[Dnsmasq-discuss] DNS server order is not being honored

[Daniel Nicoletti]

Hi,
a friend of mine using NetworkManger complained
that when he puts 3 DNS entries on NM he gets
NXDOMAIN, then he goes to /etc/resolv.conf
and manually adds them. Since NM uses dnsmasq
and the website says bugs should be discussed here
I'll explain why it is failing.
Also note that I'm not a DNS expert (he knows about
it better), anyway, we found out that different from
libresolver dnsmasq spawns a call for all DNS servers
and the fist to reply gets repassed to the caller.

This is a big problem, since you put your internal
company DNS to resolv local names, then you
add some external DNS just in case the internal one fails.
It also means that the order that you put the DNS
doesn't matter since the reply speed is what is more
important...

I think it would be sane to have the same behavior
as libresolv. How can this issue be addressed?
Is there another place to fill a bug report?
My friend told be also that he saw other people
complaining in forums about this but they
didn't know the cause.

TCPDUMP (I changed the ips...)
15:05:48.978824 IP 200-200-200-200.bbone.telesp.net.br.40510 >
10.0.0.123.domain: 12632+ A? intranet.foo.bar. (40)
15:05:48.978872 IP 200-200-200-200.bbone.telesp.net.br.40510 >
resolver1.telesp.net.br.domain: 12632+ A? intranet.foo.bar. (40)
15:05:48.979517 IP 200-200-200-200.bbone.telesp.net.br.45180 >
resolver1.telesp.net.br.domain: 49029+ PTR? 123.0.0.10.in-addr.arpa. (41)
15:05:48.982797 IP resolver1.telesp.net.br.domain
> 200-200-200-200.bbone.telesp.net.br.40510: 12632 NXDomain 0/1/0 (102)
15:05:48.983391 IP resolver1.telesp.net.br.domain
> 200-200-200-200.bbone.telesp.net.br.45180: 49029 NXDomain 0/0/0 (41)
15:05:48.984412 IP 200-200-200-200.bbone.telesp.net.br.26486 >
resolver1.telesp.net.br.domain: 2556+ A? intranet.foo.bar. (40)
15:05:48.984622 IP 10.0.0.123.domain >
200-204-2-133.bbone.telesp.net.br.40510: 12632* 1/0/0 A 10.20.96.43 (56)
15:05:48.988846 IP resolver1.telesp.net.br.domain >
200-200-200-200.bbone.telesp.net.br.26486: 2556 NXDomain 0/1/0 (102)

As you can see 10.0.0.123 does knows about the domain, but
resolver1.telesp.net.br reply first.

-- 
Daniel Nicoletti

KDE Developer - http://dantti.wordpress.com
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