[Dnsmasq-discuss] CNAME not added in dns cache

[Atul Gupta]

Hi,

I have seen issue that many times a CNAME is not added in dns cache. Issue
is more visible when there is a chain of CNAMEs pointing to an ip address

e.g.

Domain name A ---> CNAME B


CNAME B---> CNAME C

CNAME C---> CNAME D

CNAME D ---> Some ip address

In above example Both C and D are added in Cache, But B is not added. So
any request for A , needs to be resolved by dnsmasq from beginning and no
advantage of cache in this case.


Looking deep into this problem, i found that while adding any entry in
cache , dnsmasq checks if  flag F_IPV4 or F_IPV6 is associated with an
entry, then only it adds it in cache otherwise it ignores this. in above
example  F_IPV4 flag is set for CNAME C and D, so they are added but not
set for B.


Has anyone else faced similar issue? Is there any harm in setting flag =
F_IPV4 | F_IPV6 for CNAME B as well.


Looking forward for a reply in this.

Regards,
Atul.

PS :- I am using latest dnsmasq package.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/attachments/20120714/4c3090d8/attachment.html>