Are we clear that this is a dnsmasq problem, and not a systemd-resolved one? Can you add --log-queries to the dnsmasq configuration and see what dnsmasq is doing? That should demonstrate if the loop is dnsmasq forwarding to itself, of if the problem is something else.
Cheers, Simon. On 13/03/17 08:46, Paul wrote: > 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.......)........ > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1672099 Title: DNS loop, >5,000 queries per second for minutes at a time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1672099/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
