On Mon, Sep 19, 2016 at 04:40:17PM +0100, Tony Finch wrote: > /dev/rob0 <r...@gmx.co.uk> wrote: > > > > If you're thinking that you can do this replication to improve DNS > > performance, you're right, it will do that. But it certainly will > > not scale (if it's even possible to get axfr/ixfr), and it won't > > handle modern CDN systems properly. > > BIND 9.10 and later will keep popular domains in the cache by prefetching > them if they are looked up shortly before they will expire. So trying to > keep local copies of popular zones is less helpful than it used to be. > > (Unfortunately the prefetch option isn't mentioned in the HISTORY file so > I had to dig through the CHANGES to remind myself when it was introduced!)
There's an attempt to make it go one step further by refreshing whole zones in the cache: https://github.com/muks/dnsrefresh It needs another section to be completed before upload, possibly in time for IETF-97. Mukund
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