On 7/01/2012 3:56 a.m., Amos Jeffries wrote:
On 6/01/2012 1:53 a.m., John wrote:
Basically I'm looking for a third option to "dns_v4_fallback", like
this:
"If this is Squid will lookup A and only try AAAA if none found."
John
The way the DNS is written it is serial lookups, and to reverse the
lookups you would need to rewrite the whole lookup and result merging
sequence.
We talk occasionally about making the DNS lookus asyn and using the
first response immediately, but nobody has yet had time to write that
code. Patches welcome.
You should be able to reduce dns_timeout to a few seconds safely. The
iteration is not through all remote DNS servers, but throughthe set of
your own internal ones. A small set is recommended when facing this
problem.
Amos
In a brilliant piece of timing Henrik has returned from other work with
a patch which does the DNS system re-write to solve your problem. :-)
You can find it in squid-dev under the title "[MERGE] Send DNS A and
AAAA queries in parallel".
Current version will still wait the timeout of the longest response, but
not add the lag together for a huge total.
Amos
