The DNS doesn't really work when different servers return different
answers to the same query.

To answer your question, have all the servers return the same answer,
which contains all four addresses for abc.123.com. Dnsmasq will cache
that answer and round-robin the addresses when queried.


Cheers,

Simon.



On 05/03/18 15:37, meenakshi sundaram wrote:
> 
> Hi All,
>    
>       I would like to know the behavior of dnsmasq in the following scenario
> 
> 
> 
> 
> PC --- Dnsmasq-as-Forwarder-------- |------ DNS-Server1 { abc.123.com
> ---- 1.1.1.1, abc.123.com ---- 1.1.1.2}
>                                                              |
>                                                              |
>                                                            
>  |--------DNS-Server-2  { abc.123.com ---- 1.1.1.3, abc.123.com ----
> 1.1.1.4}
> 
> When PC sends the query for abc.123.com, Dnsmasq forwards queries to
> both DNS-servers. Both servers sends the reply.
> PC  receives only one reply with answer from either DNS-Server1 or
> DNS-Server2.  it is expected as per design. 
> 
> 
> I was expecting the dnsmasq-forwarder  to cache the replies/answers from
> both servers( Server1's reply {abc.123.com ---- 1.1.1.1, 1.1.1.2}
> Server2's reply {abc.123.com ---- 1.1.1.3, 1.1.1.4)} .
> 
> When i checked the cache of dnsmasq-forwarder, it only caches the first
> reply from either DNS-Server1 or DNS-Server2, NOT both. 
> 
> So wondering, how to do the RoudRobin Load balancing among four
> servers(1.1.1.1/2/3/4) which serves abc.123.com. 
> 
>  i checked the code. Looks like " the after  processing first reply, the
> frec is freed, so dnsmasq can't cache the entries."
> 
> Could you explain? 
> 
> thanks
> S.Meenakshisundaram
> 
> 
> 
> 
> 
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss@lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> 


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

Reply via email to