Questions tagged [domain-name-system]

The Domain Name System, usually referred to by the acronym DNS, is a hierarchical, distributed database where the keys are domain names. Questions involving publicly accessible domains should include the real, Fully Qualified Domain Name (FQDN)

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Domain Double Pointing

I have one main domain basicdomain.com; About 100 domains's CNAME are pointing to that main domain. domain1.com, domain2.com, ... domain100.com All domains will show basicdomain.com contents. I am ...
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Microsoft DNS server doesn't add new DHCP lease from Linux

Server Setup: Microsoft DNS + Microsoft DHCP server Client Setup: Linux live CD as DHCP client Question: dhclient could get the IP assignment from Microsoft DHCP server, I could see the entry on the ...
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Postfix: How to reconcile when A record points to outside IP, but hosts file points to 127.0.0.1

Environment: Postfix 3.3, Node.js app, Digital Ocean Droplet Question: I have a Node.js app that sends email through Postfix. However when it attempts to send it throws a warning. Warning message: ...
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Can I use only A records, what do CNAME records bring to the table actually?

So I understand that A records point to an IP and CNAME records are just pointers to other A/CNAME records. What's the drawback of using only A records. Are CNAME records only for convenience and ...
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Updating a mutable named set in nftables with responses from bind

I need to apply an nftables rule to all traffic originating from a specific host, but the packets will not necessarily include the proper FQDN, so I need to rely on the IP address(s). The issue is ...
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Nameservers / DNS questions

I've got one VPS and I want to get one more. Currently both of my nameservers (ns1.example.com and ns2.example.com) are set to the IP of my VPS. What if I want to get one more, what should I do with ...
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Windows 10 fails to register host to DNS server on boot

So the situation is as follows. We have rolled out Windows 10 laptops that auto-connect to the wireless. The clients are Windows 10 and the DNS and DHCP server are Windows. When they are docked, ...
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Wildcard SSL with LetsEncrypt gives error

I want to create wildcard SSL for my website via LetsEncrypt. I followed the instruction and after running Certbot, it gives me a DNS challenge and says: Please deploy a DNS TXT record under the name ...
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DNS not resolving in all locations after a week

I recently moved one of my domains to a different server. it's been over a week and DNS has still not fully propagated, it appears to be stuck, nothing has changed for the past 3 days is there ...
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Wireguard VPN connection not resolving local host names

I have setup a Wireguard VPN on my raspberry pi and I can connect to it via client app on my mobile phone. I can access the internet though the phone and I confirm that the phone is using the same IP ...
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My debian apache server is running on my ISP DDNS URL but I want to use my own domain name, how should I redirect the domain? [closed]

so my ISP ddns address gave me myname.ispddns.com:44567 which I can access my server just fine after I forward 44567 to 80. However, I want to use freedomain.tk that I have registered for this ...
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What does OPT PSEUDOSECTION mean in `dig` response?

This is part of the response when I run dig in terminal: ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 What does OPT mean? What does PSEUDOSECTION mean?
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Under which circumstances will the NS records at the apex of a zone be queried?

At what point do the NS records defined at the apex of a zone are queried during normal operations? From what I've researched these records are used by: DNS NOTIFY, for the master to signal slave ...
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Trying to change a DNS record which points to an old legacy website and make it point to our new ecommerce site

We took over the business of a good customer when he retired last year. The takeover included a deal with a web company that had been charging hosting and card processing fees for an ecommerce site ...
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How do I disable systemd-networkd.service so that connman.service can enable DNS?

I have Automotive Grade Linux (Halibut 8.0.0) installed on a Qualcomm board. This is an embedded system with no package manager, no build tools and no working DNS, but I can bring up ethernet okay. ...
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How do i find ip addresses for my nameservers? [closed]

I am trying to update the Cloud Dns servers on godaddy, but i am faced with the challenge of providing Ip addresses for each of my cloud dns generated servers. Where can i access the ip addresses?
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What are the IP adresses of DNS servers? [closed]

I've been wondering for a while, what are the IP addresses of DNS servers? Every computer on the internet must have an IP address. DNS servers are just computers on the internet. If a client computer ...
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BIND9 Sharing some domain records across views for a same domain

I have a design problem in my BIND configuration. I have 2 views with the same zone caen2018.com (splitted for 2 different LANs: CAEN & PARIS). In each zone I have DDNS record, but I want my DDNS ...
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40 views

Reject email and force the sender to switch MX records

I am setting up a mail server solution. I want to apply the scenario like this: The domain used is configured with 2 MX records (one with priority 1 - my server and one with 10 - a third party STMP ...
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How do I set correct name resolution in dnsmasq on a per-client basis?

Here's the story: On my local network I'm using a Raspberry Pi with dnsmasq for name resolution and DHCP. Our household consists of two adults & two kids, and I'm looking at restricting internet ...
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Ubuntu server 18.04 dns reverse search zones not working

I want to setup reverse search zones using BIND9 but i cant get it to work because i get NXDOMAIN error Screen of named.conf.local And screen of zone configuration file
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Samba/Linux: How to register only certain IP-Adresses in Windows AD DNS?

I have set up Samba 4.12.14-Deb on Jessie as a member server for my AD and (so far) everything works fine. This machine does have a few Tun* Interfaces for openVPN tunnels (which are also working fine)...
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Set ip and domain name in offline network matching online one [closed]

TL;DR: I'm writing mobile app, that should work both in the internet or while connected to some "offline" wi-fi network. I need it to switch between online and offline api-servers seamlessly. Details:...
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How to let Samba not update Windows DNS for all interfaces

I have set up a Samba as a member server (fileserver) for my AD. It can be accessed, files are working, the machine has added it's FQDN to my Windows DNS and everbody is happy. No I had to add a VPN ...
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Using bind 9.11 with Masters Only

a little bit of background Information before asking the question: Our current setup is: 1 Master bind and 1 Slave bind in Datacenter A 2 Slave binds in Datacenter B 2 Unbounds in Datacenter A 2 ...
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Allows customers to add custom domains with firebase/google cloud?

I'm currently working on an app that let's app users create their own landing pages. Just a little preface the app runs on firebase cloud functions, hosting, and the auth service Google provides. I'm ...
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DNS with BIND9 on Debian

I am trying to create my own dns using Bind9 and Debian 11 One Virtual Machine in Google Computing Engine has these configuration Server 1 Google Cloud IP 35.206.115.212 The file /etc/hosts 127.0.0....
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What happens when specifying multiple dns servers with DHCP Option 6?

If I have the following DHCP option 6 (DNS), what happens? 6,1.1.1.1,8.8.8.8 Will 1.1.1.1 be served, and 8.8.8.8 as fallback if 1.1.1.1 fails? Extra context: I am running odhcpd on OpenWRT with pi-...
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Bind9 caching DNS server works only when forwarders enabled

So i used bind9 in a small server with multiple NICs in order to setup a cache-only recursive DNS server for my home network. Unfortunately its not working, meaning DNS queries from the hosts ...
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DNS DDOS Attack - would like to understand log

As part of a DOOS attack (largely inefectual) I am currently seeing log messages of the form: <DATE> client <EXTERNAL-IP>#3074 (<NAME>): query: <SAME-NAME> IN RRSIG + (<...
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Mapping suffix of DNS `A` queries in dnsmasq and pass mapped query to upstream

Let's consider that we have dnsmasq server (as forwarder) and it's get A query about resolving host-1.mycompany.com. Is it possible to forward from dnsmasq to upstream query about: host-1.yourcompany....
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Domain Cname recordnot working properly [closed]

I am quite new about domain and server. I got some issues related to domain DNS. I have CPANEL and I did the following operations on CPANEL. Let's say my main website is example.com If a user ...
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24 views

CNAME record resolution

I would like to understand how the process works for CNAME record resolution. Lets say I have a record on the DNS server NS1 proxy.example.com IN CNAME proxy.example1.com NS1 is not authoritative ...
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windows server dns, disable root zone request

Good day. I have a simple problem, but i can't solve it. I have a DC with domain sub.domain.com. And i have a publick domain with a website domain.com, hosted to another server and another dns. When i ...
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Command line dig tool doesn't get answer for SOA query, while https://toolbox.googleapps.com/apps/dig/#SOA/ DOES

While running in my windows 10 64bits machine this command: dig gmail-smtp-in.l.google.com ANY I get this response ; <<>> DiG 9.16.2 <<>> gmail-smtp-in.l.google.com ANY ;; ...
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CNAME and Nginx

Let say I have such kind of record in my extdomain.com: extdomain.com CNAME abc.newdomain.com www.extdomain.com CNAME abc.newdomain.com And I'd like to use nginx proxy_pass to use ...
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.site domains are extended in kubernetes with the system domain

I would like to use the Heimdall application as a start page for my Kubernetes cluster. The application loads configuration data from "https://apps.heimdall.site/list". This domain is extended within ...
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DNS in HA with Nginx & iptables

I have two DNS servers dns1 & dns2 and I want to do failover load balancing between the two. I'm using Nginx as load balancer to dispatch DNS request to the authority servers. Clients --> ...
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AWS Route 53 configuration problems for S3 hosting

I have a static site hosted on S3, mylifeinlimbo.ca I have set up S3 with a bucket for www.mylifeinlimbo.ca which redirects to the main bucket and created an 'A' record in Route 53 (see image for ...
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Migrating zone file from registrar to DNS provider

I own a domain, managed by my "registrar". I also have a VPS, managed by my "hoster" (e.g. DigitalOcean, etc.) I want to use the hoster's DNS services, so: I must change the NS records (in the ...
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One SSL Certificate for two servers?

we have set up one productive server and a testing environment, which are two VMs with different internal IP addresses. Our public DNS server points software.example.com to our public IP address. If ...
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1answer
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Using a Public Domain Name for Private Internal Use on my Private Network [closed]

I'm an IT Guy/Student, looking to learn about servers and networks. How to build them, how they interact, etc. So as of right now, I'm trying to build an Active Directory Server. The University I ...
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1answer
17 views

Problems with TXT record in combination with other Records

I have currently the following DNS setup. Domain: domain.tld Example IPv4: 1.2.3.4 Example IPv6: fe80::1 Host Type Destination * A 1.2.3.4 * AAAA fe80::1 This setup works perfectly as expected. If ...
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Fallback to forwarding with Unbound?

I'm using Unbound on an internal network What I want it to do is as follows: If a local_zone matches, return from there If not and it matches the internal domain name, then try forwarding to Consul ...
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51 views

What should be the SMTP server when using the Amazon MAIL FROM domain?

I have set up a MAIL FROM domain with Amazon SES by following their instructions: https://docs.aws.amazon.com/ses/latest/DeveloperGuide/mail-from.html They have verified that the DNS records were set ...
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Setting up my own nameserver on Freedom domain

I need to configure a DNS on a new domain registered on freenom.com as follows Domain: mydomain.ga My Server IP: 1.2.3.4 My need is to ask mydomain.ga (1.2.3.4) for a specific subdomain (for ...
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How to make both the website and dockerized webmail work together on same server

I'm having new VPS machine where: Install nginx on main host to serve my domain website (e.g. example.com) on ports 80,443. example.com conf in host nginx: server { server_name example.com www....
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How to fix trust error with two Active directory Domains

There are two Domains and there is a trust between both domains, this works fine for a long time but now we get access denied errors. So I open "Domains and Trust" and validate the Trust between both ...
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Working around bogus Windows-10 default DNS addresses fec0:0:0:ffff::1%1

I have an app that binds to all network interfaces. On one Windows 10 machine it starts VERY slowly. Turns out it's trying to do DNS name resolution for each of several different network interfaces ...
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1answer
50 views

Google App Engine with custom domain from Google Domains with SSL

I am trying to get a custom domain linked to my Google App Engine project and am completely stuck - it will just not work. I am trying to do everything through Google - I have no third-party domain ...

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