I have DDWRT based WiFi router and affected the same bug.
DHCP6 as well as DNS6 in the router are disabled.
My problem was, that local DNS names provided by router stop resolved
after few minutes since reconnecting to the router WiFi or LAN, while
global domain names seems always resolved fine.
Bypassing systemd-resolve by editing manually nameservers in the
/etc/resolv.conf which is linked to the ../run/systemd/resolve/stub-
resolv.conf can fix the problem with local DNS names.
First I tried, as it was suggested in some discussions of the similar
issue, without success to set DNSSEC=no explicitly. Seems this systemd-
resolve setting is default now.
Then I tried to set DNS servers manually in the Network Manager. This didn't
help also.
Here the output when local DNS names provided by router stop resolved.
---------------8<----------------
$ systemd-resolve --status
Global
LLMNR setting: no
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
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 3 (wlp1s0)
Current Scopes: DNS
DefaultRoute setting: yes
LLMNR setting: yes
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
Current DNS Server: fe80::22cf:30ff:fece:c98
DNS Servers: 172.20.1.250
172.20.1.1
8.8.8.8
fe80::22cf:30ff:fece:c98
DNS Domain: ~.
lan
Link 2 (enp3s0f0)
Current Scopes: none
DefaultRoute setting: no
LLMNR setting: yes
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
---------------8<----------------
Any idea what was the IP v6 DNS server address fe80::22cf:30ff:fece:c98
assigned?
I fixed the problem by changing Network Manager IP v6 mode setting from
Automatic to Ignore.
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https://bugs.launchpad.net/bugs/1865474
Title:
sysytemd-resolved automatically use an ipv6 dns server on lan
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