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Hi,
I've got 4 upstream DNS Servers from my ISP (2 IPv4, 2 IPv6) and use
all of them in /etc/resolv.conf.
I start sending DNS SRV querys from a client to dnsmasq DNS relay every
5 seconds.
Each request is sent to four DNS upstream servers (primary DNS v4,
secondary DNS v4, primary DNS v6, secondary DNS v6). The answer from the
fastest server is used.
As the requests are DNS SRV records, the reply is not cached by
dnsmasq.
During my tests the first IPv6 DNS server was always the fastest
replying server and for this reason the answer from this server is
passed to the client always,
After some time the dnsmasq relay is not forwarding the requests to the
four known DNS servers any more but only sends out the requests to
either the first IPv4 DNS server or the first IPv6 DNS server. So only
one server is used. After about 20 seconds (4 requests later) the
dnsmasq process falls back to the expected behaviour of sending the
request to all known DNS Servers.
does anybody knows the reason for this?
- ---
Mit freundlichen Grüßen
Daniel Steglich
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