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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16 views

ubuntu only resolves dns when routers ip is present in dns servers list

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
14 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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18 views

Can DNS fail because of a client server configuration?

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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22 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 ...
0
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1answer
27 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 ...
0
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26 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). ...
0
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1answer
28 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 ...
0
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0answers
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
41 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 ...
0
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1answer
34 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
25 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 - ...
2
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2answers
51 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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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 ...
0
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0answers
13 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 ...
0
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0answers
5 views

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 ...
0
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0answers
17 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 ...
0
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1answer
6 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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41 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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0answers
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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0answers
23 views

How can i discover submask and DNS on new lan, using Kali? [closed]

Hello I'm faily new to linux systems and to keep it short, this is my situation. I moved to a college dorm for summer time and we have free internet accesa here, on cable. Problem is the the ISP guys ...
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1answer
36 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
27 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, ...
0
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0answers
10 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 ...
0
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17 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
42 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
125 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
votes
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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18 views

Cannot receive mail but can send mail | Postfix [closed]

I cannot receive email but I can send them. Can't figure out why. This is the mydestination I am using in Postfix's config file. mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain ...
0
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1answer
32 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 ...
0
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2answers
39 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 ...
2
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29 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
58 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 ...
0
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1answer
20 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 ...
1
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1answer
46 views

PC's cant resolve the servers name

we've recently upgraded our server and we've been having an issue where the computers can't find the server without me mapping it's IP in the hosts file. They can find it when I fully qualify it with ...
0
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1answer
36 views

How to add subdomain CNAME alias to other domain subdomain without redirection?

I have two domains, I own both. domain1.com and domain2.com on domain2.com I have a subdomain my.domain2.com which has an A DNS pointing to an nginx. I want other.domain1.com to view content from ...
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0answers
12 views

TLD pointing to subdomain of TLD connected to Heroku

I'm trying to point the root of of domain2.com to a subdomain of domain1.com (which is pointing to a Heroku instance). Do I need to run some kind of reverse proxy for this to work? If so, what kind of ...
0
votes
1answer
34 views

Windows Server DNS Service returns local IP addresses

I have Windows Server running DHCP, DNS AND AD DS. After setting up AD DS and DHCP it was time to set DNS with external IP address. Which is x.x.x.x, domain.eu. DC is obviously name of domain ...
2
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1answer
40 views

is wildcard a record compatible with exchange server

I am the technical lead at a small startup that provides a video library to corporate clients, with a Microsoft (.net/IIS) stack. One of our features is providing each client with its own subdomain ...
3
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0answers
59 views

Why can DNS server not resolve any domain ending in .io?

I have two windows domain controllers. 10.10.10.10 Primary ( win 2008 r2 ) 10.10.10.20 Replica ( win 2012 r2 ) The second one is configured as a replica of the first. About once per week, the ...
0
votes
1answer
39 views

resolv.conf “search” ignored

my /etc/resolv.conf file is quite basic, something like: # Generated by NetworkManager domain subdomain.example.org search subdomain.example.org nameserver 192.0.2.100 nameserver 192.0.2.200 From ...
0
votes
2answers
27 views

DNS server knows authority but does not provide answer

I am trying to connect to an address that is accessible via a VPN. My ISP's DNS server seems to know where the authorities for the domain are, but can't return the answer/IP address. When using the ...
0
votes
1answer
20 views

Bind9 DNS Setup

I have my network set up like this: My question: what is the best approach for setting DNS on this network so that all host (H1, H2 and H3) can resolve each other? It is enough to just have NS1 as ...
1
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1answer
39 views

Differing Internal vs External MX records

The setup: The business runs an internal DNS server not accessible to the public internet. The business's domain is registered with a registrar and the authoritative name servers outside the local ...
0
votes
0answers
19 views

External DNS resolution not consistent in AWS VPC

I have 2 instances in a VPC. The VPC is set up with the correct DHCP option set to enable public DNS resolution. Both instances are identical, and are launched using the same bootstrap scripts and ...
0
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2answers
29 views

nameservers & dns records: how subdomains and emails redirect during server downtime

I'm trying to get my head around how this aspect of my server works and am uncertain I'm understanding it correctly. I'm looking for either confirmation my assumptions below are correct or correction ...
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1answer
25 views

same DNS name internal and external server

My internal domain name with the same name as the external domain. when I'm tying to access to external domain from inside it is working properly with A record but my problem is the external IP ...
0
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2answers
55 views

Delay associated with AAAA request

I have a standalone, isolated network running mixed Windows and Linux systems, with a Windows 2008 R2 server performing AD duties and DNS. I'm seeing 5-second delays with the use of getaddrinfo on ...
0
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1answer
44 views

How to set up a simple docker-contained reverse-proxying (nginx) server?

Technically i shouldn't be asking this question as i was already able to successfully accomplish it, however i did not record any of my notes/findings on it and i was forced to delete the centos VM it ...
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0answers
58 views

Computer Name lookup over PPTP VPN

I have a very small company with just 1 server, a Windows Server 2008 R2, serving as an AD DS, DNS, WINS, DHCP, and now RRAS VPN. Not ideal, but it's what I have. I recently turned on routing and ...