Newest 'domain-name-system' Questions

Q&A for system and network administrators

Is it possible to serve a website on a TLD? [closed]

I have never seen a website hosted on a TLD (for example: http://com or http://ru) Is this even possible?

Windows Server conditional forwarders does not work on one of the domain controllers

With few words, the problem is that few domain names are not resolved by workstations in our network, while doing it from Remote Desktop session on the server succeeds. Now the details. We have a ...

Cannot ping DNS servers

I'm in abit of a situation, here is what I'm up against: So I have two server, on different subnets. Both servers can ping each other. Server one 10.0.1.* Server two 192.168.2.* Server one can ...

GUI for PowerDNS with GeoIP?

I'm looking into using PowerDNS to load-balance between a few (nginx proxy) servers located in different places globally, by providing a DNS response using an IP situated more locally to the user. I'd ...

Windows DNS address list doesn't fall back

I've set up my own DNS server (Bind9) on a Pine64 running Ubuntu. On my Windows 10 computer, I've added the IP-address of my DNS to the top of the DNS server addresses in the Advanced TCP/IP Settings. ...

Postfix - Slow sending, duplicate sending

We recently moved offices, and thus changed our public IPs for our Postfix mail server, and I'm now experiencing some very strange behaviour. The server will work fine for 24 hours or so, but then it ...

OpenVPN Client connects, but DNS setting are not correct (cannot resolve domain names)

I've an active subscription with VPNUnlimited, and they have sent a few settings in order to be able to use OpenVPN client with their service. (they have sent me pre-made .ovpn files for each of their ...

DHCP scope static routes lost when updating network adapter

When enabling 'use this connection's DNS suffix in DNS registration' locally on a machine (Server 2012 VM) for dynamic DNS updates, the classless static routes configured from a DHCP scope (from 2008 ...

AWS EC2 setup and DNS

I just created a new site within EC2, the site works fine if I go to it's public IP. However I am setting up this site as a subdomain for another site, e.g. subdomain.mymarketingcompany.com. The main ...

Why do Name Servers need to be FQDNs? Or do they? [duplicate]

Background: Im working on a self hosted DNS server project. I currently host my own email and web servers but have left the DNS service up to my domain registrar, GoDaddy, since they provide it for ...

SPF ip4 record for servers in auto scaling group?

I have a set of servers in an ASG behind a load balancer on AWS that are all capable of sending emails. The problem is I need to authorize an IP in our DNS SPF record in order to keep emails from ...

same entry for CNAME and sub-domain

SRV Record: _xmpp-server._tcp.meet.domain.com => target=server-name.domain.com (A Record) CNAME: meet.domain.com => target=server-name.domain.com (A record) As you can see, the word "meet" already a ...

Microsoft DNS : SRV record for sub-domain without creating a new zone

On Microsoft DNS server (Windows Server 2012): We have a DNS Zone for domain.com We need to create the following SRV record: _xmpp-server._tcp.child.domain.com => target is = host.domain.com Can we ...

Point domain to sub domain of another site [closed]

How can I point a domain to sub domain of another site? (I've read a few related posts on the interwebs but none had the answer) So basically if a customer named billy creates an account on my site. ...

How long does it take to update TTL (Time To Live) of a domain

Say my domain example.com has TTL set to 86400. If i change this through the registrars' panel to 60 when will this change take place? Will it need 86400 seconds ? or will it be instant? I cant find ...

How to Push DNS Propagation [closed]

I migrated DNS Nameservers from old to new 1 month ago but still on some local internet providers it shows old DNS information. According to whatsmydns.net it's propagated properly but some service ...

Has my ISP mangled my DNS reverse lookup record for a single static IP address?

I've taken on the task of running a small email server, and the world of spam makes it more challenging for an individual, as many MTAs are highly paranoid about accepting email. I think I've ...

Unable to Join domain, unable to resolve hostname

I'm having problems connecting a computer to the domain. I'll explain my setup (with hostnames). I have: Hyper-V Guest 1 (Imperium) - DC / DNS Server (Server 2016 Essentials) Hyper-V Guest 2 (Lima) ...

Unbound refuses requests from localhost even though `access-control: 127.0.0.1 allow_snoop`

This is my unbound.conf server: interface: 0.0.0.0 access-control: 10.0.0.0/8 allow_snoop access-control: 127.0.0.1 allow_snoop access-control: 192.168.0.0/16 allow_snoop ... Reading the ...

How to make Samba4 Internal DNS resolve names without domain [duplicate]

I have a Samba4 AD-DC configured with internal DNS. I followed the configuration at https://wiki.samba.org/index.php/Setting_up_Samba_as_an_Active_Directory_Domain_Controller I use this samba as my ...

Dangers of non-registered (IANA) TLD [closed]

I wanted to register a domain for myself to start a blog, and right after I was about to register it, I found out there are tons of ways to name a Domain (ccTLD, gTLD, sTLD, uTLD, SLD) and to hack it. ...

SMTP name too long for Canon

I am setting up a Canon iR device to scan to email, but their field name for SMTP server is too short for my MX record address. Is there a way to set-up an alias that would work round this, or some ...

WHy is tracert working even though I changed my DNS settings to use a bad nameserver?

In my Network Settings in Windows, I've set my DNS settings to use addresses 192.168.2.239 and 192.168.2.238. These are both non-existing DNS servers. In cmd if I do nslookup www.google.com I get ...

How to best setup a simple route between two datacenters using dns, nat, and vpn?

The goal: Setup two routes with DNS records, between two data centers with 1 behind a NAT. Where data center Alpha can reach any IP in Beta, but data center Beta can only reach Alpha by going though ...

Return A records but not AAAA records on specific domain in bind9

I've setup a caching DNS server with bind9 using a root-hints method (like this). It works as desired--but, our IPv6 traffic goes through a gateway outside of my country that makes Netflix think we're ...

BIND - Slow Query Responses Isolated To Single Interface

Currently experiencing slow query responses on a specific interface on my nameserver. I'm running BIND on a physical server with one network card. This network card is leveraged by the interface eth0, ...

Windows Server 2012R2 Cannot access Websites Locally

We have recently migrated across to new 2012 R2 Servers and we now cannot access websites set up on the server IIS locally on the server, they work fine externally. This is something we need to allow. ...

Local DNS lookup always fails first time

On a very small number of Windows 10 machines at my work we have an issue where lookup of local domain names always fail to be resolved, but only for the first request. The following is the output ...

Google Cloud DNS - What does the PTR record actually do?

In my business, my physical sever has an external IP of 123.123.123.123. Performing a reverse lookup on that IP will give you mail.myserver.com. I had to ask my web host to create that PTR record for ...

Different records at different Nameservers

At my domains registrar I have set up two name servers. They look like this: NS1: xx123456.ip-11-111-111.eu. NS2: ns1.XX.net. I know that first one is quite strange but I cannot do anything about ...

How to DNS Fallback if host not resolvable

For a few docker containers I need a link between containers. This is done by docker-compose and works like a charm if (and that is sometimes the problem) the container is up. I am looking for a ...

What triggers the usage of the negative time to live DNS SOA record value?

I'm reading through the following dns tutorial and it has this example in it: domain.com. IN SOA ns1.domain.com. admin.domain.com. ( 12083 ; serial number ...

azure app service custom domain with godaddy issues

I have 3 azure app services that I need to map to 3 subdomains of our root domain. I've done similar things in the past without issue but I've not managed to get this to work. I used the docs and ...

CNAME working - but not for directories

I'm currently trying to resolve a problem with getting a domain pointed onto another domain, but for some reason it isn't working as it should be - any help here would be fantastic. The CNAME as been ...

Windows DNS NS record TTL

When editing a zone's NS records the TTL fields is always shown empty. Examining the zone DNS file shows that the NS records may already have a value but it is not getting displayed. I have noticed ...

dnsmasq not caching for non-public dns servers

I tried to configure my dnsmasq to forward requests to different dns servers depending on the domain. server=/a.example.org/192.168.a.a server=/b.example.org/b.b.b.b server=/c.example.org/8.8....

DNS in ubuntu server 16.04 can't ping google but its IP

I just installed Ubuntu Server 16.04 on VMware (with bridge network with a static IP, following this tutorial) and can't resolve domain names. When trying to ping google.com, it returns ping: ...

DNS conflict with Exchange mail server

We have a client whose website we host, and it is creating a conflict with their Exchange mail server. Exchange's Autodiscover URL is reporting back the wrong IP. The URL in question is https://...

Virtual host for combined old/new site with shared subdomains?

We've recently created a new "main website" that consolidates two older sites, and need to do some final DNS and Apache configuration work for each of the old ones. (To clarify for some, this is a ...

Set Multiple IP Addresses For DHCP Option 6 DNS Server Using Netsh

I am trying to set two IP addresses for option 6 DNS server using this code: $serverIpAddress = '11.12.13.14' $subnet = '11.12.43.33' $value = '11.12.74.21,11.12.74.22' netsh dhcp Server $...

Duplicate Ping Responses from single AD Domain Controller

Something I can't wrap my head around is happening with a DC on our network. I am a programmer by trade not a network engineer, but I am 99% sure this is not normal behavior. Anyway when I rebooted ...

How to map a hostname to IP with custom logic?

I need to resolve hostnames with the next logic: r0z0n0 10.0.0.0 r10z15n120 10.10.15.120 r255z255n255 10.255.255.255 and so on. I don't want to have 16,581,375 records. It is better to use a ...

When VPN tunnel fails between primary Domain Controller and secondary DC - What happens?

I'm a little unclear as to what happens when a VPN tunnel fails between a primary and secondary Domain controller for an extended period of time. Here is a basic rundown of our environment. We have ...

Google Cloud DNS - add a CNAME to another domain?

I can't add a CNAME to another domain - why and how can I fix? My zone name is myapp.com. To add automated email security re spam, SendGrid (provider) wants me to add 3 CNAME records of the format: ...

setting up a re-direction server [closed]

I need to setup a webserver (on a local ubuntu based platform) that can re-direct from a non-www domain (eg. example.com) to secure subdomain (https://www.example.com). The website itself is hosted ...

Powershell script to find and delete DNS records across multiple zones

We have multiple DNS zones, and what to find static DNS records that no longer respond to pings and delete them. I've written a PS script, but I'm having two problems. 1 - test-connection fails ...

subdomain pointing to i.p address

I created subdomain in go daddy account, and I pointed to i.p address of GCE google cloud computing engine. In DNS Management, I click add button type = A host = nameofsubdomain // point to = i.p ...

Sending but not receiving mails(centOs, postfix) - Probably dns issue

The error message: Delivery to the following recipient has been delayed: contato@domain.com Message will be retried for 1 more day(s) Technical details of temporary failure: DNS Error: 353969976 ...

Amazon load balancing with my own domain

I am trying to use virtual servers (instances) on Amazon EC2. I can assign (elastic) IP addresses to those instances and then assign my domain name to that IP. However, I plan to use a load ...

Email to AOL from Bluehost.com

I have a domain hosted at Bluehost.com, and email forwards are not making it to aol.com users. DNS and MX records are configured per Bluehost's instructions. Bluehost has assigned me an IP Address. ...
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