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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Two different DNS for same server with two different IP addresses [closed]

I'm very new in the topic of DNS, and I'm deploying my first app in a centOS 7 server. I already configured all of my app in the server, but I'm having a big problem with a domain that I acquired. The ...
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server can't find :NXDOMAIN — Ubuntu 18

Went thru all possible available solutions over the internet, before posting the question here. I'm trying to replicate my working DNS production server onto a staging environment using the same ...
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SMTP 550 mailbox unavailable on MAIL FROM

My company hosts our own mail server (Vircom ModusMail) and we recently starting having and issue sending mail. It seems to be happening to many different recipient domains (gmail, msn, hotmail, ...
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Nameserver is not updating

I have a domain https://t2evolve.eu on Rootpal. I changed this domain's nameserver many times and waited for 48 hours. But Nameserver is not updating. after changing nameservers I checked them many ...
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Different nameserver and glue record

I have a domain called domain.com (already working and in production) and that domain is already using ns1.example.com and ns2.example.com as nameservers. Now I have created new Authoritative DNS ...
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How to change the hostmaster mail adress in DNS

I have a domain and it seems the "hostmaster" e-mail address is assumed as "hostmaster@domain.com". However, this address does not exist and it is not visible in the DNS entry. ==&...
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Why are there always at least two authoritative name servers for a registered domain?

I see that almost all registered domains have at least two authoritative name servers configured (and for most of them, exactly two), and that using two servers provides redundancy against any kind of ...
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Unable to get a certificate from Letsencrypt using the DNS-01 challenge

I've tried getting a certificate using certbot, caddy, and lego. They've all returned similar errors with this domain. I used the DNS-01 challenge. Here's output from the lego client: ananth@wopr ~>...
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1answer
37 views

Fallback options for private DNS servers

I have a private DNS server that is used across locations, configured on routers and on mobile devices. For routers, it uses the IP for DoH/DoTLS. For mobile devices, it uses the domain "dns....
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1answer
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How to configure a DNS server by YAST2

I run these commands to install DNS server dependencies on openSUSE Tumbleweed: sudo zypper in -t pattern dhcp_dns_server sudo systemctl enable named.service sudo systemctl start named.service To ...
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How to configure DNS records correctly?

I've got app on GCP up and running. I can view the app after typing its external IP so I know the app works fine. Now I'm trying to point domain purchased on Godaddy to it. After following a tutorial ...
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domain CNAME to subdomain [duplicate]

Please help, I had a questing regarding DNS delegation and CNAME. Is it possible to CNAME parent domain to subdomain example I had domain example.com and I want to CNAME it to sub.example.com. The ...
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637 views

Can't Ping UNC Path With DNS A Record On Server

THE SETUP The following image is understood as such: VLAN 10 (192.168.4.X) is a management VLAN connecting servers and equipment together. VLAN 20 (192.168.10.X) is a production VLAN used by users ...
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Trouble Configuring Subdomain on Digital Ocean

I've just setup a Ubuntu droplet on Digital Ocean, and I'm having trouble pointing my subdomain to the droplet IP. The main domain is working just fine (it points to a different droplet). When I set ...
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dnsmasq - detect mx-host changes without service restart

I have a mailserver on ubuntu with postfix and dnsmasq. It has a bunch of mx-host records on the /etc/dnsmasq.conf config file. I need to dynamically update (add/remove) these mx-host entries (and the ...
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AWS EC2 Elastic IP vs Public DNS Hostname?

What is a better approach for a webserver using EC2: to use its public DNS hostname as a CNAME record, or to attach an Elastic IP to it and use it with an A record? I suppose using the (elastic ip) A ...
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rhel + resolve.conf + what is the right resolve.conf settings

we want to know what is the right configuration in resolve.conf and about domain name in resolve.conf in our rhel 7 server we configured the following example of resolve.conf more /etc/resolv.conf ; ...
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RE: HELP! Google cloud DNS problems

I love google cloud hosting..My domain DNS Zones is not propagating for more than 7 days now and it's pointing to google cloud servers. I have contacted namecheap and they said i should check google ...
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Bind9 completely stops responding to queries

Due to a massive number of requests on each of the application servers (sending a few thousand api calls each second to a few hundreds domains) I've decided to install Bind9 on each app server as a ...
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1answer
52 views

How do I connect a subdomain to a custom gameserver through DNS or some other means [closed]

So, me and a friend built a custom gameserver in java. This gameserver listens for HTTP and TCP messages from a specific ip / port given to it (Either localhost or the device's external IP address for ...
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23 views

How do I route dns traffic through pihole? [closed]

I have been using my mikrotik with DoH since last year without any issues. So, I recently bought a raspberry pi for the purpose of blocking ads. My previous attempt of blocking ads with scripts in ...
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Why does DNS lookup on DNS server itself work via TCP but not via UDP? [closed]

I have AdGuard Home as a DNS server on a machine on my local network. The server is running on docker, with the DNS ports (53/UDP and 53/TCP) as well as a management port (80/TCP) exposed: $ docker ...
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1answer
31 views

How to configure Firewall Rules and DNS settings on GCP with VPC Service Controls when using Cloud Composer and Cloud Functions in the same project?

We have troubles with the configuration of two GCP components (the GCP Cloud Composer, the GCP Functions) under VPC Service Controls for a single project. We can configure them separately with VPC ...
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34 views

Reaching local DNS server behind Unify Security Gateway

Context While testing this python code that automates setting up ones own DNS server with Technitium DNS, I did not obtain the expected results. Expected results I first tried the automated local DNS ...
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Free Dynamic-Dns Paradigm and how the redirections work in this case

(For 4 minutes lecture) BACKGROUND In my high school we're doing a project and my friends and I decided to implemented to our town. So we decided to make a website, and now we need to create our web ...
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Unbound block list , How to know from query log that if domain blocked or not?

I have configured an Unbound server with domain block list, blocking works perfectly fine. But from the query log, i can only see that blocked domain is queried, that's it. I tired with server: local-...
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Client DNS Records Not Updating Unless They Are Unsecure

I have 2 member servers on my domain that are getting an event 8018 which looks like this: Log Name: System Source: Microsoft-Windows-DNS-Client Date: 4/21/2016 10:57:23 AM Event ID: 8018 Task ...
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28 views

Organizing DNS Records On Parent/Child Domains

Consider this diagram. A lot of colors I know. Let me break it down first. This is a parent/child domain that supports multiple network sections based on their function and need. The need for this ...
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1answer
16 views

SSL Certificate with subdomain on different server

Hi i have specific problem which i haven't faced before because i never had to run different certificate for the same domain and subdomain but other company is requesting to run their own certificate ...
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1answer
19 views

Slow external API request on NodeJS using Docker

I am trying to have a NodeJS server respond with data from an external API. Consider the index.js file: const express = require('express'); const axios = require('axios'); const app = express(); app....
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How to configure a static DNS on a DHCP Client with Cisco Packet Tracer

I'm new. I am having an issue with trying to get a Static DNS Ip assigned to DHCP clients. I have created a DHCP network, with VLAN segregation. Workstations are connected to a switch and acquire DHCP ...
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1answer
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What is the difference between dig +tries=x and dig +retries=x?

I have been looking at the dig documentation and don't understand the difference between dig +tries=x and dig +retries=x. Can someone explain please?
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Nginx and NodeJS how to remove port from url (403 error)

I have a NODEJS website with mongodb and express. I'm deploying my website to "mydomain.com", but accesses to "mydomain.com" result in a 403 error: 403 Forbidden nginx/1.14.2 ...
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24 views

FreeIPA/IdM - delegate subdomain to separate BIND server

I've attempted to follow the instructions in these ariticles, along with a 3rd article in Red Hat Solutions. They all pretty much say the same thing, as far as steps to follow: Setup your subdomain's ...
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1answer
25 views

Nginx redirects www but no non-www

I've configured a DNS server with Bind9 in a server with 192.123.100.251 IP adress with the following configuration: named.conf ========== include "/etc/bind/named.conf.options"; include &...
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PowerDNS Recursor Whitelisting

I am new in networks and stuff and was assigned to whitelist specific domains(say for example google.com) in PowerDNS. This is what I tried. It's working but I don't know if it's the conventional way ...
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1answer
51 views

Site running without an EC2 instance on AWS

I have been doing a lot technical troubleshooting and research, regarding AWS(Amazon Web Services) hosting of an organization website on a remote webserver, The organization deployed a wordpress ...
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1answer
68 views

Domain registrar said I need to provide at least two of DNS servers [closed]

I'm trying to build a home server, like example.com should be bounded to my global ip 123.xx.xx.456 through my wifi router (tplink router) dynamic DNS setting. But the problem is that on the domain ...
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36 views

How to proxy a subdomain to a port in apache

I want to proxy git.example.com to example.com:3000 for gitea. I also want to enable https on the subdomain. Here is my configuration: <VirtualHost *:443> ServerAdmin webmaster@example.com ...
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1answer
74 views

Best practices for replacing a server while not breaking any URLs and not having any downtime?

I tried searching for an answer to this problem but the search term is so broad that nothing helpful popped up. We have an old server and we want to replace it with a new one (both are physical ...
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1answer
24 views

DDNS on my .com domain [closed]

com domain with some subdomains all dns A records point to the same IP of my computer (used as a server) that host a kubernetes cluster, subdomains are used for the routing. Since I have a dynamic IP (...
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1answer
24 views

different AWS accounts manage different subdomains

I've checked this answer but it didn't help. I'm moving example.biz to R53 zone in one AWS account ("parent") and want to manage subdomain api.example.biz in another ("child") ...
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1answer
38 views

VLAN and DHCP conflicts. /renew and release only works temporarily [closed]

In our small company, we have VMs on ESXI. One of them being the Domain Controller. We have Avaya phones with their IP being (192.168.0.11), our IP range is mutually exclusive from Avaya. Our Desktops ...
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2answers
25 views

Access URL in CompanyA from CompanyB with Two Way Transitive Trust and DNS

I'm trying to access CompanyAWebsite.CompanyA.com from CompanyB without having to type in the FQDN and vise versa. I thought this was the purpose of CNAMES in DNS but I must be doing something wrong. ...
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4answers
473 views

Size of top-level domain (TLD) servers? Especially .com? [closed]

Sorry if this is a silly question or if I'm asking in the wrong place. But I've been learning about DNS, and there's something that's bugging me about top-level domain (TLD) servers especially the ....
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Interpreting my LDAP nslookup output

C:\Users\myuser1>nslookup Default Server: ns-xxx.xxxx.com Address: 1xx.xx.x.x > set types=all > _ldap._tcp Server: ns-xxx.xxxx.com Address: 1xx.xx.x.x Non-authoritative answer: _ldap....
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56 views

Why does AWS use host names for their load balancers instead of IP addresses?

I'm getting to know how load balancers work in cloud platforms. I'm specifically talking about load balancers you use to expose multiple backends to the public internet here, not internal load ...
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1answer
49 views

What happens if you make a mistake when you change the authoritative nameservers for a domain?

Say for example during a DNS migration to cloudflare, rather than transfering to "fred.ns.cloudflare.com" you typo'd "ferd.ns.cloudflare.com" or something similar for NS1, and the ...
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1answer
66 views

Nameserver invalid warning from an intoDNS.com test

I made my own nameserver configuration, but as you can see in the picture and the intodns.com link, I am getting a (hostname) warning. WARNING: At least one of your NS name does not seem a valid host ...
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42 views

Non-Admin - how to change DNS & Default Gateway [closed]

I have a small company where I'm hosting Windows VM servers from an ESXI host. And a PDC where I had set up Active Directory etc. Everything was good, but randomly the user's DNS changed to 8.8.8.8 ...

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