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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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Supporting multiple domains under one mailserver

I'm running my own Ubuntu server using Postfix to serve my email needs for a certain domain (let's call it domain.com). The mailserver does not have a mailbox, it forwards received emails to assigned ...
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1answer
16 views

A record for root domain, CNAME for www

Good Day! Would just like to ask if this can be done. Doing a CloudFlare partial CNAME setup for a website (Since we cannot go the normal route and change the nameservers to CloudFlare's) problem is ...
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15 views

Round robin DNS in public network [on hold]

Is it possible for round robin DNS to work in public internet? I mean if it is possible that when one person connect to a public website with browser using domain name, and sends the DNS request the ...
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Specific sub-domain of DNS A record wildcard (*) doesn't work

I own two domain names (cyklussoftware.com and totalstudent.io). They are both registered through and managed by GoDaddy. Both of them have an @ and a * in their DNS A records. Both the @ and the * ...
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15 views

Is it possible to have name-resolution from Fortigate and local DNS server?

Can you advise on moving to a hybrid DNS? Currently, all our LAN machines receive their IP address from our Fortigate 60D (each machine is either allocated an IP address from the Fortigate DHCP, or ...
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1answer
17 views

AD PDC and SDC domain [on hold]

We have PDC and SDC on our network. I need clarification if our PDC server fail due to server fault, how to make SDC as acting PDC. What is the purpose of two DC's on same network. If PDC fail SDC ...
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13 views

How do I access docker container from external network using domain name

I have the following docker-composer.yml apache: domainname: dev hostname: server image: arm32v7/httpd:2.4 depends_on: - php - mysql networks: frontend: ...
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2answers
24 views

How can I speed up DNS Record Set updates taking effect?

I recently changed our DNS record sets and updated the CNAMEs and IPs. For example, I am now forwarding web.xyz.com to prod.xyz.com. I understand that these changes may take hours to take effect ...
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40 views

Problems with clients for secondary dns server

Good evening! Im trying to make a high availability environment on my work, in order to do that I setup a little lab installing 2 servers; one with WS 2008 R2 and the other with WS 2012 R2 (same as ...
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2answers
33 views

GSuite: “There should not be a mail exchanger set up on naked domain name”

I checked my domain name with GSuite's MX tool to find out why our email gets to Spam folders, and have resolved the main issues (SPF and DKIM entries were missing in our DNS settings). The last ...
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0answers
35 views

Dynamic DNS, basic configuration not working

I'm trying to implement DDns, where DHCP daemon updates dns records instead of myself. From what I understand, it should work. But it doesn't. I would be very grateful, if somebody points out my ...
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1answer
42 views

Registering linux hostnames on windows DNS

How do I register DHCP linux client's hostnames in a windows server DNS? I have a small-business mixed network with: DCHP Windows workstations (Example hostname: win1) About 10 machines Machines ...
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0answers
26 views

Dnsmasq unable to resolve local host

I'm unable to get my local DNS server to work and totally stumped. Here's what I have done so far to make it work... Dnsmasq configured on Ubuntu 18.04 ( Static IP: 192.168.1.100) /etc/resolv.conf ...
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0answers
29 views

Two windows servers for one site [closed]

This is a bit of a big question. First, I have two servers running Server 2016. On each of them I am running Hyper-V Virtual machines. Right now, I only have my DNS pointed at one of them, but I ...
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1answer
34 views

Tomato / dd-wrt blocking RFC1918-dns lookup

I have given a host an 10.0.x.x address in out public dns. (The reasons are irrellevant) The host can be reached from our locations through vpn, however, one site behind a Tomato can not resolve the ...
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2answers
33 views

Bind - Resolve two domains with a single server

I need a bit of help with BIND (Centos 7.5) Bit of a back story: We are running two domains on the network. One called company.domain.com and one called comp.domain.com company.domain.com has ...
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0answers
13 views

Frequent restarts of systemd-resolved on Ubuntu 18.04

After upgrading an EC2 instance to Ubuntu 18.04 I started getting occasional errors Resolving DNS for my database server in my PHP scripts like the following: Uncaught Exception: PDOException: PDO::...
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can ping server but can't ping or join domain (DNS issue ?)

Like you can see in the title, I have a server with a LAN domain (+ DHCP/DNS, AD, FileServer). After a blackout, we had to reset our routeur and APs and since then, I can't access the domain with the ...
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1answer
19 views

Correct DNS Settings for iRedMail (or other mail servers)

Given a fresh install of Ubuntu with a FQDN of example.com $ hostname -f example.com If user installs iRedMail (or another mail server) using demo.example.com as their first mail domain name. His ...
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0answers
21 views

DNS dynamic updates stopped working

Recently I noticed dynamic DNS updates weren't working on newly joined workstations. Not sure when it stopped. If I run IPCONFIG /REGISTERDNS on a workstation, I get one of the two errors below ...
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1answer
42 views

DNS requests with the term “router” in a subdomain always redirected to local router

It seems that my router (Mikrotik RB2011UiAS) is somehow hijacking DNS request that have the subdomain "router" in them and forwards them to itself. router.google.com, router.amazon.com, you name it,...
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0answers
37 views

promote server to domain controller over internet

I have been facing this issue well over couple of weeks now. I can use some guidance and help. Current Setup: Aws ec2 instance (windows 2012 r2 server) hosting "abcd.com" domain. It is also a DNS ...
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21 views

Error URL routing in AWS Route53 to EC2 after email service configuration

I configured the DNS based URL routing to my AWS EC2 instance successfully using Route53 at first and got the expected response. Later on I went on to add multiple Record Sets in order to configure ...
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0answers
15 views

How to Configure Google DNS or OpenDNS with Netplan? [closed]

I've tried setting up OpenDNS with netplan via the following two methods. And they don't work. I know because I issue the command sudo netplan try and I get an error. method 1 sudo vi /etc/netplan/...
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1answer
19 views

Set NS server for one level domain name

If there is a record in ns1.example.com: xxx NS ns2.example.com. is it possible to make yyy.xxx domain to be resolve in ns1.example.com ? With the current configuration *.xxx domain ...
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0answers
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MPLS/VRF: Allow access to cloud service with many (probably changing) IPs

Using (Mikrotik) MPLS, in an isolated VRF: Actually only allowing specific public IPs for a VRF like setting static route to 1.1.1.1 for public DNS to work in that VRF, how to allow Cloud/CDN ...
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0answers
13 views

OVH dns losing Amazon SES domain verification

TL;DR Is this something I can resolve myself or should I contact OVH / change DNS provider? I use Amazon SES for my web app's emails but I have a strange problem with the setup. I added the ...
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1answer
32 views

Split subdomains to separate DNS servers

Is it possible to have subdomains split on to two DNS servers? DNS server 1: mydomain.com A x.x.x.x DNS server 1: www.mydomain.com CNAME mydomain.com DNS server 2: xxx.mydomain.com A x.x.x.y I need ...
2
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1answer
86 views

Who needs to serve the SOA-record for a child zone?

Let's say we have name server A who serves for the domain name example.com and its subdomains. Then we have another name server B who would want to avail the custom-subdomain.example.com from name ...
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2answers
45 views

Specifying lower priority backup IP for a nameserver

Let's assume that I use EasyDNS as a DNS service provider. There I have an A-record entry for ns-at-premises.example.com pointing to the IP address 123.123.123.123, where a DNS server is located, at ...
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0answers
32 views

DNS change not updating on office network

I created a new website for a client on a digital ocean box. When we put the site live, the A record for the domain was pointed to the IP address of the new server. All appeared to be fine. However, ...
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1answer
35 views

DNS configuration for domain trust

I am the DNS administrator for domain1.com. We are setting up a trust with child.domain2.com. This will allow us to resolve all resources in child.domain2.com. There is also a resource in domain2....
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1answer
38 views

How to identify the server providing a DNS response?

TL;DR: Where, in a nslookup www.somedomain.com -debug will I find the name/IP of the server(s) which reply to the chain of queries? Details: I have a setup (Windows 10 machine) which is connected ...
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0answers
22 views

DNS client refuses to update Windows DNS server

Server 2016- DC and client Windows Integrated DNS Not sure why this is happening. I join a computer to AD and it updates DNS with its record. The IP changes on the client but the record never ...
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1answer
308 views

Can I use nested DNS wildcard records

I would like to have multiple dns entries with wildcards such that one entry is nested as subdomain of another CNAME *.example.com -> webserver.example.com CNAME *.api.example.com -> apiserver....
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1answer
23 views

Exclude a single record from DNSSEC - is it possible?

In a domain running DNSSEC, is it possible to exclude a single record from DNSSEC? For example, would it be possible to have mail.example.com running DNSSEC, but www.example.com not running DNSSEC? ...
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0answers
25 views

Configure ddns and master slave zones with update-policy

I try to configure ddns and master-slaves zones, and got a question how to do it with update-policy directive in bind configuration. I read bind docs and configure this: zone "tech.com" { type master;...
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1answer
27 views

Ansible & Terraform DNS creation on Active Directory with nsupdate

I'm trying to create a new DNS record on active directory with the nsupdate module. Both, Terraform and ansible works with key_name & key_secret. If I disable the secure only option on active ...
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1answer
34 views

Move to another email server by changing the DNS entry

I ended up in charge of an email migration. My company wants to migrate from their own privately hosted email server to an office 365 server. This is not about saving the old emails on the old server. ...
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1answer
24 views

How make a subdomain point towards Route 53?

I have a sub-domain of a domain name. Say it is documentation.mycompany.com. The DNS records for mycompany.com and all it's subdomains are controlled by their current data centre provider. I am ...
18
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2answers
3k views

DNS A record with https:// in the label

I recently encountered for the first time an A record of the form: https://www.example.com. <TTL> IN A <IP address> As far as I know, this record is deliberate (i.e. not an error)...
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2answers
55 views

DNS Name Not Resolving After Transfer to Route53

I transferred a domain name from GoDaddy to Amazon Route53 but I'm not sure I performed the transfer properly, particularly regarding the nameservers. My issue is that the domain name is not ...
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2answers
53 views

Why my https://MY_SITE.COM always redirect to the wrong server?

I have done every thing I could to solve this issue, and I could not find any solution. So, my problem is that I can't have lemeilleurducbd.com or https://lemeilleurducbd.com to redirect to www....
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0answers
25 views

Can a CNAME record be created for a domain handled by another DNS server

My website is hosted elsewhere and I have a small project hosted on Amazon S3. They gave me an endpoint to create a CNAME record, but my DNS servers are pointed to my current host, can I point my ...
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0answers
23 views

Should (or can) master and slave DNS servers have different RRSIG entries?

I've just configured DNSSEC on my master DNS server and in testing with dig from each server to the other, I found that while each server had RRSIG entries they were different. Is this expected ...
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4answers
1k views

Could a name server resolve IP addresses dynamically based on some strategy?

We have registered some name servers for DNS resolving for our website which is deployed in several data centers. Our current strategy of DNS resolve is that based on the different client IP ...
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1answer
66 views

Switch Active Directory from Public IP to Private IP

I have an active directory and some servers running on public IPs Like ADS --> 62.xx.xx.210 Server joined ADS Team foundation server --> 62.xx.xx.211 SQL Server --> 62.xx.xx.212 Exchange ...
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0answers
29 views

Failover Cluster Inaccessible [on hold]

I have a Hyper-V HA Win 2012R2 cluster, the FO cluster is inacessible and constantly reporting the below mentioned errors: Cluster network name resource failed registration of one or more associated ...
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0answers
28 views

svn: E000110: Error running context: Connection timed out

I am having an SVN server in India location. I have totally 6 client six servers in the different country. One of my Edge server facing an svn: E000110: Error running context: Connection timed out in ...
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0answers
37 views

DNS entry for intranet site via godaddy?

I have what I believe is a pretty newbie question. Wrote a simple site in asp.net. Published locally and got it to work with IIS 7 I believe. Decided to throw it up on an IIS server we have and it ...