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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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3answers
131 views

Windows Domain controller as dns

Im creating my first domain and joining pcs to the domain. Why do I need to specify my dc as the dns to join a pc to that domain?
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0answers
63 views

Caching, forwarding Bind 9.9.4 server works for weeks, suddenly SERVFAIL on all queries (rebooting fixes it)

I have bind 9.9.5 running on two servers (CentOS 6 and 7), for caching and forwarding DNS queries for a mail server. The servers run fine for weeks, then suddenly respond to all queries with SERVFAIL. ...
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1answer
60 views

Postfix warning: dns_get_fixed

I have a recently setup Postfix/Dovecot simple mail server (if there is such a thing). It was stable, and worked without issue for about 2-3 weeks, until I wanted to get SPF setup. Now, it still ...
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1answer
30 views

Windows Mapped Drive of DNS A Record Seems Cached

I have an A record setup for a specific host IP. I'm then using the A record as the part of the UNC path for a network drive mapping (X:). net use x: \\my-arecord.host.com\share My problem is when ...
2
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1answer
88 views

Override DNS entry when VPN connected without DNS server

I have moved a server into Azure, the server is working perfectly however now I want to connect users to the server when they're at home using a VPN. I have setup the VPN in Azure and this is working ...
2
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0answers
74 views

DNS doesn't resolve some domains on huge amount of requests

I need to check 200kk (200,000,000) domains for availability and CMS information. I'm using php 7.1 and simulating multi-thread check. Hardware and config The server hardware: Multicore CPU, 64GB ...
2
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1answer
998 views

Requests can't be forwarded to peer network because the peer project disabled DNS peering

I am trying to get cert-manager works with my GKE. I had followed the official documents and had tried dns01 with no luck. Currently I believe I found the missing manual it called customized DNS. In ...
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0answers
39 views

systemd-resolved not cache not effective when queries from haproxy

We're running HAProxy 1.8 on Ubuntu 18.04 and we've been noticing slow startup times. We've previously pinned slow startups on DNS lookups, since we have lots of backends which HAProxy has to resolve ...
4
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1answer
63 views

Should I reject mail to test domains?

RFC6761 states about example domains (such as example.com): Application software SHOULD NOT recognize example names as special and SHOULD use example names as they would other domain names. ...
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1answer
49 views

Split DNS for entire zone

I have my company.com domain's DNS servers hosted with Office 365, where all the Exchange/Skype records are set, but I also added the custom @/www A records for the public website. Now I am setting a ...
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0answers
86 views

BIND9 SERVFAIL using dig on UBUNTU server 18

I am setting up a nextcloud+onlyoffice server on ubuntu server 18 and a LAN DNS for my office to go with it. I'm not a real IT guy but I follow tutorials and read forums. Also, being in China I don't ...
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0answers
101 views

Websites won't load (empty response) on any browser on every client on site if “https://” is not specified

I am observing a client-side but site-wide problem when trying to access websites at my location: Websites won't load if I type in any URI in my browser if I don't specify the scheme (https:// mostly)...
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1answer
41 views

Zone in Bind9 successfully loaded. How to debug? Ubuntu

I am new to this SysAdmin-things. I installed Bind9 (apt-get install bind9) on Ubuntu Server 18. I configured forwarding, setup the zone. But it does not work. The log says that the new zone is up. ...
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1answer
46 views

How do I edit my DNS to host a Web Server and Email Server?

Originally I was using one server (server A) which handled the web serving and email serving. This all was working fine. Yesterday I wanted to take the web serving load off of the first server (...
1
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1answer
39 views

What type of query is generated while resolving DNS?

DNS resolution is in following steps:- Browser send a query to the resolver. (if not found in host file) Resolver checks its cache, and if record is not found, it forwards to root DNS server. Root DNS ...
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2answers
46 views

DNS only works when domain prefixed with https://

I bought the domain example.com (of course, that is not the real name of my domain) from GoDaddy (I doubt that the fact that it is through GoDaddy is relevant, but I do not know). When I type ...
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1answer
44 views

Bind9 - forward all queries excluding one domain

I have following simple bind9 configuration acl "allowed" { 127.0.0.1/8; 192.168.0.1/24; }; options { directory "/var/cache/bind"; forward only; forwarders { 8.8.8.8; 8....
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0answers
71 views

Why does an NS query for this domain only return one NS record?

I'm trying to figure out why an NS query for a domain only returns one NS record rather than both the NS records set via the registrar. I don't have access to the DNS server. If I query the roots, ...
1
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1answer
93 views

using (windows) PowerShell to perform a dynamic DNS update with TSIG to a BIND9 server

I run BIND9 DNS servers and allow Dynamic DNS updates from my customers by using a TSIG key. One of my customers uses only a Windows environment, and therefore PowerShell to run scripts. He wants to ...
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0answers
35 views

Why does Apache need such a long time for initial connection?

I am running apache 2.4.18 on ubuntu. Serving about 500.000 PI per month. No big deal without peaks. Somehow it started now to take a long time for the initial connection, after restarting apache it ...
1
vote
2answers
31 views

AWS Route53 Aliasing

I have an AWS Elastic Beanstalk environment running my website. There's an existing domain which I would like to use for the AWS-hosted website. So far I've got it working by copying the four AWS ...
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1answer
67 views

Dkim record fails - A public-key (p=) is required

I setup dkim record using following tutorial. But when I check the mx records using googleapps toolbox and dkimcore cheking tool it gives error google says dkim is not setup, dkimcore says A public-...
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2answers
81 views

Can an authorative DNS server be configured to recurse when unable to find record locally?

Hopefully this is possible to do. The question Is it possible to configure a DNS server that is authorative for a given domain, to "fallback" and recurse via Forwarders / Root Hints when it cannot ...
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1answer
27 views

Communication Issue between the Domain Server and the Exchange Server

The Domain Controller Server (Windows Server 2016) has IP's for DNS of 168 and 170 The Exchange Server (Windows Server 2019) can not ping 170 with the command prompt. The ping of domain returns 170 ...
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0answers
40 views

Cannot resolve some domains with dnsmasq

My machine runs ArchLinux, with NetworkManager and dnsmasq. Dnsmasq should forward all requests to Google's DNS 8.8.8.8, and therefore should simply act as a local cache in front of Google's DNS. For ...
2
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1answer
16 views

Not blocking off original domain when setting up BIND server

I am trying to set up a BIND server so that I can access my office SFTP servers with the same address both locally and from outside the network. This has worked well, however after setting up the BIND ...
1
vote
1answer
55 views

Windows Server as web server with VPN and DNS resolving incorrectly - options?

I originally posted this on the networking site, but have been advised to post here: I have my own HP Gen8 server running Windows Server 2012 R2. I've worked in I.T all my life but struggle ...
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1answer
98 views

BIND DNS Server not starting

BIND DNS Server is not working. When I start it, I am getting the following error. named.service - Berkeley Internet Name Domain (DNS) Loaded: loaded (/usr/lib/systemd/system/named.service; ...
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0answers
203 views

Unknown RR type in bind zone file [CENTOS 7]

I am experimenting with Bind at the moment and setting up an pimary dns on Centos 7. The settings have been configured accordingly and adjusted to what i want. But i am recieving error upon start ...
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1answer
167 views

How to hide web server IP?

We have a Windows server with 100+ websites hosted on it. Some tools like whoishostingthis.com provide hosting provider's name and tools like domaintools.com provide domain names of websites hosted ...
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0answers
31 views

Is there a way to force dig to query an authoritative server?

I often find myself doing: dig www.example.com @$(dig NS example.com +short | head -n 1) It's a bit like doing a dig +trace www.example.com but starting from the NS of example.com instead of ...
5
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1answer
860 views

Using AWS Fargate as web server

Using AWS Fargate, the process to get a custom Docker container running on AWS ECS is relatively straightforward. I was able to successfully test my container over the public IP assigned to the ...
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0answers
52 views

Clients not registering IP in AD with BIND DNS

We have one main office and several foreign offices. Most clients are Windows based, and connect to their respective domain controller. Some time ago, we switched DNS servers and we made changes to ...
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0answers
65 views

How to Route (only) DNS over Router OpenVPN Client Tunnel?

I am using a AsusWRT Router, it uses a Unix kernel with entware repos; I'm running DNSCrypt and dnsmasq, and OpenVPN runs on the router as well. I would like to forward all DNS globally on the network ...
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1answer
54 views

SPF errors when sending emails

I setup a mail server on mail.mydomain.com. I am able to receive email. Problem occurs when i try to send an email. I have two servers: mail.mydomain.com - which is on different ip (e.g. 1.1.1.1) ...
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2answers
381 views

domain name system - rDNS is not exist [closed]

I need some help with Reverse DNS as I have got a problem with it. I have setup rDNS on my hosting provider which I use rdns1.example.com and I have a server hostname which it is gateway1.example.com. ...
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1answer
21 views

How to restrict folder access to only subdomain redirect?

I want to redirect a subdomain to a folder such that the only way to access that folder is by the subdomain. app.example.com => example.com/app example.com/app => 404 Not Found Is this ...
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1answer
19 views

discover additional scripts loaded from other sites when visiting a website with DNS

I noticed a (relatively) huge amount of dns packets in my wireshark recording while only visiting plain websites. Sites like amazon, facebook, comodoca and many others are requested by dns packets. So ...
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1answer
30 views

Redirect archive.ubuntu.com to a mirror on DNS level

I rely a lot Docker images, and is impractical to change the /etc/apt/source.list for each of them, so I want to redirect archive.ubuntu.com to a mirror on DNS level (I have my own dnsmasq/unbound on ...
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1answer
48 views

Is it possible to redirect DNS quries to different URL/DNS like opendns

I have an unbound DNS Resolver in my office lab. I m using this service to block ads and unwanted domains. Is there any possibilities to redirect DNS quires to a specific URL/DNS that shows the site/...
2
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1answer
137 views

Conditional forwarding to AWS Route 53 nameserver fails validation

I am attempting to do conditional forwarding of a particular zone to a set of Amazon Route 53 nameservers that are authoritative for that zone. When I try to add the nameservers, it fails validation, ...
1
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1answer
47 views

Authoritative Forwarding Bind9

I have a server that I am running an authoritative DNS server on. I have a group of servers that I would like to be public facing and forward requests to the root authoritative server on. How can I ...
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1answer
40 views

What is the best practice when an web application server is restarting and show a page that the server is in construction

I'd like to restart my server and want to show clients that the website is under construction or something. What I can think of is that Change DNS setting to another server which has an html page ...
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1answer
27 views

Will individual website owners have to do anything to implement DNSSEC?

According to this article, "ICANN is calling for full deployment of the Domain Name System Security Extensions (DNSSEC) across all unsecured domain names." As someone who runs my own e-commerce ...
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0answers
27 views

DNS Lookup Fails but Trace Shows Address

I'm having a DNS problem with a domain. I'm trying to get an SSL certificate for it, but Let's Encrypt comes back and says that when it does a DNS lookup, it fails -- does not exist. When I do an ...
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1answer
38 views

Domain configuration for load balancing

Im setting up load balancing for my website and came across thispost about stackoverflow's infrastructure https://nickcraver.com/blog/2016/02/17/stack-overflow-the-architecture-2016-edition/ It ...
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2answers
3k views

What does @ mean in a hostname in DNS configuration?

I'm creating new DNS records in our DC (Windows Server 2016) and I bump into zones where there are a lot of records that do not have a regular hostname, only an "@". We are using scopes and policies, ...
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1answer
30 views

How to ping a server on a different network by the hostname only?

have two networks that I am connected to via my computer, two different routers and all. This computer is connected to a windows domain "Domain A", I can resolve the IP from any Computer Name from ...
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1answer
78 views

curl resolving invalid hostnames to own IP

When I curl an invalid domain, I get a response from my own webserver. Ubuntu 16.04.5, curl 7.47.0 For example: root@l ~ # curl -v foobar.x * Rebuilt URL to: foobar.x/ * Trying 148.X.X.X... * ...
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1answer
24 views

URL Pointing to Two Different Hosts

I updated my DNS yesterday from host FatCow to host HostGator. For 10 hours or so, the url pointed to the new host HostGator and I was able to work on my site. Last night, it on its own started ...