Public bug reported:
From: https://discourse.ubuntu.com/t/blog-netplan-developer-
diaries/35932/11
Hi all,
NetworkManager connections with an explicit DoT (DNS over TLS)
configuration are not supported with Netplan, but NetworkManager does
feed back the DoT DNS info with server address and Server Name
Indication (SNI) in the form server_address#SNI, e.g.
1.2.3.4#dns.myhome.com as nameserver addresses to Netplan. As a result,
subsequent Netplan config applications fail because DNS servers don’t
have the expected dotted decimal (IPv4) or colon’ed hex (IPv6) form.
```
nmcli> describe ipv4.dns
=== [dns] ===
[NM property description]
Array of IP addresses of DNS servers. For DoT (DNS over TLS), the SNI server
name can be specified by appending "#example.com" to the IP address of the DNS
server. This currently only has effect when using systemd-resolved.
```
** Affects: netplan
Importance: Undecided
Status: New
** Affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: netplan-everywhere
** Also affects: netplan
Importance: Undecided
Status: New
** Also affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2055148
Title:
NetworkManager connections with an explicit DoT (DNS over TLS) are not
supported with Netplan
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