R: Too many connections on the same IP

Job Job at colliniconsulting.it
Tue Mar 3 23:40:56 UTC 2015

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!

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


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!
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