[Dnsmasq-discuss] "--all-servers" always on?

Simon Rettberg simon.rettberg at rz.uni-freiburg.de
Tue Dec 10 16:12:39 GMT 2019


Am Mon, 9 Dec 2019 11:58:22 -0500
schrieb John Siu <john.sd.siu at gmail.com>:

dnsmasq sends queries to all servers occasionally to determine which
one replies fastest, and then keeps using that one exclusively for a
while. Do you see every single query sent to all servers, or just the
first one after restarting dnsmasq?

- Simon

> OS: Ubuntu 18.04 with all updates
> dnsmasq version: 2.79-1
> 
> According to man page:
> 
> --all-servers
>     By default, when dnsmasq has more than one upstream server
> available, it will send queries to just one server. Setting this flag
> forces dnsmasq to send all queries to all available servers. The
> reply  from  the  server which  answers first will be returned to the
> original requester.
> 
> I don't have that flag in command line or in the config file. However
> with "log-queries=extra" in config file, I am seeing following:
> 
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 query[A]
> news.com from 10.10.10.101
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 2001:1998:f00:2::1
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 2001:1998:f00:1::1
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 2606:4700:4700::1001
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 2606:4700:4700::1111
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 2001:4860:4860::8844
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 2001:4860:4860::8888
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 209.18.47.63
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 209.18.47.62
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 209.18.47.61
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 1.0.0.1
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 1.1.1.1
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 8.8.4.4
> Dec 09 11:29:24 door dnsmasq[9403]: 3640 10.10.10.101/49351 forwarded
> news.com to 8.8.8.8
> Dec 09 11:29:25 door dnsmasq[9403]: 3640 10.10.10.101/49351 reply
> news.com is 35.190.79.82
> 
> Is --all-servers behavior changed to default on? Is there a way to
> revert it?
> 
> Thank you!
> 
> John Siu




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