[dns-operations] TC=1 and stub resolvers, firefox appears to not do it

Jelte Jansen jelte.jansen at sidn.nl
Wed Sep 2 14:49:02 UTC 2015

On 09/02/2015 03:45 PM, bert hubert wrote:
> On Wed, Aug 26, 2015 at 02:48:12PM +0200, bert hubert wrote:
>> Last time I checked they all supported this. But do recall the "stub
>> resolver" often is proxied via a high quality piece of routing equipment at
>> home these days...
> Ok, so it may turn out I am wrong. We just got this report from a user that
> for reasons on their own is replying TC=1 to *everything* over UDP:
> http://mailman.powerdns.com/pipermail/dnsdist/2015-September/000020.html
> "Yes! It works. When we try with the Chrome Browser it responds with  
> the TC-bit set and then it automatically retries TCP(looks great) .  
> However, when we try with Firefox Browser, it only returns the  
> response and not try with TCP.

Hmm. I have been running a cleaned up version of my tc-all-udp resolver
at my home network since last week, and have yet to run into any
noticeable problems; Firefox (38) seems to work fine.


More information about the dns-operations mailing list