R: Too many connections on the same IP

[Hugh Greenberg]

Have you checked to see if there is another machine using the same IP?

> On Mar 3, 2015, at 4:40 PM, Job <Job at colliniconsulting.it> wrote:
> 
> I tried to tune kernel, with SOMAXCONN but with no solutions!
> When DNS queries raise up over 300 queries per second, bind has huge timeouts and often does not respond.
> If i work on an ip alias, everything is right!
> 
> it seems bind has some limit based on local ip address.
> 
> is there any solutions?
> 
> Thank you again!
> Francesco
> 
> ________________________________________
> Da: bind-users-bounces at lists.isc.org [bind-users-bounces at lists.isc.org] per conto di Job [Job at colliniconsulting.it]
> Inviato: martedì 3 marzo 2015 11.43
> A: bind-users at lists.isc.org
> Oggetto: Too many connections on the same IP
> 
> Hello,
> 
> during a massive DNS utilization our Bind 9.10.1-P1 seems not to resolve anymore, neither local zone.
> We shutdown one of the two nodes and all queries arrived only on one node.
> 
> CPU and memory load were not too overloaded, machine was quite fine.
> 
> After some fast tests, i noticed that if from clients i used an ip alias of Bind server, it worked perfectly!
> 
> Only on main ip there were congestion problems, but resolving on ip aliases worked fastly!
> 
> Where was i wrong?
> 
> Thank you!
> Francesco
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