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Questions tagged [dns]

For questions pertaining to Domain Name System (DNS), a service that provides the resolution of host names to IP addresses. Use this tag when you are troubleshooting DNS issues, configuring a DNS resolver or server, or are trying to understand DNS's involvement in your situation.

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`nmap` showing different hostnames than expected

When I run nmap 192.168.1.*, I get a print out of all devices on my network. The hostnames are not what I expect. For example, the hostname of the Linux desktop (192.168.1.203) I am currently on is ...
Dylan Russell's user avatar
0 votes
0 answers
30 views

Investigating DNS leaks with systemd-resolved

I'm trying to maintain control over my DNS and I'm seeing some suspicious behavior. In particular, I want to ensure that there are no DNS leaks outside my VPN tunnel. I'm running Ubuntu 23.10 (Mantic ...
ALittleHelpFromMyFriends's user avatar
0 votes
0 answers
30 views

set default DNS in ubuntu

I am new with ubuntu few days ago I changed my dns like this : sudo vi /etc/resolv.conf and after adding two new DNS I saved it now I wanna to get it back to the default but when I open the resolv....
morteza mortezaie's user avatar
0 votes
0 answers
104 views

Docker daemon DNS fails

Summary of question: When trying to docker pull from any repository other than the default, e.g. docker pull mcr.microsoft.com/dotnet/sdk:8.0 the command fails with dial tcp: lookup mcr.microsoft.com ...
Aviad P.'s user avatar
  • 101
-1 votes
1 answer
26 views

Turris Omnia (Knot resolver): t.co does not resolve. twitter.com does

My Turris Omnia cannot resolve t.co, but has no problems with other domains such as twitter.com or x.co. Local names (hpdisk.lan) also work: root@turris:~# ping t.co ping: t.co: Name does not resolve ...
Ole Tange's user avatar
  • 35.6k
0 votes
1 answer
32 views

Have dnsmasq resolve multiple domains form local hostnames

I am running dnsmasq 2.90 inside a Debian 11.0 based docker container as part of Pi-hole 5.18.2. I would like to configure dnsmasq to serve the addresses of my local hostsnames for multiple local ...
Spritsail Arrow's user avatar
-2 votes
0 answers
38 views

What is the best way to confirm that my BIND DNS server is functionally correct?

Having read a lot of posts online I am still confused about how to check that a DNS server is working as it should. https://www.unixmen.com/setting-dns-server-centos-7/ What are the criteria required ...
achhainsan's user avatar
0 votes
1 answer
30 views

Why am I getting answer with AUTHORITY flag set to zero in BIND DNS Server configuration even though my server is authoritative for that domain?

https://fedoramagazine.org/how-to-setup-a-dns-server-with-bind/ I setup DNS server in bind as per this article Master=192.168.1.206=master.example.com Client=192.168.1.3=client.example.com // // /etc/...
achhainsan's user avatar
0 votes
0 answers
43 views

Wifi connects but no internet access on Ubuntu 22.04, works fine with Windows dual boot

I have my desktop dual boot with Windows and Ubuntu 22.04. I have faced this issue before, but earlier it just went away. The issue is, my spectrum wifi connects to all devices including Windows on ...
Nevin Baiju's user avatar
0 votes
1 answer
22 views

OpenVPN client - DNS will get set only on the 1st launch

OpenVPN client and systemed-resolved. When I run OpenVPN client, it'll get connected and will be able to load the target resources properly only during the very first launch, after reboot. On all the ...
barugaggi's user avatar
0 votes
0 answers
22 views

OpenVPN client won't load a target website. On Android and Windows everything works

I've been given an OpenVPN file to access certain domains which, without it, won't load. The clients in both Android and Windows with this very file work well. Whereas on Linux the target domains won'...
barugaggi's user avatar
0 votes
1 answer
38 views

Cloudflare resolves but Google doesn't. Why?

I am in Mexico. This fails: % curl -s -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=www.bispebjerghospital.dk&type=A' | jq . { "Status": 2, "TC&...
Janus Troelsen's user avatar
0 votes
0 answers
11 views

VM/LXC asks AAAA record in a IPV6 disabled proxmox cluster

I have a Proxmox cluster with IPv6 disabled. Following setting made on /etc/sysctl.conf: net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv4.ip_forward = 1 When I do ...
Haseena's user avatar
  • 101
0 votes
0 answers
21 views

Custom dns resolver isn't specific to Domain

I have a custom DNS resolver, similar to how Consul provides DNS. They have you set systemd-resolved like so. # File /etc/systemd/resolved.conf.d/consul.conf [Resolve] DNS=127.0.0.1:8600 DNSSEC=false ...
fideloper's user avatar
  • 101
0 votes
1 answer
27 views

F5 VPN's DNS resolution fails

At work, in order to access some private resources, I have to use F5 VPN if I use it on Windows it works just fine, but if I switch (dual-boot) to Ubuntu it doesn't work anymore. The VPN says that I ...
Aldisti's user avatar
0 votes
1 answer
20 views

dns resolution fails

I'm following the cloudstack quick installation guide to try out cloudstack. As server I use a centos vm. After the first step Configuring the Network, dns resolution fails, preventing my to make any ...
hobyte's user avatar
  • 113
0 votes
0 answers
21 views

Devilbox - error, "No Host DNS record found. " even after adding folder name in /etc/hosts/

I am using Devilbox and have been learning through documentation on how to work with it, I have created a folder inside /data/www/ inside devilbox folder and before that I have excluded the mention of ...
suborno das's user avatar
1 vote
2 answers
58 views

How can I ping my Linux system by name without manually typing hosts files?

If I install Windows on a computer, and plug it into my LAN, I can immediately ping it by name from any other computer. If I install MacOS on a Mac, and plug it into my LAN, I can immediately ping it ...
Sod Almighty's user avatar
0 votes
0 answers
89 views

nslookup outputs SERVFAIL error from configured local DNS

I was watching a YouTube tutorial on configuring Nginx and local DNS settings. As I followed along on my Ubuntu 22.04 host machine, I ran into an issue with the DNS server I had set up with Docker per ...
juanthehuman's user avatar
3 votes
1 answer
162 views

getaddrinfo doesn't return IPv6 on Linux, but does on Macbook

I have a simple setup. I added 1.2.3.4 yahoo.com to my /etc/hosts file. I didn't add any entry for google.com to the /etc/hosts file. On Macbook, I get 1.2.3.4 and yahoo.com's original IPv6 address as ...
anc's user avatar
  • 31
1 vote
1 answer
23 views

Suddenly cannot reach certain hosts on eos [closed]

On my home computer running arch Linux via endeavouros I suddenly cannot connect to certain websites after rebooting. I'm using networkmanager, and the sites include github.com, qwant.com and discord ...
Sheepyhead's user avatar
0 votes
0 answers
15 views

How to setup dynamic dns without a dhcp and restricting every device to only set ther own dns and reverse dns record

I have already setup a BIND9 DNS Server in my intranet, but not want to setup dynamic dns capabilities to my server with the following requeriments: No DHCP server required Every device sets their ...
Delfin's user avatar
  • 150
0 votes
0 answers
20 views

Ubuntu, BIND9 and name resolution

I have installed BIND9 on my Ubuntu 22.04 LTS server as my Primary nameserver for the domain home.twelsh.co.uk. It was installed via apt and the config files were hand rolled with guidance from a ...
twelsh37's user avatar
  • 101
0 votes
1 answer
59 views

Why do I get different browser behaviour when attempting to reach bitcoin.stackexchange.com and the alias of its IP in /etc/hosts?

I haven't found any browser that supports aliases defined in /etc/hosts even when single terms (without having to prepend in the browser with http://) are not interpreted as search terms for the ...
John Smith's user avatar
1 vote
1 answer
56 views

Unbound can't write logs to file

I installed unbound 1.13.1 and I want to use it as a recursive resolver and log everything into a file. Unfortunately, unbound does not write into the file and I get the error: Feb 15 11:46:53 unbound[...
Mnemosyne's user avatar
  • 161
0 votes
1 answer
31 views

Bind: Delegating a Subdomain With Its Own SOA

OS: Oracle Linux 8.9 Bind version: 9.11.36 (installed from rpm) I am having trouble creating a subdomain (powerwebappuat.lereta.com) delegated to azure servers. Normally this is not difficult. I would ...
Stephen Carville's user avatar
0 votes
1 answer
36 views

Recofiguring DNS/DHCP: a bit of advice?

I am administrating a LAN with a mix of Linux servers and Windows/OSX/Linux/other systems. A while ago I configured our DHCP- (isc-dhcpd-4.4.1) and DNS server (BIND 9.16.44-Debian) to implement DDNS, ...
j4nd3r53n's user avatar
  • 715
0 votes
0 answers
66 views

SSH tunneling over cloudflare tunnel for linux server

I need to connect to my linux server over cloudflare tunnel to protect my server. I have some user and need it for this. can every one help my? I tried this commands: mkdir Argo && cd Argo ...
ali's user avatar
  • 1
0 votes
0 answers
11 views

Can I I manually edit the records dnsmaq offers?

I use dnsmasq to provide DHCP to the household and to cache DNS records (and an odd TFTP) Now I'm trying to debug a fetchmail config file and I noticed my mailhost appears to have a broken server (or ...
GraemeV's user avatar
  • 148
0 votes
0 answers
36 views

MikroTik DHCP server sends wrong DNS server

I have a MikroTik (10.0.0.138) router, where the static DNS server 8.8.8.8 is set and DHCP is enabled. The configuration of the MikroTik is: To my understanding, when the MikroTik answers a DHCP ...
Geom's user avatar
  • 543
0 votes
0 answers
20 views

How to tell my LinuxMint system to update DNS server when using Python's protonvpn-cli?

When I run by example: protonvpn-cli connect --fastest --protocol udp the DNS domain names are not resolved. I need to edit /etc/resolv.conf to put (bogon IP): nameserver 10.2.0.1 How can I tell the ...
Mévatlavé Kraspek's user avatar
0 votes
1 answer
18 views

dns: empty response into my guest (specific domains)

In my host (windows) I'm able to get ip behind my domain: > nslookup.exe setools.t-systems.es Servidor: clients-susu1.dns.telekom.de Address: 10.199.135.102 Respuesta no autoritativa: Nombre: ...
Jordi's user avatar
  • 325
1 vote
1 answer
128 views

Why is Google DNS server not returning authoritative answer for itself [closed]

Why is the Google DNS server not returning an authoritative answer for its own domain ? I am using nslookup and dig under Redhat Linux 5.1 with Bind DNS v4.9.7. Test /etc/resolv.conf: nameserver 0 ...
mvanle's user avatar
  • 335
1 vote
1 answer
125 views

Weird init process listening on TCP port 53, LinuxMint Victoria

When I run netstat -nptl, I have this weird output: tcp 0 0 127.0.2.1:53 0.0.0.0:* LISTEN 1/init This is from dnscrypt-proxy's DoH service with default ...
Mévatlavé Kraspek's user avatar
0 votes
1 answer
99 views

Fedora 39 machine cannot resolve Fedora domain, but can resolve any other site fine

I have two machines, one running Windows 11 and other with Fedora 39. The windows machine can access any site, no issues. I've been using the Fedora machine for weeks and it was fine, but today I ...
xdavidliu's user avatar
  • 343
0 votes
2 answers
71 views

Is it safe to add CloudFlare nameservers to a VPS?

I have an Ubuntu 22.04 VPS with public IP and I access the VPS with SSH only, I didn't install a GUI like xrdp or VNC, I intend to add the CloudFlare nameservers to /etc/resolv.conf and maybe this is ...
TuanHaxor's user avatar
0 votes
0 answers
263 views

Docker Containers Unable to Resolve DNS Names

I am experiencing a persistent issue with Docker on Arch Linux where containers are unable to resolve DNS names. Containers can ping external IP addresses, indicating functional network connectivity, ...
marc.soda's user avatar
  • 203
0 votes
1 answer
35 views

How can I resolve JUST hostnames under the VPN's domain on the VPN's resolver, while retaining the default resolver

I have a home network running which uses DNS resolutions on .lan, for example my router is router.lan. This network is unfortunately 192.168.1.0/24. Which means it normally conflicts with whatever ...
Evan Carroll's user avatar
  • 31.2k
1 vote
2 answers
119 views

What is the difference between host and domain in dig?

When running dig you can specify a "server" (the DNS server you make query against), "domain" and "host". Since "host" is not optional, I'm guessing this is ...
Andrew Savinykh's user avatar
0 votes
1 answer
173 views

How to exclude dnsmasq used by libvirt from Mullvad VPN's "local network sharing" block

I don't use the local network expect dnsmasq for libvirt. With blocking local network I have no DNS on my VM. For that reason I want to exclude dnsmasq from the local network sharing block with split ...
clooney's user avatar
  • 81
2 votes
1 answer
534 views

How to parse strace recvfrom syscall?

I strace a curl command: strace -s 2000 -f curl google.com and see 2 DNS queries recvfrom(3, "\302\325\201\200\0\1\0\1\0\0\0\0\6google\3com\0\0\34\0\1\6google\3com\0\0\34\0\1\0\0\0\362\0\20*\0\...
Rocherlee's user avatar
  • 123
0 votes
1 answer
55 views

DNS resolve sometimes connection timed out

Good day to all. Made a command: nslookup kafka.zxc.stage @dns1.prod And sometimes I get an answer - ;; connection timed out; no servers could be reached For example, when I run a command every second,...
Tsunani's user avatar
1 vote
0 answers
161 views

ssh hanging when adding -T parameter with specific router

I'm having a very strange problem. From a couple of days I'm having problems with git, ssh and vpn but only when using amazon eero router. Using my smartphone hotspot or even just connecting directly ...
Skato's user avatar
  • 11
1 vote
1 answer
118 views

Why would curl fail to resolve a URL when drill can?

I am trying to configure my computer to resolve some domains using a local DNS server. The DNS server is at 192.168.1.123, and is itself able to resolve everything normally. On other computers, I ...
Bagalaw's user avatar
  • 945
0 votes
1 answer
87 views

short name a domain name

I have a DDNS service with noip.com, but the link I have is so hard to remember. It's working, I can resolve it using resolveip link and I get the current IP of the router. I tried to use /etc/hosts ...
Abd Alhaleem Bakkor's user avatar
0 votes
0 answers
44 views

Active directory server default gateway resolution issues

I am using a Raspberry Pi 2 running Ubuntu Server acting as an active directory domain controller with samba and kerberos etc as detailed in this video. I have three Windows 11 Professional clients ...
Oliver Ricketts's user avatar
0 votes
0 answers
251 views

Kali Linux in VirtualBox (Windows 11 Host) Cannot Ping google.com but ping -4 Works

I am seeking assistance with my Kali Linux virtual machine setup in VirtualBox hosted on a Windows 11 system. I have configured my VM with a network bridge, but I'm unable to ping google.com normally. ...
xenos92's user avatar
  • 101
0 votes
1 answer
272 views

Active directory server set up DNS resolution failure or VERY SLOW, can I route external DNS requests the traditional way, before the server existed?

I'm very new to the world of active directory, windows server etc., so I apologise if some of the questions I ask are a bit stupid, but I'll try and explain exactly what I want to do below, and my ...
Oliver Ricketts's user avatar
0 votes
0 answers
154 views

Can't flush dns in kali linux in Virtualbox. It seems like neither of these are my dns client: systemd-resolve, resolvectl, nscd, dnsmasq

It seems like there are no dns clients(????).... but it's impossibile, it's just don't know how to find it. $ sudo lsof -i :53 -S does not return anything. systemctl restart nscd #or systemd-resolve -...
Allexj's user avatar
  • 265
0 votes
0 answers
23 views

Diagnose and debug bind server configuration lookup with exit line

I'm using dig with dig someserver.com -p 53 @localhost checking if my bind server do what it should. However even if I have a rpz set up with a wildcard like *.com A 127.0.0.1 most of .com replies ...
user3450548's user avatar
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