Debian 9 Stretch
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Dnsmasq : Install
2017/07/06
 
Install Dnsmasq which is the lightweight DNS forwarder and DHCP Server Software.
[1] Install Dnsmasq.
root@dlp:~#
apt -y install dnsmasq resolvconf
[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.
By the way, when Dnsmasq is running, fixed value "127.0.0.1" is added in /etc/resolv.conf and also the value of "dns-nameservers" in /etc/network/interfaces is added and managed in /var/run/dnsmasq/resolv.conf.
root@dlp:~#
vi /etc/hosts 
# add records
10.0.0.30       dlp.srv.world dlp
root@dlp:~#
systemctl restart dnsmasq

[4] Verify to resolve Name or IP address from a client in internal network.
root@desktop:~#
vi /etc/network/interfaces
# change DNS setting to Dnsmasq Server

dns-nameservers
10.0.0.30
root@desktop:~#
systemctl restart ifup@ens3 resolvconf
root@desktop:~#
dig dlp.srv.world. 


; <<>> DiG 9.10.3-P4-Debian <<>> dlp.srv.world.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23139
;; 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: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Jul 07 16:38:52 JST 2017
;; MSG SIZE  rcvd: 58
root@desktop:~#
dig -x 10.0.0.30 


; <<>> DiG 9.10.3-P4-Debian <<>> -x 10.0.0.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2333
;; 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: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Jul 07 16:39:26 JST 2017
;; MSG SIZE  rcvd: 78
 
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