Can Atlas probe handle Truncated response ?
Hi folks, I once setup a measurement of DNS UDP to see if the number of timeout increase due to large response. The answer is yes. But I wonder if the timeout is no answer after three times of retries or also includes TCP fallback. Is it true that the probe in DNS UDP measurement will not use TCP to retry even after it receives a truncated response. Best regards, Davey
On Tue, Sep 05, 2017 at 11:33:23AM +0800, Davey Song <ljsong@biigroup.cn> wrote a message of 102 lines which said:
I once setup a measurement of DNS UDP to see if the number of timeout increase due to large response. The answer is yes. But I wonder if the timeout is no answer after three times of retries or also includes TCP fallback.
The Atlas DNS test apparently tries only once, and, by default, does not fallback to TCP. (Source: tcpdump.) I don't think tou can ask for several tests. (Source: <https://atlas.ripe.net/docs/api/v2/reference/#!/measurements>)
On 2017/09/12 17:19 , Stephane Bortzmeyer wrote:
I don't think tou can ask for several tests. (Source: <https://atlas.ripe.net/docs/api/v2/reference/#!/measurements>)
There is a retry option hidden somewhere in the docs. "[dns] retry (integer): Number of times to retry," Philip
participants (3)
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Davey Song(宋林健) -
Philip Homburg -
Stephane Bortzmeyer