root hints operation
rob0 at gmx.co.uk
Tue Nov 17 01:56:08 UTC 2015
On Mon, Nov 16, 2015 at 06:37:36PM -0700, Grant Taylor wrote:
> In light of the upcoming H-root server changing addresses I wanted
> to confirm how BIND uses root hints.
> It's my understanding that BIND has a compiled in version of the
> root hints -and- a root hints file that can easily be updated.
You either specify a hints file to use, or use the compiled-in root
> This information is used to prime named as it starts up in such as
> it takes an IP for one of the root servers and attempts a to query
> to update the root hint server name to IP mappings. I believe that
> named will cycle through all of the IPs in the root hints file
> until it finds a server that it can query and update all of the
> root server names / IPs in memory. From and then continues running
> with that updated information.
> As such, I think BIND will continue operating with little, if any,
> ill effect if people don't update their root hints file
> immediately. (Though ideally people should update.)
Since the beginning of DNS, there has not been enough change to root
hints so as to cause operational problems.
> Will someone take a moment and confirm, or correct, my
> understanding of how root hints work in BIND?
I think this should answer your questions:
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