Forwarding and binding editions
Ensure that if your server forwarding and binding editions IPv6-capable, that it is properly configured. Having the roots deleted from cache, but not needing to prime them again soon forwarding and binding editions be an indication that they are seldom needed - very likely because when handling new client queries, named already has in cache a list of the servers authoritative for the TLD within which the domain name being queried falls. Why do I sometimes see the root priming queries being sent after a client query has been sent to one of the hint root servers? Do I need to configure a root hints zone myself?
In this latter case, the answer will not be authoritative and named will need to try again only to fail again, etcetera. What happens is that named will re-prime the root server list as and when needed. This means that by declaring a null forwarders list, all queries for names in and below zone not-forwarded-example. Thus the root hint zone is assumed to be mostly accurate, but they are not treated as the authoritative list of the roots.
As long as at least one of the servers listed in the root hint zone is still correct, named will be able to prime itself. If it's possible that different answers are obtained via the two different resolution methods iteration versus forwardingand that both are likely to be used in different circumstances to populate the same cache, then we strongly recommend that you do not implement this type of configuration. This is because in order to resolve the names that are in the delegated zone, the recursive server has to send forwarding and binding editions to the servers that have had the zone forwarding and binding editions to them. Since it does not yet have a primed set of roots, it will send the client query to one of the root hint servers.
When you have global forwarding configured, this is telling named that for any queries received, that it should not attempt any iterative resolution itself, but instead should forward to the specified list of servers any queries where: When handling a client forwarding and binding editions for which it has no forwarding and binding editions, a recursive server needs to know which authoritative server is responsible for the domain of the name it has been asked to resolve. This is iteration - and this is why the global forwarders directive becomes applicable. In the case of with-delegation-example.
Root priming is done for the first time, only when named needs to send a query to one of the root nameservers. For a view that has forwarding and binding editions disabled, the default is " empty-zones-enable no;". If your nameserver receives a query for a name in the delegated domain, what should it do? Forwarding and binding editions upward referral is one in which a server that is unable to answer a query, usually because of an out-of-date delegation, responds with a referral to the root nameservers. There is no feedback for this article.
Hi Greg, thank you for your feedback. Forwarding and binding editions will try to submit a bug report on this, but wanted to point out I was grateful to find this new configuration option. This in theory could cause re-priming at a frequency of up to once per forwarding and binding editions, but with a 'warm' cache would be significantly less. Having the roots deleted from cache and having to re-prime them very frequently and soon afterwards suggests that the configured cache size is too small for the rate and breadth of the query load that the server is handling and you should consider increasing your provisioning. Feedback There is no feedback for this article.
What happens is that named will re-prime the root server list as and when needed. There is no feedback for this article. If this lack of connectivity is coupled with a failure of the socket forwarding and binding editions to pass send failures back to the named application, then any attempts to send queries to IPv6 destinations will instead time out.