You should check your system configuration, specifically how you have
resolved configured. Try looking at the output of:
$ systemd-resolve --status
Since you haven't even mentioned what Ubuntu release you're using, that's about
all I can suggest without more info.
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1875044
Title:
Host name not resolved
Status in systemd package in Ubuntu:
Incomplete
Bug description:
Systemd-resolved fails to resolve a host which has a private IP address, even
though its DNS entry is public. This happens even when I am connected to a VPN
where the host resides.
Interestingly, if I manually issue a `host -a` request, the host gets
resolved, and further resolution works until its cached entry times out.
Here's some hopefully helpful output of me running `nslookup` and
`host`:
# nslookup
> presto.lmta.lt
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
*** Can't find presto.lmta.lt: No answer
> server 8.8.8.8
Default server: 8.8.8.8
Address: 8.8.8.8#53
> presto.lmta.lt
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: presto.lmta.lt
Address: 10.41.0.118
> server 127.0.0.53
Default server: 127.0.0.53
Address: 127.0.0.53#53
> presto.lmta.lt
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
*** Can't find presto.lmta.lt: No answer
[^D pressed]
# host presto.lmta.lt
[no output at all. I immediately run the next command]
# host -a presto.lmta.lt
Trying "presto.lmta.lt"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20532
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;presto.lmta.lt. IN ANY
;; ANSWER SECTION:
presto.lmta.lt. 3599 IN A 10.41.0.118
Received 48 bytes from 127.0.0.53#53 in 57 ms
[then immediately afterwards:]
# host presto.lmta.lt
presto.lmta.lt has address 10.41.0.118
# nslookup
> presto.lmta.lt
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: presto.lmta.lt
Address: 10.41.0.118
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