[atlas] 答复: Many timeout-failures for DNS over TCP

Thanks for the information. It seems to me that the comparison on failures between TCP and UDP make no sense at this moment. 

 

Davey

发件人: ripe-atlas [mailto:ripe-atlas-bounces at ripe.net] 代表 Tom
发送时间: 2017年5月9日 16:33
收件人: ripe-atlas at ripe.net
主题: Re: [atlas] Many timeout-failures for DNS over TCP

 

For reference, it still appears on https://atlas.ripe.net/ for me -



Tom

May 9, 2017 9:14 AM, w.b.devries at utwente.nl wrote:

Hi Davey,

There used to be a message on the atlas.ripe.net frontpage, I retrieved it from google cache:

Due to an unfortunate bug in a recent probe firmware (version 4760), TCP based DNS measurements are not providing correct results. This affects all ongoing and one-off measurements.

The issue also affected DNSMON measurements between 14-23 March. On 23 March we deployed a corrected firmware on RIPE Atlas anchors (version 4770), and in the near future we'll deploy it on regular probes as well.

Our excuses for the inconvenience caused!​

So any probe that is still on version 4760 will provide timeouts for TCP DNS lookups.

Cheers,

Wouter

  _____  

From: ripe-atlas <ripe-atlas-bounces at ripe.net> on behalf of Davey Song($BAWNS7r(B) <ljsong at biigroup.cn>
Sent: Tuesday, May 9, 2017 10:03 AM
To: ripe-atlas at ripe.net
Subject: [atlas] Many timeout-failures for DNS over TCP

Hi folks, 

I setup measurements for DNS queries over both TCP and UDP. I found the timeout and failures of TCP is far more than UDP. 

For example :

DNS over TCP: https://atlas.ripe.net/measurements/8552847/#!probes

DNS over UDP: https://atlas.ripe.net/measurements/8552846/#!probes 

Is it normal ? I mean is there any special timeout routine/parameters of atlas probes from normal resolver?

Best regards,

Davey





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