Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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)

-4
votes
0answers
17 views

How can manage DNS on CentOs and security of my clients domain [on hold]

Recently I started manage DNS hosting, Please tell how can i manage this. which tools required to perform this and how? and please guide me about networks.
-1
votes
0answers
22 views

Why does Google use short TTL settings? [on hold]

There seems to be serious drawbacks on having a DNS record with a low TTL. I have limited knowledge about DNS but this seems especially the case for popular urls. For reference see: SHORT DNS RECORD ...
0
votes
0answers
10 views

How to find DNS query look up time bypassing any intermediate cache [on hold]

I am in the process of choosing a DNS provider for my domains. I am looking for a DNS provider who gives me low query lookup times. Whenever I use any web based tools (like webpagetest, gtmetrix, etc),...
3
votes
1answer
40 views

Internal DNS TTLs

Four-site company using Windows Domain and DNS servers. Minimum of one DC/DNS server per site. One site is HQ and hosts most companywide servers and services. DNS records for Windows servers are ...
1
vote
0answers
15 views

Prevent “hostmaster” subdomain from redirecting to the main site

I host mainsite.com and othersite.net on a single Debian 8 server with nginx/1.6.2. Recently I discovered that Google indexed hostmaster.othersite.net and this subdomain shows full content of mainsite....
1
vote
0answers
14 views

Using an Elastic Load Balancer without Route53

We have setup an Elastic Beanstalk environment that spins up EC2 instances and adds a classic load balancer in front of them. Typically, you would set your DNS to Route53's name servers and then use ...
0
votes
1answer
20 views

Subdomain that uses Route 53 without migrating parent domain

I currently have a domain (asoba.co) that is hosted on Linode, and for which I use Linode nameservers. This site currently works as expected. My goal is to have an additional subdomain for a webapp ...
1
vote
1answer
25 views

Redirecting my existing NS records to Cloudflare NS

I run a domain parking service, let's call it domainparking.tld and users set their domain's NS to point to: ns1.domainparking.tld ns2.domainparking.tld now the problem is ... few of these domains ...
0
votes
0answers
17 views

HAProxy resolver doesn't work : could not resolve address

I'm on Ubuntu 16.04; I set up HAProxy as an entrypoint to services defined by domain names; those domain names are served by a DNS server (coredns) in the same machine (or VLAN network). Using ...
0
votes
1answer
33 views

Sendmail trying to find hostnames in headers for no good reason

I have a client who uses an external mail server to log and filter their inbound email before passing it on to their main mail system (which is Office365). The external server is running Sendmail, ...
0
votes
0answers
19 views

Migrating from Linode to Digital Ocean [on hold]

I am in the process of of migrating all of my Linodes to Digital Ocean and I was hoping someone could provide some guidance. Last night I migrated my first Linode to Digital Ocean with the domain with ...
0
votes
1answer
13 views

How to give a server a static IP address with OpenWRT/LuCI?

I have an OpenWRT router and a small home network on 192.168.0.0/24. I have a server which has the static IP 192.168.0.10. How can I set up an A record in OpenWRT/LuCI for it, to give it a DNS name? ...
1
vote
0answers
52 views

Does DNS need an A record, or is NS record all that is needed [on hold]

I have a domain pointing to a web server using Cloudflare as the DNS host. The name servers on the domain point to CloudFlare, and on cloud flare I have an NS record pointing to the name server ...
2
votes
2answers
41 views

MX Record Answer Contains Same Domain

What does it mean for an MX record to have an answer section that contains itself? My earlier belief was that this implies that a domain is it's own mail domain, but from running a couple experiments ...
0
votes
0answers
19 views

Server 2016 - AD and DNS setup behind NAT

We have a very bad network installation, with the following hardware and configs: ISP Modem/Router -> Netgear Router -> Netgear FW -> Server 2016 ISP Modem/Router provides connectivity to ...
0
votes
0answers
19 views

How to configure PowerDNS to return different IP based on client subnet

Our business network runs all over the country. In an effort to provide better, more localized service, I'd like to configure our PowerDNS to return different IP's based on where the client is (by ...
1
vote
1answer
35 views

Can a DNS server consult another DNS for specific domain name extensions?

For example, suppose I have multiple DNS servers under a private network which handle name resolutions for domains only hosted under said private network. Suppose also I use the name extension .wifi ...
0
votes
0answers
8 views

DNS bind is not working for me

I am trying to configure geo location based DNS. in /etc/named.conf I did following acl "BD" { x.x.x.x/28; }; view "asia" { match-clients { BD; }; recursion yes; zone "example.com" { ...
0
votes
1answer
34 views

hosts file rebuild after a while

I got a strange problem with my hosts file on windows machine. I save it with some default ip's - hostnames and after some time I notice again that some of the hosts have again tagged with the # ...
-1
votes
0answers
17 views

Adding SLES 12 (Linux) Server to Windows Domain Creating DNS Entries [closed]

Can anyone suggest how can I avoid Situation that when we add linux server (with multiple IPs on it) to domain creating dns entries with all IPs
1
vote
0answers
50 views

Different response from same Windows DNS server for domain and non-domain machines

This relates to a forward lookup zone added to a Windows DNS server. The zone allows machines to connect directly to a local email server when connected to the LAN. The same address resolves to the ...
0
votes
0answers
9 views

CentOS 7 VM running ExpressVPN, cannot mount NFS share while connected

I would like to have internet traffic routed through ExpressVPN, however I cannot seem to mount a local NFS share once connected. I have tried: expressvpn preferences set force_vpn_dns false Because ...
-1
votes
0answers
19 views

How to set a dns hostname on an interface in linux VM

I need to run Apache Cassandra on an interface such that, change in IP address does not affect my Cassandra server. I intend to set my seed node as a DNS hostname on the interface such that Cassandra ...
-1
votes
0answers
18 views

debian stretch + bind 9

trying to setup a secondary authoritative name server, no recursions. I get the following when running named-checkconf. /etc/default# named-checkconf /etc/bind/named.conf /etc/bind/named.conf....
1
vote
0answers
16 views

How can I route public external traffic to consul?

I've setup consul, and can now internaly resolve service hostnames to the appropriate IP. For example: dig @127.0.0.1 -p 8600 tickethub.service.consul ; <<>> DiG 9.12.3-P1 <<>&...
-2
votes
0answers
25 views

ERROR NETLOGON SERVER 2016 STANDAR [closed]

Good evening I have a problem with my server with windows 2016 standard constantly shows me warnings NETLOGON 5781. perform a test with the following results: dcdiag the error is shown repeatedly ...
-1
votes
0answers
38 views

Private network DNS configuration [closed]

My situation: I have a machine that is on the Internet and also a private network. The private network has its own DNS server for hosts on the network. If you query the server for an internet ...
1
vote
0answers
10 views

Repoint website in Azure App Service to Azure static site storage container blob with no downtime

I have a production website in an App Service with 4 custom domains bound to it and two SSLs. I have a newly developed static website that is deployed to a storage container static site $web blob. ...
2
votes
1answer
48 views

How to troubleshoot internal DNS resolution (Windows DNS server) pointing to a local server with a static internal IP address

To better explain the set up I have a Debian server in a private network with a static IP. There is a windows AD server that resolves DNS for clients internally. A domain name is already registered ...
0
votes
0answers
19 views

DNS records added based on info provided by Heroku, but URL still not resolving correctly

Awhile ago I registered the domain name www.testapp.id with my registrar (Namecheap). The application I want it to point to is a Rails app hosted on Heroku. I'm following the instructions on Heroku's ...
0
votes
0answers
25 views

Updated MX Record Causing Bounce

We recently migrated our company to a new mail provider (Gmail), and updated our MX/SPF/DKIM/DMARC records. Checking the DNS propagation via https://dnschecker.org/, all changes are reflected. ...
0
votes
2answers
30 views

How Do I Set The A Record In Office365?

Microsoft is managing my email via Office365 and the nameserver is NS1.BDM.MICROSOFTONLINE.COM. Now I am creating a website using stablehost as the hosting provider. However, if I change the ...
0
votes
0answers
14 views

DKIM “default” selector

I often see DKIM configuration guides using default as the selector. Is this a special selector or it is just a convention to use this if you only have one mail server? In other words, if I use the ...
0
votes
0answers
12 views

Why DKIM validation fails for yahoo, but pass for others?

Why does the DKIM validation for my mailserver fail for Yahoo but nor for others ? I saw this question, but I don't think it's the same issue and the answer was not helpful to me. MxToolbox gives no ...
-2
votes
0answers
27 views

How to register my own 8.8.8.8? [duplicate]

I could't make a good title for this question. How can Cloudfare, Google or Quad9 use short IP-addresses like 8.8.8.8, 1.1.1.1, 9.9.9.9 ect? There are also other companies such as OpenDNS Home which ...
0
votes
0answers
30 views

ActiveDirectory and DNS Practice Setup for Beginner [closed]

Not sure if this is the correct site in the network for this question, but here goes! I have a very strong software background (root cause analysis, troubleshooting, deployment and config). I’ve ...
2
votes
1answer
24 views

DNS service discovery and SRV record format conflict

In the RFC 2782 for SRV record type we can read: The format of the SRV RR Here is the format of the SRV RR, whose DNS type code is 33: _Service._Proto.Name TTL Class SRV Priority Weight ...
1
vote
0answers
40 views

Exchange Server 2016 Domain not hosted in the same server conflicts with certificate

I couldn't find any information related to my problem, so I hope you can help me find out a solution for it. We are working with an Exchange Server 2016 in a company that has a domain in a registrar (...
3
votes
0answers
19 views

Keeping DNSSEC KSKs offline with BIND9

I am looking to move the private part of the KSK for my domains off my main nameserver. I've tried this with a test domain and get errors like this: dns_dnssec_keylistfromrdataset: error reading /etc/...
-2
votes
0answers
19 views

The advanced page cannot be opened when we want to add Active Directory user

When we want to replace a local service account for a domain service account. Systematical we have this error (The advanced page cannot be opened) : https://image.noelshack.com/fichiers/2019/18/5/...
-1
votes
0answers
13 views

Why Amazon redirects a request to one of my Load Balancers to another Load Balancer?

I have two Elastic Load Balancers (Classic type) and two EC2 Instances. My goal is to have these two ELB pointing to the same two Instances, but each ELB have it's own SSL certificate, and in my ...
-1
votes
1answer
110 views

DNS lookup local - how does it work? [closed]

i have installed a server 2019 Active Directory with an DNS server. IP Configuration You can see my DC is the DNS Server (192.168.190.10). 192.168.190.2 is my router. My question: why is it ...
1
vote
1answer
15 views

Trying to set up haproxy letsencrypt for ssl termination. gateway not answering dns

trying to set up ssl termination with letsencrypt, but some weirdness is happening with dns. I am routing tcp to the existing host to allow the website at adomain.com to manage its own certs until the ...
0
votes
0answers
24 views

Reverse DNS Not Working on some Email servers

We host our email on an internal server. Recently we have started getting bouce backs from various other servers. Most seem to have the following error: Reason: Remote SMTP Server Returned: 550 ...
-2
votes
1answer
47 views

Nameserver responding REFUSED on Centos 7

I have domain registered with godaddy. I had set up custom hostname on godaddy and used same nameservers for the domain. ns1.domain.com and ns2.domain.com (both hostnames are pointing to same ip) Now ...
1
vote
1answer
12 views

AWS Load Balancer: changing A record

I have inherited a website that uses AWS for DNS and load balancing. However, the website will be migrated away to another server and won't need load balancing anymore. DNS will remain at AWS. I would ...
0
votes
0answers
7 views

Web browser DNS doesn't work with OpenVPN on Ubuntu 18.0.4

I am trying to set up OpenVPN to access systems at work. After a few issues with DNS I partially fixed it using the answer here: Openvpn client, force DNS server. On the command line I can now ...
-1
votes
2answers
32 views

CNAME pointing to domain instead of subdomain

I have a SAAS application which has 3 different subdomains. example.com app.example.com support.example.com I want to White Label the services only in support.example.com Example: testcompany....
1
vote
1answer
16 views

External Requests to Internal DNS Server

What would be the best way to configure my internal NAT network to handle external DNS requests? i.e.: Domain 'example.com' is pointed to my public IP address on the WAN port of the router. Internal ...
1
vote
1answer
34 views

SOA for DNS delegation

I'll first say that what I'm doing now seems to work, though I'm unclear on whether it's correct. I have a domain registrar company (inherited from a contract) and a name server company, separate ...