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If there is no response to the UDP SOA queries from any server, the final attempt is to retrieve the SOA via TCP.
It's TCP connection failures that cause the server to be added to the unreachable cache - either the last attempt at an SOA query, or, if the SOA query was successful via UDP, the first attempt at a zone transfer.
The process of checking and updating is called a zone refresh: When a server is restarted, it sends out notifications for the zones that it has loaded (in case they have been updated while it was not running).
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The default is that slaves will request IXFR (unless otherwise configured) but they will always handle being given an AXFR instead, if no IXFR is available.
The critical component that controls the decision on whether or not the zone has changed is the serial number that is maintained in the zone's SOA record (although when a master reloads, it does also check the timestamp on the zone data file first, before checking the zone's SOA).
17-Nov-2011 .762 xfer-in: info: transfer of 'testzone.com/IN' from 192.0.2.1#53: connected using 192.0.2.4#4729617-Nov-2011 .762 xfer-in: error: transfer of 'testzone.com/IN' from 192.0.2.1#53: failed while receiving responses: connection reset17-Nov-2011 .762 xfer-in: info: transfer of 'testzone.com/IN' from 192.0.2.1#53: Transfer completed: 0 messages, 0 records, 0 bytes, 0.001 secs (0 bytes/sec) Above we can see that a zone transfer was started, but failed due to the TCP connection to the master server being reset.
Typically this will be due to the tcp-listen-queue not being increased in line with other tuning options.
Where servers handle large numbers of zone transfers - either because they have zones that are highly dynamic (many and frequent changes) or are simply serving a very large number of zones, then some consideration needs to be given to tuning to avoid: The last problem on the list is the one that historically has led to tuning options that 'throttle' zone transfers, but higher-speed hardware and networks developed in recent years mean that most servers should be able to handle a significant rate of zone maintenance activity in parallel with servicing client queries.
Configuration options for tuning zone transfers that are set too low may therefore cause other issues for zone administrators.
On the server providing the zone transfers you might also see some relevant messages logged from category client.
This means that a zone transfer was started but failed.
Whilst there are mechanisms in place to alert slaves that they should check to see if a zone transfer is needed, the transfer itself is always started by the slave.Tags: Adult Dating, affair dating, sex dating