Questions tagged [systemd-resolved]
Systemd Network Name Resolution manager
132 questions
0 votes
2 answers
47 views
Why does systemd-resolved fallback to last DNS-Server in the list
My DHCP server returns 3 DNS servers in this order 10.10.0.100 10.10.0.101 10.0.0.1 I can dig all of them from my client (fedora 42, kde plasma): ➜ ~ dig @10.10.0.100 +short google.com 172.217.208....
0 votes
1 answer
461 views
Dealing with systemd-resolved failing to work after a period of time
In Ubuntu 24.10 systemd-resolved often goes comatose and stops resolving everything. The following messages are logged: Apr 21 12:50:27 localhost systemd-resolved[5452]: [🡕] DNSSEC validation failed ...
- 32.9k
2 votes
3 answers
325 views
Replacing a string in a file with GAWK issue
I have a program that will run a set of commands against new server installs and I need to change an entry in a file for each install. We need to change the default DNS from 127.0.0.X (which it ...
0 votes
2 answers
715 views
Resolve an IP to FQDN in domain that are not in resolvctl config
I want to use basic tool available without installing anything to solve an IP into it's FQDN. I know the domain in which I can solve this IP. The command line or the tool should be available on any ...
- 9,892
0 votes
0 answers
202 views
systemd-resolved: Unexpected Behavior with Single-Label Names and Search Domain
I am using systemd-resolved on Ubuntu 24 LTS to manage DNS resolution. My goal is to implement split-DNS with the following behavior: Single-label names should be resolved by a local dnsmasq server ...
- 9,269
0 votes
1 answer
177 views
Implement UDP packets filtering in C
I have a question on how to setup the filtering as described in the following scenario: I see that systemd-resolved listens on port 53 and sends all the DNS requests to the real DNS resolvers. I am ...
- 103
1 vote
0 answers
152 views
Debugging systemd-resolved cache / systemd-resolved returns outdated responses
I updated the DNS settings at my DNS provider for my domain. While all public DNS servers including the DNS resolver of my router have picked up the new settings after some hours, systemd-resolved ...
- 422
0 votes
1 answer
135 views
Bypassing DHCP DNS with systemd-resolved
The issue Changing the DNS option in resolv.conf from the VM's gateway to 8.8.8.8 will result in no DNS resolution. resolvectl query google.com succeeds if I set DNS to my gateway. The set-up /etc/...
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