[Dnsmasq-discuss] upstream server for "local domain" adresses

[Simon Kelley]

On 13/06/14 18:34, Johann Knoeferl wrote:
> -----Ursprüngliche Nachricht-----
> Von: Dnsmasq-discuss [mailto:dnsmasq-discuss-bounces at lists.thekelleys.org.uk] Im 
> Auftrag von Simon Kelley
> Gesendet: Mittwoch, 11. Juni 2014 22:06
> An: dnsmasq-discuss at lists.thekelleys.org.uk
> Betreff: Re: [Dnsmasq-discuss] upstream server for "local domain" adresses
>  > Are you using the same configuration on both sides? I suspect that you're 
> somehow creating a loop where on server send the query to the other, which sends 
> it back to the first, which sends it again to the second, and so on.
>  >
>  > The first thing to do is to set
>  >
>  > log-queries
>  >
>  > and look at the log files to see what's happening.
>  >
>  > Cheers,
>  >
>  > Simon.
>  >
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> Hello Simon,
> You are right. Somehow I created a loop with my configuration:
> Router 1:
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: forwarded 
> machine02.mydomain.lan to 192.168.10.1
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: query[AAAA] 
> machine02.mydomain.lan from 192.168.7.13
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: forwarded 
> machine02.mydomain.lan to 192.168.10.1
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: query[AAAA] 
> machine02.mydomain.lan from 192.168.7.13
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: forwarded 
> machine02.mydomain.lan to 192.168.10.1
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: query[AAAA] 
> machine02.mydomain.lan from 192.168.7.13
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: forwarded 
> machine02.mydomain.lan to 192.168.10.1
> Jun 13 18:01:16 router01 daemon.info dnsmasq[4184]: query[AAAA] 
> machine02.mydomain.lan from 192.168.7.13
> ...
> Router 2:
> Jun 13 18:02:06 router02 daemon.info dnsmasq[12730]: query[A] 
> router02.mydomain.lan from 192.168.10.11
> Jun 13 18:02:06 router02 daemon.info dnsmasq[12730]: /etc/hosts 
> router02.mydomain.lan is 192.168.10.1
> Jun 13 18:02:06 router02 daemon.info dnsmasq[12730]: query[AAAA] 
> machine02.mydomain.lan from 192.168.6.1
> Jun 13 18:02:06 router02 daemon.info dnsmasq[12730]: forwarded 
> machine02.mydomain.lan to 192.168.6.1
> Jun 13 18:02:06 router02 daemon.info dnsmasq[12730]: query[AAAA] 
> machine02.mydomain.lan from 192.168.6.1
> Jun 13 18:02:06 router02 daemon.info dnsmasq[12730]: forwarded 
> machine02.mydomain.lan to 192.168.6.1
> Jun 13 18:02:06 router02 daemon.info dnsmasq[12730]: query[AAAA] 
> machine02.mydomain.lan from 192.168.6.1
> ...
> In this example I asked for a DNS entry which can be found in router01 hosts file.
> Nevertheless the query goes back to router02 which can't handle it and so 
> router01 is aked again.
> Both router are configuried equal - except for the ip of each other.
> My thought was that the priority is hasts file and only if an entry can not be 
> found a server entry is used.
> But it seems that the server has higer priority. Is there a way to change this?
> But  the more I think about it, it seems not to be clever at all, what I have done.
> If someone asks for a dns entry which isn't listed in the hosts file, i will run 
> in the same problem even when I can achive to change the priority.
> What would be the best way for servering two subnets with the same local dns 
> entries?
> Using complete hosts file on both sides?
> Using only one host file as master and to query it from both sides?
> Thanks for any suggestions!
> 
> 

The query which is looping is for the IPv6 address. I guess you don't
have IPv6 addresses in the hosts file.

Adding something like

address=/mydomain.lan/::1

will stop the looping, but might mess things up because all IPv6 queries
will get a ::1 answer (== 127.0.0.1) in IPv4-land)


Cheers,

Simon.

> 
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