[Bug 1752411] Re: bind9-host, avahi-daemon-check-dns.sh hang forever causes network connections to get stuck

[Andreas Hasenack]

Some troubleshooting I did with Trent today showed:

a) the "host -t soa local." call triggered a query to 127.0.0.53 as
expected, network-wise, which got a response right away

b) we snapshotted ip route and ip addr just before the host call, and
saw that the interface responsible for the default route (and route to
his dns server) was still down. I wonder if dns_reachable() in
/usr/lib/avahi/avahi-daemon-check-dns.sh is doing the right thing. It
looks for 127.0.0.1 (and not 127.0.0.53), and, failing that, for a
default route. The default route exists, but the link it goes through is
still down:

2: eno1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel
state DOWN group default qlen 1000

default via x.x.x.x dev eno1 onlink linkdown

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https://bugs.launchpad.net/bugs/1752411

Title:
  bind9-host, avahi-daemon-check-dns.sh hang forever causes network
  connections to get stuck

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