Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: systemd (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1865474
Title:
sysytemd-resolved automatically use an ipv6 dns server on lan
Status in systemd package in Ubuntu:
Confirmed
Bug description:
lsb_release -rd
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
i installed focal from the netboot version mini.iso.
i encountered some problem on dsn configuration and i found that
systemd-resolved was using an ipv6 dns address
this is my netplan configuration:
network:
version: 2
renderer: networkd
ethernets:
ens3:
addresses:
- 192.168.1.1/24
gateway4: 192.168.1.212
nameservers:
search: [xxx.com]
addresses: [192.168.1.191, 192.168.1.206]
this is the output of "systemd-resolved --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 2 (ens3)
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::6670:2ff:feb5:d9c8
DNS Servers: 192.168.1.191
192.168.1.206
fe80::6670:2ff:feb5:d9c8
DNS Domain: xxx.com
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as you can see systemd is using the ipv6 dns server.
i found that such ip was the address of my openwrt wifi router. dnsmasq is
disabled for ipv4 lan interface on the router and i never configured an ipv6
network. Anyway i disabled all the ipv6 dnsmasq feature on the router and after
a restart this fixed the problem.
But i think that this is a bug.
In my netplan i never configured an ipv6 dns nor a ipv6 network; furthermore
none of my other ubuntu bionic servers showed such a behaviour.
Also another focal netboot installation i made three weeks ago didn't show
this problem.
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