[Dnsmasq-discuss] --all-servers option

[David Krupička]

Dear all,

I am using version
Name        : dnsmasq
Arch        : x86_64
Version     : 2.48
Release     : 18.el6_9

I have configured this (domains and IP's are fake)
# Add other name servers here, with domain specs if they are for
# non-public domains.
#server=/localnet/192.168.0.1
all-servers
server=/domain1.internal/172.20.11.10    # THIS server does not exist,
simulating like it was down
server=/domain1.internal/172.20.11.11
server=/domain2.internal/172.21.11.12
server=/domain2.internal/172.21.11.13

Regardless of running as a daemon or not, the all-servers option does not
work as I would expect.
Reading of /etc/resolv.conf is disabled,strict-order too. I need multiple
servers per domain.

Was this ever dealt with in higher versions? Could it be a bug or it simply
does not work like this?
There is 5 seconds delay, see below... Can I somehow reduce it? Or what
should I do?

Example:
root at hostx:~# date && nslookup server1.domain1.internal && date
Wed May 27 10:22:05 CEST 2020
Server:         127.0.0.1
Address:        127.0.0.1#53

Name:   server1.domain1.internal
Address: 172.21.100.33

Wed May 27 10:22:10 CEST 2020

Log:
dnsmasq: query[A] server1.domain1.internal from 127.0.0.1
dnsmasq: forwarded server1.domain1.internal to 172.20.11.10
dnsmasq: query[A] server1.domain1.internal from 127.0.0.1
dnsmasq: forwarded server1.domain1.internal to 172.20.11.11
dnsmasq: forwarded server1.domain1.internal to 172.20.11.10
dnsmasq: reply server1.domain1.internal is 172.21.100.33

root at iumdbtestflo01:~# tcpdump -ni any port 53
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 65535
bytes
10:30:55.813271 IP 127.0.0.1.9772 > 127.0.0.1.domain: 61442+ A?
server1.domain1.internal. (61)
10:30:55.819510 IP 172.17.211.6.sun-sr-https > 172.20.11.10.domain: 36519+
A?  server1.domain1.internal.   (61)
10:31:00.808765 IP 127.0.0.1.9772 > 127.0.0.1.domain: 61442+ A?
server1.domain1.internal.   (61)
10:31:00.808961 IP 172.17.211.6.sun-sr-https > 172.20.11.11.domain: 36519+
A?  server1.domain1.internal.   (61)
10:31:00.809006 IP 172.17.211.6.sun-sr-https > 172.20.11.10.domain: 36519+
A?  server1.domain1.internal.   (61)
10:31:00.811297 IP 172.20.11.11.domain > 172.17.211.6.sun-sr-https: 36519*
1/1/1 A 172.21.100.33 (112)
10:31:00.811412 IP 127.0.0.1.domain > 127.0.0.1.9772: 61442* 1/1/1 A
172.21.100.33 (112)

Best regards
David
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