Dnsmasq: Forward DNS queries to a particular DNS server

[stephdl]

For some specific reasons (testing, specific configuration....) we could specify a custom DNS server for a domain name

Proposed solution

For example I would like to direct all queries for domain.org to an IP, lets say 192.168.1.1, but I would like to have a specific sub.domain redirected to the relevant DNS server of the domain name.

so

domain.org forwarded to 192.168.1.1
sub.domain.org forwarded to the real DNS Server

---

thank @gsanchietti

[nethbot]

in 7.7.1908/testing:

• nethserver-dnsmasq-1.7.0-1.4.g8398ee2.ns7.noarch.rpm x86_64 armhfp aarch64

[stephdl]

QA

use dnsmasq to redirect dns queries to another dns server

config setprop dnsmasq DomainRedirection domain.org:1.1.1.1,sub.domain.org:#
signal-event nethserver-dnsmasq-save

all queries for domain.org must be sent to 1.1.1.1, the queries for sub.domain.org must be sent to the default DNS server

check in /var/log/messages:

Mar  9 18:05:42 prometheus dnsmasq[28074]: using standard nameservers for domain sub.domain.org
Mar  9 18:05:42 prometheus dnsmasq[28074]: using nameserver 1.1.1.1#53 for domain domain.org

[filippocarletti]

config setprop dnsmasq DomainRedirection nethesis.it:1.1.1.1,www.nethesis.it:#
[root@ns7 ~]# grep ^server /etc/dnsmasq.conf 
server=192.168.122.1
server=/nethesis.it/1.1.1.1
server=/www.nethesis.it/#
[root@ns7 ~]# ping nethesis.it
12:06:19.196044 IP 192.168.122.226.12623 > 1.1.1.1.53: 49116+ A? nethesis.it. (29)
12:06:19.214864 IP 1.1.1.1.53 > 192.168.122.226.12623: 49116 1/0/0 A 185.197.130.82 (56)
[root@ns7 ~]# ping my.nethesis.it
12:06:28.473216 IP 192.168.122.226.44776 > 1.1.1.1.53: 36008+ A? my.nethesis.it. (32)
12:06:28.494647 IP 1.1.1.1.53 > 192.168.122.226.44776: 36008 1/0/0 A 188.166.58.97 (62)
[root@ns7 ~]# ping -c 1 www.nethesis.it
12:10:51.566988 IP 192.168.122.226.39999 > 192.168.122.1.53: 12414+ A? www.nethesis.it. (33)
12:10:51.592014 IP 192.168.122.1.53 > 192.168.122.226.39999: 12414 1/0/0 A 185.197.130.82 (49)
[root@ns7 ~]# ping -c 1 google.it
12:06:53.712089 IP 192.168.122.226.60295 > 192.168.122.1.53: 8880+ A? google.it. (27)
12:06:53.742167 IP 192.168.122.1.53 > 192.168.122.226.60295: 8880 1/0/0 A 216.58.198.3 (43)

[nethbot]

in 7.7.1908/updates:

• nethserver-dnsmasq-1.7.1-1.ns7.noarch.rpm x86_64 armhfp aarch64

[stephdl]

@filippocarletti just my personal culture where did you find the log trace

[root@ns7 ~]# ping -c 1 google.it
12:06:53.712089 IP 192.168.122.226.60295 > 192.168.122.1.53: 8880+ A? google.it. (27)
12:06:53.742167 IP 192.168.122.1.53 > 192.168.122.226.60295: 8880 1/0/0 A 216.58.198.3 (43)