How to minimize the unwanted traffic?

Tom Schmitt TomSchmitt at gmx.de
Fri Apr 8 08:35:58 UTC 2005


> Hi,
> 
> I'm going to upgrade from Bind 9.2.3 to 9.3.1 and bcause of that I'm now
> testing the 9.3.1 with one primary and three secondary Server.
> 
> In the logfile of the primary I found messages like:
> 08-Apr-2005 09:01:32.704 client 10.100.100.100#65011: query:
> 66.10.in-addr.arpa IN SOA -SE
> First a question for better understanding: What does the -SE at the end of
> the line mean? SEcondary? (the 10.100.100.100 is one of my secondaries)
> 
> In our Intranet we have many zones (more than thousend), so I get very
> much
> of these messages, where one of the secondaries ask if the SOA of a zone
> has
> changed.
> But because we use dynamic DNS where the secondaries are informed of every
> change, these queries are in fact not needed and produced unwanted
> traffic.
> 
> So I thought, I could minimize this unwanted traffic if I increase the
> expire-time of every zone. But it did not work. Even with a expire-time of
> 100 days for every zone I keep getting these SOA -SE queries from my
> secondaries.
> 
> So my question is:
> What can I do to minimize this traffic? After what time the secondaries
> make
> this (not needed) query? 
> 


Hi,

I think I have found the answer to my question myself: I should increase the
refresh-time instead of the expire-time.

But something is still worry me: Each SOA-query does not come alone, every
time it comes six times:


08-Apr-2005 10:05:40.563 client 10.100.100.100#58310: query:
17.10.in-addr.arpa IN SOA -SE
08-Apr-2005 10:05:41.073 client 10.100.100.100#58311: query:
17.10.in-addr.arpa IN SOA -SE
08-Apr-2005 10:05:41.078 client 10.100.100.100#58312: query:
17.10.in-addr.arpa IN SOA -SE
08-Apr-2005 10:05:42.092 client 10.100.100.100#40082: query:
17.10.in-addr.arpa IN SOA -SE
08-Apr-2005 10:05:42.098 client 10.100.100.100#40082: query:
17.10.in-addr.arpa IN SOA -SE
08-Apr-2005 10:05:42.602 client 10.100.100.100#40082: query:
17.10.in-addr.arpa IN SOA -SE

What could be the reason for this? In my understanding one query should be
enough. 

Thanks, 
Tom.

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