[outages] Google Resolver 8.8.8.8 Selectively responding to RDNS requests

[Blake McKeeby]

Great, I agree that it is because traffic from x.x.x.1 is taking a different path than x.x.x.2 likely because of a load balancing technique which has some dependency on source ip. I’ve posted the issue in Google’s issue tracker. Thanks for the help! 


On May 23, 2014, at 10:57 AM, Scott Berkman <scott at sberkman.net> wrote:

> Check out this page and the link from there to the Google Public DNS User Group or the Issue Tracker for reporting issues:
> 
> https://developers.google.com/speed/public-dns/docs/using?csw=1#troubleshooting
> 
> Hope that helps,
> 
>  -Scott
> 
> 
> 
> On 05/23/2014 03:31 AM, Blake McKeeby wrote:
>> I have a /24 in an Internap colo and use Google Resolver 8.8.8.8 on all my machines. Google will not consistently respond to RDNS lookups from source IP X.X.X.1 but will respond consistently if I change the IP address of the machine to X.X.X.2. I have proven the DNS response is never returned using tcpdump.
>> It's positively not a local networking issue as changing my resolver to 4.2.2.2 (Level 3) while the machine uses X.X.X.1, the RDNS responses arrive without fail.
>> 
>> Has anyone else seen this sort of selective response by Google? Do they maintain some sort of black list?
>> 
>> 
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