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

[richardvoigt at gmail.com]

Unless you're using the strict-order option and still seeing the order
change, this is not a bug.

*-o, --strict-order*By default, dnsmasq will send queries to any of the
upstream servers it knows about and tries to favour servers that are known
to be up. Setting this flag forces dnsmasq to try each query with each
server strictly in the order they appear in /etc/resolv.conf


On Tue, Dec 11, 2012 at 12:38 PM, Daniel Nicoletti <dantti12 at gmail.com>wrote:

> 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
>
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>
>
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