[squid-users] Noticeable difference in DNS Service times after upgrade

[Amos Jeffries]

On 11/06/2015 5:16 a.m., Sebastian Goicochea wrote:
> Hello everyone, I just have a quick question
> Is there any difference in how Squid 3.5 measures DNS Service Time
> compared to 2.7 branch?
> We monitor this value using SNMP and it has been nearly 0 for months,
> but after the upgrade it went up to 6ms (with 8ms peaks)
> All other Service times have varied but apparently they improved
> 
> 
> Here's the graphic: http://imgur.com/4pCK3cY


Not that I know of, but there is both more and less being done.

The "more":

* IPv6 support adds an AAAA lookup.

* CVE-2009-0801 protection for intercepted traffic requires A+AAAA
lookup in situations which may previously not done any at all.

* hosts without FQDN may now have a .local variant looked up.

The "less":

* re-sends of HTTP messages no longer perform full lookups on each
outbound connection attempt. Just one set per message now.

* .local domains no longer have any global DNS lookups. multicast-DNS is
used instead.

Amos