[Dnsmasq-discuss] When multiple CNAMEs are mapped to same domain, then some of the CNAME entries becomes outdated.
Atul Gupta
atul14.kumar at gmail.com
Wed Sep 12 04:28:29 BST 2012
I am seeing the following issues with the DNSMASQ:
When multiple CNAMEs are mapped to a single domain then the code seems to
update the domain in the cache multiple times causing the UID to be
updated. When the CNAMEs are requested next time although they are in the
cache, it is marked as outdated (because of the UID mismatch) triggering
the DNSMASQ to forward the query back up to the server.
For example:
Host Address
Flags Expires
india.blogs.nytimes.com
CF Fri Sep 14 13:25:24 2012
cityroom.blogs.nytimes.com
CF Fri Sep 14 13:25:17 2012
mediadecoder.blogs.nytimes.com
CF Fri Sep 14 13:25:23 2012
afterdeadline.blogs.nytimes.com
CF Fri Sep 14 13:25:18 2012
opinionator.blogs.nytimes.com
CF Fri Sep 14 13:25:18 2012
well.blogs.nytimes.com
CF Fri Sep 14 13:25:22 2012
publiceditor.blogs.nytimes.com
CF Fri Sep 14 13:25:18 2012
dealbook.nytimes.com dealbook.blogs.nytimes.com
CF Fri Sep 14 13:25:10 2012
takingnote.blogs.nytimes.com blog.nytimes.com
CF Fri Sep 14 13:25:24 2012
rendezvous.blogs.nytimes.com
CF Fri Sep 14 13:25:24 2012
tmagazine.blogs.nytimes.com
CF Fri Sep 14 13:25:24 2012
campaignstops.blogs.nytimes.com
CF Fri Sep 14 13:25:18 2012
dealbook.blogs.nytimes.com blog.nytimes.com
CF Fri Sep 14 13:25:10 2012
runway.blogs.nytimes.com
CF Fri Sep 14 13:25:23 2012
lens.blogs.nytimes.com
CF Fri Sep 14 13:25:11 2012
artsbeat.blogs.nytimes.com
CF Fri Sep 14 13:25:23 2012
krugman.blogs.nytimes.com
CF Fri Sep 14 13:25:24 2012
blog.nytimes.com 170.149.168.153
4F Fri Sep 14 13:25:24 2012
blog.nytimes.com
6F N Fri Sep 14 13:25:10 2012
In this example when on receiving any one of the CNAME domains query from
the client PC, the DNSMASQ resends the query to the server because the
entry in the cache is deemed as outdated. I fixed the issue by checking the
cache before the "cache_insert" is invoked from the function
"extract_addresses".
Has anyone faced similar issue? Is the fix ok?
Atul.
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