name caching and forwarding
Phil Mayers
p.mayers at imperial.ac.uk
Tue Feb 26 16:14:26 UTC 2013
On 26/02/13 16:07, Robert Moskowitz wrote:
> And I am having challenges with the forward option. It reads that
> 'forward only' will always ask the forwarder about the query and seems
> to defeat caching? And 'forward first' only looks in cache after a
> forward fails? This does not sound right and I am missing something in
> the documentation; like forwarding ONLY applies IF the query is NOT in
> cache?
No, you've misunderstood.
"forward first" means "try the forwarders, and if you don't get a reply,
try the query yourself starting from the root"
"forward only" means "only ever try the forwarders"
"forward" replies are always cached for the relevant TTL.
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