.30


; <<>> DiG 9.16.15-Debian <<>> -x 10.0.0.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12506
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;30.0.0.10.in-addr.arpa.                IN      PTR

;; ANSWER SECTION:
30.0.0.10.in-addr.arpa. 0       IN      PTR     dlp.srv.world.

;; Query time: 0 msec
;; SERVER: 10.0.0.30#53(10.0.0.30)
;; WHEN: Tue Aug 17 16:27:57 JST 2021
;; MSG SIZE  rcvd: 78

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