The Domain Name System, usually referred to by the acronym DNS, is a hierarchical, distributed database where the keys are domain names.

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sub-domain and active directory

Trying to build new BIND DNS(non-mircosoft) and create sub-domain since: Let's say, we have too many hosts, and use too much resources on specific domain/name-server, such as example.com. So, we are ...
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22 views

DNS resolves self domain

I have a couple of domains (abc.com, def.com, ... , xyz.com) and I have a dns server (ns1.example.com, ns2.example.com). All my domains use ns1 and ns2 dot example dot com as their name servers. ...
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19 views

Best options for zero-downtime nameserver change if registrar disables URL redirecting?

An organization I work with is beginning to put many of our domains behind Cloudflare, but we have one domain hosted on eNom that is proving difficult to migrate without downtime. Here's the ...
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27 views

Wrong configuration with CNAME & PaaS Provider [duplicate]

I'm new to this new topic of DNS and researched a lot the last days. I bought a domain name and a PaaS server. Now I want to point the domain name to the PaaS Server. The issue is that my ...
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1answer
32 views

Pointing a Sub domain of a host to another Domain [on hold]

I have a host sub domain (ex: sub.domain.com) of Hostgator.com. I want this as the pointing server of a domain of godaddy.com. Which means, when I try to log to the domain.com, it should go to the ...
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1answer
502 views

Why is geo-redundant DNS necessary for small sites?

This is a Canonical Question about DNS geo-redundancy. It's extremely common knowledge that geo-redundant DNS servers located at separate physical locations are highly desirable when providing ...
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1answer
21 views

Bind 9.2 server refuses to resolve CNAME from sub-zone

I've got an old master nameserver running Bind 9.2 and a newer slave running 9.8. Right now we've got a project going on where we're essentially splitting a cloud in two and we're using subzones and ...
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21 views

DNS Server not forwarding requests

I have been working on setting up some VOIP phones for our provider. The phones connect to their provisioning server in order to download the configuration. If I leave the phone as DHCP, it gets our ...
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1answer
23 views

For DNS and SSL do I need a separate certificate for every (DNS RR) A record?

So our firm wants to separate out our cloud servers into separate environments, so www.foo.com, test.foo.com and dev.foo.com. [We may even want to break our subdomains into further sub-domains.] My ...
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1answer
34 views

Remote Desktop will not connect using hostname, DNS issue related to WLAN/LAN switching

We have a set of wireless devices in our directory. While these are connected wirelessly, I can connect Remote Desktop with no problems. The issue is when it's connected directly, the hostname seems ...
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1answer
40 views

Problems with DNS

I'm in charge of the admin of the VPS of the company I'm working. Basically, those VPS host our websites and also serve as name servers for the domain names we purchased. To manage all this, I'm using ...
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2answers
2k views

Some DNS servers in the world giving wrong IP address for our domain?

Our domain, grahamhancock.com is being wrongly resolved by a few people around the world, but it resolves correctly for most people. When I run through a list of free open DNS providers, about 90% ...
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1answer
22 views

Reverse DNS query of public IP returns localhost

I'm seeing this unusual behavior with reverse DNS lookups on this public IP Address: 222.253.228.79. Can someone explain what's going on? MXToolbox PTR lookup resolved localhost as the domain ...
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0answers
16 views

No internet access for client static ip on linux dhcp server

We are using a dhcp server configured with isc-dhcp-server on debian 8 in a small office network. The server has two network adapters one is connected to a pppoe modem and the other is connected to ...
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46 views

AD DC for domain could not be contacted

We are using samba4 on Debian 8 as a AD DC and isc-dhcp on another Debian 8 machine as a DHCP router. The problem is that if I set dhcp ip on a windows client I can't join the domain. If I add the AD ...
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18 views

Configuring bind with Windows DNS

I am trying to configure Bind DNS Server(version 9.8.0) as DNSSec validation recursive server for Windows Server 2008 DNS Server as server 2008 does'nt support RSA-SHA-256 Trust anchors like server ...
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1answer
21 views

DNS entries for AWS Website and GoogleApps Mail

I need some help sorting out my DNS entries. I have a domain, lets say it's somecompany.com Off this domain I have a website on AWS Cloudfront, which should be accessible via www.somecompany.com ...
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21 views

Local DNS resolution fails [closed]

Straight and simple, DNS names do not resolve on my network :c I've tried to troubleshoot this by: Ensuring the DNS and Default Gateway IP addresses on the client machines are the same ...
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0answers
25 views

ubuntu only resolves dns when routers ip is present in dns servers list [on hold]

when i use dns servers other than my routers ip then ubuntu or any other application (web browser) fails to resolve host names. i have added google's dns servers (8.8.8.8, 8.8.4.4) using ubuntu's ...
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1answer
17 views

How to configure a zone transfer from a windows 2008 primary dns server to a CentOS secondary dns server

So my primary dns server is a windows machine and I would like to configure a zone transfer to a secondary dns server that runs CentOS. Both indivdual dns servers were tested and work on their own. ...
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0answers
21 views

Can DNS fail because of a client server configuration? [on hold]

I recently began work in a new environment. The network has many subnets and many nodes with many network engineers who work in the environment. There is a Linux server with Cobbler on it. It has a ...
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25 views

Conditional Forwarder windows 2008 server

I have 2 servers physically separated which I want to establish an Active Directory trust relationship between. For this I need to configure it's DNS server as a conditional forwarder in order to ...
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1answer
30 views

DNS Forward Lookup Zone disappeares on transfer

My Forward Lookup Zones keep disappearing from the DNS servers. I got 2 servers with Active Directory and Domain Conntrollers. As long as the Forward Lookup Zone for the domain dont get replicated ...
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29 views

DNS in windows server 2012 R2 is incorrectly configured

I originally setup my internal DNS server for active directory. I just followed a pretty simple tutorial (i believe at https://www.petri.com/install-active-directory-windows-server-2012-manager). ...
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1answer
29 views

GoogleDomains with AWS

So, for my own amusement I decided to try hosting a server on an Amazon EC2 instance, with GoogleDomains as my DNS registrar (for flexibility). I know there are numerous upsides and downsides to this ...
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8 views

dnsmasq, dynamically add addresses?

Is it possible, with dnsmasq, to dynamically add/remove addresses ? For instance, executing a script from php (it's maybe bad, but theorically, is it possible ?) to add: address=/altern.org/100.2.3.4 ...
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1answer
45 views

Multiple DHCP servers in multiple subnets, one DNS server

I have existing network with two subnets - one is the main company subnet (192.168.1.0/24), the other is completely separate VLAN for Guest Wireless and BYOD devices (192.168.2.0/24). There's Windows ...
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1answer
37 views

DNS record in Server 2012 to resolve own site locally

I have publicly accessible server "abc.example.com" that is physically located in my network. How to add it to my Windows Server 2012-based DNS server to resolve this server for the computers in my ...
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1answer
27 views

Load tomcat application via DNS without typing 8080

I am having a Amazon EC2 Ubuntu instance. I have installed LAMP server and tomcat 7. I also have application running in tomcat. Now, my URL for apache is - ...
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2answers
54 views

What kinds of security vulnerabilities does providing DNSSEC expose?

I was thinking about signing my DNS zone with DNSSEC. My zone, the registrar and my DNS server (BIND9) all support DNSSEC. The only one who doesn't support DNSSEC is my secondary nameserver provider ...
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0answers
20 views

BIND won't start when master server is same as domain name

I am trying to set up nameservers using BIND, and configuring using Webmin. I have created glue records that IntoDNS show have been registered and set up properly. I have a VPS ready with all the ...
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20 views

Dnsmasq , redirect all but google.com

My router uses dnsmasq. In my dnsmasq.conf, I write: address=/#/127.0.0.1 in order to resolv any domain to my local server. It works. Now I'd like to make possible to join www.google.com. Any other ...
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When using VMWare Fusion: DNS lookup on Windows 7 guest appends localdomain [migrated]

Here's what I type: C:\Users>nslookup Default Server: UnKnown Address: 172.16.128.2 > google.com Server: UnKnown Address: 172.16.128.2 Name: google.com.localdomain Addresses: ...
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31 views

changing IP for specific host DNS entry in BIND for dedicated server [duplicate]

changing IP for specific host DNS example (test.com) entry in BIND to point to different IP let say my 2nd dedicated server IP. I have dedicated server hosting on data centre running BIND9, connected ...
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20 views

PING fails for Windows Server 2012 FQN from a client machine

I have a simple network consists of 2 desktop machines configured with the following ethernet settings; Preferred DNS Server is the IpAddress of Windows Server 2012 R2 machine; My desktop ...
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1answer
8 views

When is domain resolved for openvpn server?

In my setup I have several OpenVPN clients pointing to a vpn server's dns name. let's use vpn1.mydomain.com as an example. The server's public IP pointed to by that domain would be for example ...
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44 views

DNS round-robin requests not distributed evenly

We have setup two DNS A records, where each points to a load balancer. nslookup ourdomain.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: ourdomain.com Address: ...
3
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37 views

Why does dig +trace seem to ignore the DNS glue records?

Here are my questions: Why does dig +trace ignore the Glue Records? Is this behavior specific to dig or dig +trace, or does a recursive name server also "manually verify" glue records it receives? ...
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1answer
43 views

Using dnsmasq to service multiple subnets

I'm pretty new to using dnsmasq, and I would like to keep utilizing it in my lab environment. However, being new, I am unsure what commands/files to use. I've spent two days doing research and ...
1
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1answer
29 views

Bind9 and different zone locations

I'm just trying to get a DNS server off the ground and most of the guides I followed online tells me to create zone files in /etc/bind/zones or just /etc/bind/. But I want to use a different path, ...
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0answers
12 views

rendom /upload Failed

I am attempting to rename a domain in Azure IaaS. I have been moving through the rendom process, but at the rendom /uplopad command it fails with the following: The system cannot open the device or ...
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18 views

Bizarre routing table name resolution issue with openvpn

I have been having some rather odd issues with my routing table. I am running a Debian Wheezy system, and for a while now, whenever I connect to my home wireless network AND my VPN server, (but not ...
2
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2answers
43 views

dns a records become static

So here's a weird one... I'm managing a Windows AD environment. For whatever reason, when it was built, DNS was not integrated with AD. A month or so ago I went ahead and integrated DNS with AD ...
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1answer
132 views

BIND dns high performance caching

I'm running bind on a small server used for resolving lots of domains, my main goal is fast resolving of domains and low memory usage. I want to use something like local zone with the nameservers of ...
0
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1answer
29 views

MX Record Failover When Primary ISP down

I need some help to configure ISP Fail-over. I have configured a Zimbra Mail Server on CentOS. It is working fine. We have 2 ISP connections and created 2 MX records for both ISP's like bellow ...
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1answer
33 views

How to host staging and production on the same server [closed]

I'm new to server administration and I've recently setup my rails app on a Linode server. I followed a similar configuration to the Ryan Bates railscast on the subject. With nginx, unicorn and Ubuntu ...
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2answers
42 views

smtp blues - external emails works, internal does not

I have 3 domains hosted on a remote server, but I am using other postfix server for SMTP only. So, I have two servers: mail.domain1.com - remote mail server, storing mailboxes and used for IMAP ...
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1answer
40 views

Server “shows signs of being infected” - how to resolve email blacklisting

I help manage 178.32.51.182 and noticed we were getting bounced emails because of several blacklists those are: CBL FABELSOURCES Spamhaus ZEN so I checked the first blacklist here: ...
2
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2answers
62 views

How to point multiple top domains to IP of another top domain?

Lets say I have top domain domain-X.com with DNS A record pointing it to IP 1.2.3.4 then I have domains, which I might not have control over, they belong to customers, which owns them and may ...
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1answer
21 views

UTF8 in named.conf bind

I have a zone file that looks like this: فلسطين. 172800 IN NS idn.pnina.ps. فلسطين. 172800 IN NS ns1.pnina.ps. فلسطين. 172800 IN NS ...