Newest 'domain-name-system' Questions

Q&A for system and network administrators

Domain blocked my domain for whois invalid data

My domain name domain.net is download video and converter web site. Name.com disabled my domain without notice. I can not transfer my domain. Name.com does not open the transfer lock. Do not change ...

Route to a specific server depending on origin address

I want to have some Windows computers point (map) to one server, and other Windows computers to point to another server - but using the same "FQDN". Ideally, the routes should be based on subnet ...

Bind Sub-Domain Zone Forward?

I'm wanting to host DNS for a domain while forwarding a subdomain to another server. Something like this: zone "xxx.test.com" in { type forward; forward only; forwarders { public-ip-here;...

What network configuration shall I use in VMWare Fusion to make two local machine communicate? [migrated]

So basically the question is the title. I'd like to be able to ping from a user machine a DNS I've configured following a protocol I know for sure is working. However every time I ping from the user ...

DNS is to slow, slow respond between server to Instagram API

I have app who is based on Instagram API, problem is because connection between my server and Instagram API is slow, e.g. OVH = 300ms - 400ms Linode = 400ms - 500ms Hetzner = 500ms - 600ms I try ...

change DNS records A for a lot of domains

I’m managing a lot of domains on different provider for my clients. These domains are pointing to the same server. If I would change this server I should change the IP address on DNS record for each ...

TXT record for multiple email providers not working

The main domain is configured with google account so we are using sub-domain: mail.fairwaytoursuae.com for sending mail via Mailgun. Everything is done as in the docs but still, one TXT record is ...

BIND server sends no query back

I've tried to configure my BIND-DNS server, so it will respond to to DNS requests made to a subdomain mail.prognoza.cu.cc of my domain prognoza.cu.cc . I've defined an NS record of mail.prognoza.cu....

How to fake DNS switch [on hold]

So, I'm moving my website to another server and I had to change name servers for my domain. It will take some time to propagate, but I was wondering if it were possible to trick my computer into ...

Different ip's for different locations with one domain

I saw many big websites have different servers in different countries. But how can they set different servers for different locations? I know there is dns load balancing, but as far as I know it only ...

nslookup fails but PowerShell's resolve-dnsname works

This is not a domain I have anything to do with, but I don't understand what's going on. The nameservers for sciencedaily.com are: ns-1414.awsdns-48.org. ns-1618.awsdns-10.co.uk. ns-300.awsdns-37.com....

CNAME not resolving but website loads

So this is probably a stupid question, but I just set up my first website and the site loads without issue. https://www.whatsmydns.net confirms that the A record and Nameservers have propagated ...

bind9 not responding to DNS requests

I am trying to setup a basic DNS server that just forwards requests from other DNS servers. I've installed bind9 and edited the /etc/bind/named.conf.options file as below. options { directory "/...

Server 2012R2 DHCP & DNS Updates

I have the following DNS settings configured on an DHCP scope: My question is, will the DNS entry be made against the DNS server that the DHCP is configured to go against or will it update the DNS ...

Monitor DNS queries of all hosts in LAN?

We have a simple setup: Some workstations (Mac and Linux) and a gateway router. For statistics and security purposes I want to watch all DNS queries done in our intranet. Unfortunately the gateway ...

Sharing SSL Certificate

I want to buy a wildcard SSL certificate to be used by multiple web servers. Is this possible? If so, what is the configuration? DNS design for [www/nas].example.com: A Record | @ | Shared Web ...

DNS (NSD) zone transfer not working

I'm trying to create a master/slave setup using NSD. I have NSD installed on two servers. The servers are running great; when I perform normal DNS queries they return the information from the zone ...

Unbound - domains cached only for short time

I recently set up Unbound for DNS caching, along with DNScrypt on Linux Mint 18.1. It works, but I noticed the pages are cached only for short time: First query to google.com - 48ms (domain not ...

dig (and other tools) only returning A records

I've been trying to work out why the PHP getmxrr() and checkdnsrr() methods do not return successfully for working domains in a number of vagrant VMs that I use. When looking into this further I ...

Adding root named DNS zone in AD environment

We have a test environment with root AD domain named corp.testdomain.net with AD integrated DNS. For Exchange tests, messaging team has asked if we can create testdomain.net zone on DNS server. Surely ...

Multiple/Overlapping DNS wildcards

for a Domain mydomain.com, I have the following entries: ; Canonical Name definition * 600 IN CNAME www *.staging 600 IN CNAME newdomain.com. www IN CNAME ...

Resolving a CNAME - who looks up subsequent A record - resolver or server?

When a resolver looks up a CNAME, the resolver apparently first sends an A record request to the DNS server. Is the DNS server supposed to figure out that the request is actually for a CNAME, or is ...

Adding conditional forwarding on Windows Server 2008 goes wrong

Since Spamassassin can't query URLs bec. of "URIBL_BLOCKED ADMINISTRATOR NOTICE: The query to URIBL was blocked." I need to configure Windows DNS Server. I tried to follow the steps explained here: ...

OpenDKIM record DNS query works only sometimes, seemingly randomly

My server is modalduality.org and I have a DKIM record at 201703._domainkey.modalduality.org. When I run dig 201703._domainkey.modalduality.org TXT I get back the correct record in the ANSWER ...

Adding both CNAME and TXT DNS records for one subdomain

I have a Heroku app and I need to set up a domain for it. The common way to set it up is to use CNAME record to specify that this domain is an alias to <your-domain-name>.herokuapp.com. The ...

Does the primary dns suffix on our Windows 2008 servers have anything to do with internet connections?

Windows 2008 R2 servers: No Active Directory All servers are WorkGroup members - not domain members No internal DNS servers Single NICs IIS 7.5 Each server has its own Windows SMTP Server These ...

Web Server and VPN on same machine [on hold]

I have a domain, lets call it test.com thats pointing to IP 260.0.0.10, this is my home external ip. On this IP I have an webserver (Wildfly) and an VPN client (AirVPN). My IP on the VPN client is ...

is _ illegal in cname?

We're having trouble creating the long TXT record for the DKIM key on the web interface on our hoster. Each line can only accept 256 characters. We tried multiple lines, then tried adding (" at the ...

Authoritative DNS with forwarding for some domains:

I'm setting up a bind DNS server. Recursion is set to off and I have two zones defined: zone "my_local_private_domain" { type master; file "/etc/named/zones/my_local_private_domain"; }; ...

Servers randomly stop communication with other servers

This is now happening more frequently than I imagined. I have two servers in same location directly connected to ISP, on static provider's IPs. Servers constantly communicate with remote server ...

NS record configuration not working in bind (bind9) on ubuntu

I have following zone file: testzone.local. IN SOA MyUbuntu hostname ( 6 ; Serial 3h ; Refresh after 3 hours ...

DNS: Access hosted servers tied to 3rd party domain instead of HOSTS

We are accessing some hosted servers (ex. dev1.hostco.tld, test1.hosted.tld, prod1.hosted.com, bakdev1.hosted.tld, baktest1.hosted.tld, bakprod1.hosted.tld) across a VPN tunnel, that are tied to the ...

DNS update not visible for http?

My website is hosted by provider A. Due to contractual issues I was forced to move the domain to hoster B. B is the new registrar as well. According to the whois entry the domain was successfully ...

My own nameservers don't work without adding glue records, why?

I don't understand this. Everywhere I read that glue records are only required to prevent circular dependencies, for example I want to set ns1.example.com and ns2.example.com nameservers for the ...

How to set up DNS when connecting to two networks?

I have a linux machine with two network interfaces. They are both connected to local networks -- one is 192.168.*.*, the other is 10.*.*.*. The 192.168.*.* network is completely private and does not ...

How to use Cloudflare CNAME to have a unified DMARC policy?

According to DMARC FAQ it's possible to have a single policy for multiple domains, and that all tools refer to this main policy: How can I put DMARC records on many domains at once? Some ...

windows dns configuration for static IP [on hold]

I'm trying to resolve my computer with a public ip. I have made the following configuration changes to accomplish that: My Router has a static IP. Configured port forwarding to my computer from my ...

i install dns in centos machine but it not resolve ip to name and name to ip

i have some problem regarding DNS. i install DNS in centos 7 machine and my centos machine ip is 192.168.0.155 .if i run nslookup FQDN (centos7.unixmen.local) name then it resolve into ip means my ...

ACL Blocking domains/IPs in pfSense - Is it more efficient to null route from DNS

Starting to fine tune pfSense routers deployed at some businesses and in order to better protect privacy and security we started rolling out blocklists via pfBlockerNG. Loading up lots of lists ...

How can I query all DNS entries known by my DNS server? [closed]

My office relies on a lot of custom DNS entries to store useful information, but the site listing isn't well documented. I'd like to search the network and see what's available that I may not know ...

Removing a AAAA record - is this safe to do?

For our domain we currently have both A and AAAA records configured. We would like to switch the IP to which these records point to. For this purpose, we have purchased a 'dynamic IP' service from ...

postfix dkim=neutral reason=“invalid (public key: missing p= tag)” outgoing email not received

I use postfix to send outgoing emails ... a user does not receive sent posts ... when I sent same to my gmail account post does arrive in inbox ... yet below is what appears on Show Original ...

DNS resolution fails in some countries

I am checking website via wordwide DNS checker. DNS resolution is incorrect in some countries. What is the cause of this problem? No problem in my other websites only this Web site: downvids.net ...

How to configure DNS Zone to use a different IP as Email server?

I used to have my web and email services on the same machine, on the same IP address, so my DNS Zone was relatively simple. Now, I am setting-up 2 separate machines, for Web server, and for Email ...

Wildcard Sub domain to access script [closed]

I am working on a php script. I want to allow my clients to access this script on their own sub domain. Like my domain is domain.com which loads the script. I want clients to update their dns and ...

opendkim-testkey: key not secure, but dnssec is ok

I'm trying to setup opendkim, but I get this result: # opendkim-testkey -vvvv -d my.domain.dom -s 201702 opendkim-testkey: using default configfile /etc/opendkim.conf opendkim-testkey: checking key '...

How did someone point a sub-domain of our domain to someone else's IP address?

We own a primary domain: businessdts.com I didn't know if our admins had created a sub-domain I had requested, "BDASERVER.businessdts.com.", so I just tried to connect to it with a browser and got a ...

How to access a HTTP server using a name instead of the IP [on hold]

The client infrastructure: 1 notebook with Ubuntu as a server, that runs a Rails application on IP 192.168.0.199 port 3000. 1 TPLink Archer C50 router that assigned the IP ending with 199 to the ...

iLO and DNS - how does it work?

How does host name resolution work on a server's iLO port? For example, in case of a HP ProLiant server equipped with iLO, I can access the iLO web interface through a factory-set hostname URL http://...

How do I tell if a site is using CloudFlare reverse proxy services?

I'm investigating the impact of the leak of CloudFlare payload data due to a parser bug on services that we use. It's relatively easy to tell if a service is directing traffic to CloudFlare via DNS: ...
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