Bind9 slave not updating Chat with bbws for free on aiibbwcams com

Sometimes this is due to the TCP connection between the master and slave being reset but it can also be due to the master being inaccessible from the slave due to routing or firewall issues.The outcome is doubly bad: Note also that when attempting a zone refresh there is a fallback from UDP to TCP on the SOA query.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.

It will also need to be able to handle the volume of concurrent TCP client connections (see tcp-clients) for zone transfers.

tcp-clients controls the maximum number of inbound TCP connections to this server.

Here we have an indication that a zone refresh attempted earlier has failed and that this information was cached.

There are several similar error messages, but when the reason for the zone refresh not taking place is that the master's IP address is already in the unreachable cache, then the text 'unreachable (cached)' is always included.

There are a number of options that can be used to control (both on masters and slaves) which servers are notified when a zone is updated and which master servers should be queried by slaves when they are refreshing as well as handling the security implications of both via ACLs and .

This article assumes that the reader is familiar with all of these and that the zone transfer mechanism is both secure and functioning as expected, but needs some attention to tuning.

assumes that if the serial number remains the same, then the zone is unchanged.

Zone transfers are always initiated by the slave server (that is, they are 'requested' or 'pulled').

Some commonly-reported log messages are detailed below, along with the explanation of what is happening to cause them to be logged - but note that this is not a complete list!

Some messages are logged from category general, and others from categories xfer-in and xfer-out.

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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