There aren't any such entries in syslog, presumably because I had
hardcoded two upstream servers (208.67.222.222 and 208.67.220.220) using
the GUI Wi-Fi settings dialog in 16.10 and they're not changing. Oddly,
I can't see that setting in the 17.04 dialog, even though "systemd-
resolve --status" correctly reports them:
Global
DNS Servers: 127.0.0.1
DNSSEC NTA: 10.in-addr.arpa
16.172.in-addr.arpa
168.192.in-addr.arpa
17.172.in-addr.arpa
18.172.in-addr.arpa
19.172.in-addr.arpa
20.172.in-addr.arpa
21.172.in-addr.arpa
22.172.in-addr.arpa
23.172.in-addr.arpa
24.172.in-addr.arpa
25.172.in-addr.arpa
26.172.in-addr.arpa
27.172.in-addr.arpa
28.172.in-addr.arpa
29.172.in-addr.arpa
30.172.in-addr.arpa
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test
Link 2 (wlp2s0)
Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: allow-downgrade
DNSSEC supported: no
DNS Servers: 208.67.222.222
208.67.220.220
DNS Domain: local
The requests against the upstream server are disturbingly fast, I'm
surprised I haven't been blacklisted yet.
19:40:12.000415 IP hostname.50776 > resolver1.opendns.com.domain: 42051+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=nB.C...........4.1.168.192.in-addr.arpa.......)........
19:40:12.000920 IP hostname.59219 > resolver1.opendns.com.domain: 14223+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=..7............4.1.168.192.in-addr.arpa.......)........
19:40:12.001411 IP hostname.51647 > resolver1.opendns.com.domain: 2501+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=.Z
............4.1.168.192.in-addr.arpa.......)........
19:40:12.001885 IP hostname.33104 > resolver1.opendns.com.domain: 30929+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=..x............4.1.168.192.in-addr.arpa.......)........
19:40:12.002412 IP hostname.47231 > resolver1.opendns.com.domain: 46563+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=j{.............4.1.168.192.in-addr.arpa.......)........
19:40:12.004238 IP hostname.57292 > resolver1.opendns.com.domain: 61082+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=
w.............4.1.168.192.in-addr.arpa.......)........
19:40:12.008187 IP hostname.49786 > resolver1.opendns.com.domain: 14681+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=.
9Y...........4.1.168.192.in-addr.arpa.......)........
19:40:12.008926 IP hostname.53171 > resolver1.opendns.com.domain: 24423+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=.._g...........4.1.168.192.in-addr.arpa.......)........
19:40:12.009629 IP hostname.37811 > resolver1.opendns.com.domain: 55231+% [1au]
PTR? 4.1.168.192.in-addr.arpa. (53)
E..Q..@[email protected].=mk.............4.1.168.192.in-addr.arpa.......)........
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https://bugs.launchpad.net/bugs/1672099
Title:
DNS loop, >5,000 queries per second for minutes at a time
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