[dns-operations] IPv6 Connectivity on Firefox

[Mathieu Goessens]

Hi,

Le 2015-11-25 11:06, Fatemah Alharbi a écrit :
> Hello,
>
> I am a PhD student at UC Riverside, CA, USA. I am conducting
> experiments using Firefox to test Ipv6 connectivity and I would
> appreciate your cooperation and help to answer the following
> questions.
>
> EXPERIMENT 1:
>
> By default, Firefox has Ipv6 enabled. When I visit a particular
> website, Firefox always sends 2 DNS queries: A query(For IPv4 
> address)
> and AAAA query (for IPv6 address). It always prefers the IPv4 
> address,
> why?
>
> EXPERIMENT 2:
>
> Please see the attached file: block_A_record_google.pcapng. I blocked
> the IPv4 response packets (for the A queries) of the domain name
> clients1.google.com to see how Firefox would behave if it gets only
> the AAAA response. Even if Firefox gets a positive response for the
> AAAA query, it ignores the response and keeps asking for the Ipv4
> address! Why?
>
> Does that have anything to do with my ISP Ipv6 connectivity? My ISP,
> Charter, doesn’t support Ipv6 connectivity to residential customers
> yet. If so, how Firefox does know that my ISP doesn’t support Ipv6
> connectivity? How does Firefox know that the host triggering the DNS
> requests is not within an Ipv6 network?
>
> This is the result of the Ipv6 connectivity test on Firefox (Please
> see the attached file: Test Your Ipv6 Connectivity-Firefox.pdf):
>
> Thank you for your time. I look forward to hearing from you soon.

As mentionned by Shane, better to ask directly the firefox network
team:

https://lists.mozilla.org/listinfo/dev-tech-network
irc://#necko@irc.mozilla.org

Also, better to specify  what's your test environnement (ffx version,
OS as it is likely to be OS specific etc)

-- 
Mathieu Goessens
IT consultant.
gebura at poolp.org
+ 33 6 07 91 54 87
http://gebura.eu.org