How to minimize the unwanted traffic?

[Tom Schmitt]

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? 

Thanks,
Tom.

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