On Sun, Sep 5, 2021 at 4:02 AM Dominik DL6ER <dl...@dl6er.de> wrote:
> Hey Masanari, > > On Fri, 2021-09-03 at 19:26 +0900, Masanari Iida wrote: > > dnsmasq-2.85 (Fedora 33, x86_64) > > multiple upstream DNS servers in config file. > > No --strict-order, No --all-server setting . > > > > Symptom > > Explanation about --all-servers in dnsmasq(8) man page could > > be different from actual dnsmasq behavior. > > > > In man page, it is written that > > "By default, when dnsmasq has more than one upstream server > > available, it will send queries to just one server" > > > > But actual behavior is, it sends queries to _ALL_ upstream DNS > > servers in config at once. > > And if I set --strict-order in dnsmasq.conf, then it send a query to > > one > > server at a time. > > This is expected behavior, the man page explains this somewhat hidden > in the option --strict-order: > > > By default, dnsmasq will send queries to any of the upstream servers > it knows about and tries to favour servers that are known to be up. > > This probing of the fastest happens every now and then, to be precise > every 50 queries or every 20 seconds, see > > https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob;f=src/config.h;h=30e23d8e8fb6a0b78d479f77ea021fe126e0670c;hb=HEAD#l27 > and the line below. The default probing could likely be made less > often, but else than that, I don't think there is an inconsistency > here. > > Best, > Dominik > > Hello Dominik, Thanks for the hint. I have confirmed that what I was seeing is sending queries to upstream DNS servers every 20 seconds, in case I did not specify strict-order and all-server. Regards, Masanari Iida
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