DNS stands for the Domain Name System, a hierarchical, distributed database where the keys are domain names.

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Windows server DNS resolves localhost for (some) foreign IPs

I have 2 Windows Server 2008 R2 DNS Servers which share the domain xyz.wan and reside in the 192.168.50.0/24 subnet of my network. Connected via IPSec VPN site-to-site are some other subnets ...
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44 views

Docker debian slow dns resolve

I got terribly slow dns resolve inside my ubuntu when using wget or curl, apt-get,... root@815340a37f0e:/# time curl www.google.com ... real 0m5.132s user 0m0.006s sys 0m0.003s When I do ...
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29 views

my sub domains vanish with time

I have a server running bind9. When the propagation is done and i ping domain.tld i get xx.xx.xx.xx (where xx.xx.xx.xx is the server IP), if i ping test.domain.tld i get xx.xx.xx.xx, at this point ...
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1answer
33 views

Is SPF record necessary for single domain IP?

My question is simply this - I have a domain where all the DNS records to a single box. Do I need to setup an SPF record in this instance as SPF is designed for where a different IP is sending emails ...
3
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0answers
51 views

Big Trouble with (I think) Outlook X500 addressing

I moved a small client from one hosted Exchange server (Microsoft Office 365) to another (Intermedia.net). Some emails from External senders to the users on the new server host are undeliverable, ...
10
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1answer
172 views

Active Directory forest with same name as root DNS zone and browsing to site with same name

Related to this previous question of mine about why it's a bad idea to use the root domain name as your Active Directory forest's name... I have an employer, whom I will refer to as ITcluelessinc, ...
3
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1answer
64 views

How to determine where an IP returned by NSLOOKUP is coming from

We have a Windows 2012 AD environment with two domain controllers. We have a mac workstation which has an IP of 10.8.214.30. It resolves fine and pings fine, but when you do an nslookup you get the ...
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1answer
27 views

DNS format error in syslog, how to debug?

I'm getting an error in my syslog when resolving a domain I also the DNS for. Nov 24 21:51:55 moo named[4075]: DNS format error from 192.227.143.105#53 resolving bostonyoungentrepreneurs.com/NS for ...
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2answers
109 views

Managing IPv6 rDNS

Still very new to IPv6 and I talked to my datacenter and they do not do rDNS for IPv6. Unfortunately we currently do not support rDNS for IPv6 allocations. We can however delegate the IP block ...
2
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0answers
36 views

What does a healthy CNAME to an S3 web access bucket look like? [duplicate]

I have feed.foodschmood.com configured according to Amazon's instructions (a CNAME to one of their endpoints, which is itself a CNAME), but I'm skeptical that this is a "proper" configuration. ...
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2answers
32 views

How do I secure a zone with dlv.isc.org's DLV service? [closed]

I'm setting up domain-lookaside validation. I think I got mostly everything correct. I followed the directions here: https://dlv.isc.org/about/using. I registered my domain and uploaded the key ...
2
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1answer
47 views

Cannot load reverse lookup zones containing “rich-text” PTR records

Summary I am attempting to set up Wide-Area Bonjour (aka DNS-SD) using ISC Bind 9.9.5, but cannot load reverse lookup zones providing discovery of "rich-text" service domains. Background According ...
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1answer
24 views

How to configure an additional BIND instance for a domain already described by other public name servers?

Background I have a small virtual server hosted by my provider and there I have configured a relatively simple combination of postfix, dovecot and roundcubemail (backed by nginx) that works OK. I ...
1
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1answer
48 views

Setup Windows Server Local DNS on WAN

I inherited a WAN with centrally hosted DNS,AD Servers. I have clients connecting to Application Servers hosted locally on site. Problem is when the WAN link goes down clients can't connect to ...
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2answers
75 views

DC keeps losing DNS record

I have multiple DC in the organization with DNS roles installed on them. One of the DCs keeps losing its DNS entry. I flushed dns cache using ipconfig /flushdns I registered the DC using ipconfig ...
0
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1answer
73 views

Setting up sub-domains to point to a single instance Elastic Beanstalk application

I have a multi-tenant application that I've deployed to Elastic Beanstalk. Each tenant has a distinct sub-domain that they access the application from. After I deployed to Elastic Beanstalk I was able ...
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1answer
146 views

Dig shows external configuration? [closed]

I'm already trying for 2 days to deal with an answer for this problem. I have a virtual server somewhere and installed postfix/dovecot/mysql. It works somehow. I can login with Outlook with the ...
2
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1answer
75 views

Windows DNS Server Export

Is there a way or a tool that I can get a csv (or even tab delimited) list of all Forward Lookup Zone records and zones in a Windows 2008 R2 DNS Server? The DNS Server is the built-in Windows one, ...
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0answers
123 views

My domain controller/active directory server can't establish a connection with the global catalog [closed]

I have a Windows Server 2008 R2 running as my domain controller. It is responsible for Active Directory, DNS, and DHCP. It is the only DC in the forest. Active Directory reports errors every hour: ...
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2answers
57 views

MX vs SRV records [closed]

At first sight, it seems that MX and SRV records serve the same purpose. They both: Point a client to the name of the host the server is on Support prioritizing/fallback I'm aware that MX ...
0
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1answer
36 views

Server migration dns doesn't resolve

I have a problem migrating accounts from one server (SERVER_1) to another new (SERVER_2). I have a domain DOMAIN_1 with some NS created on the domain provider (CDmon): ns.DOMAIN_1 pointing to ...
2
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2answers
62 views

Apex ANAME / ALIAS record in Windows Server 2012 R2 DNS Manager

Some DNS hosts offer a way to have an A record that serves an IP address which is determined on-the-fly (or frequently enough via scheduled job) by resolving some other hostname behind the scenes. ...
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1answer
60 views

How should I configure subdomain MX / DNS entries? [duplicate]

I have domain example.com and its mx properly configured. I have also an A entry intranet.example.com which points to my CMS. What I want is to have emails of the form user@intranet.example.com and I ...
2
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4answers
211 views

Detecting duplicate IP address from improperly cloned virtual machines

One of our production servers was "cloned" to make a secondary test environment. The source server is a virtual machine (VMWare vSphere environment) joined to a domain and with a static IP address. ...
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1answer
84 views

gpupdate fails, access denied - event ID 1055

I became aware of this issue yesterday after pushing out GPO for Software Policy Restrictions. I am unable to push out MSI installations to certain computers. I went to look at the one of the ...
2
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1answer
45 views

DNS grey listing and long retry intervals - standard practices?

My company's ISP has implemented what I'll term DNS "grey listing" (or they have a configuration problem) - they are blocking inbound DNS queries between [resolver IP, server IP] pairs that haven't ...
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2answers
52 views

How to limit dynamic DNS updates

First off, I'm sorry if this is vague, but I'm not very familiar with DNS or DNS terminology. What I'm trying to do: I want to limit what hostnames are allowed to dynamically update DNS. I don't ...
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19 views

Registering domain with NIC handle?

Many moons ago I was a system administrator for a small company. I vaguely remember that when I registered domains, they would be using a "handle" which I think was for me "BP897". My previous ...
2
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0answers
87 views

DNS Slave Unresponsive When Master Is Unavailable

I spent several months setting up what I thought was an efficient and best-practice configuration for our organization's DNS infrastructure. DNS1 - master server hosting internal zone files and ...
0
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1answer
52 views

Get a catch-all DNS and set a MX for a special domain

I'm trying to set a catch-all configuration with Bind. I've followed this answer and it works fine : http://serverfault.com/a/397011/179968 Now I'm trying to configure my MX record to configure my ...
2
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3answers
87 views

Is the Reverse PTR record fine

I've checked my email headers at http://mxtoolbox.com which says it is ok. But I'm not sure. MY server's FQDN is host.tariffplansindia.com and for my server's IP( 23.239.30.81) the reverse PTR record ...
2
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1answer
25 views

bind zone file setup for dns round robin

I would like to set up load balancing for my website using DNS round robin. My DNS is managed by my own CentOS 6 server running bind. I added the following into my zone file: @ ...
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1answer
48 views

DNS issue “Nameserver cannot be queried for SOA.” - Eurodns registrar

Recently we purchased a few domains ( on EuroDNS, which we have been using for years), to use as sending domains for emails. Our ESP asked us to point them to their NS. All went smooth for .com and ...
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1answer
180 views

Can I Deploy a batch file with Group Policy to run as administrator?

I have created a batch fill which will block Facebook by amending the hosts file in this location: C:\windows\system32\drivers\etc\hosts This is the contents of the file: @echo off echo ...
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1answer
40 views

SSL Certificate on CNAME

I have been reviewing the other posts regarding the issue, but having some trouble understanding since I've tried implementing it but still not able to figure it out. I have 2 servers. The main ...
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1answer
34 views

DNS configuration for webserver path

What I have is: some vservers and some domains, located at different hosters. A webserver with Port 8081 on one server. I have a path like "123.123.123.123:8081/app/" What I want is: a subdomain ...
3
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1answer
68 views

DNS settings on managed switches in LAN

We have a Windows 2008 server that is connected to a managed switch with about 15 Cat5e connections and three fiber branches that go to different parts of campus. At each of these parts there is ...
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1answer
36 views

DNS settings on computers and switches [duplicate]

Noob questions. I have static IPs on many of my Windows computers in our Windows 2008 domain. In the network settings at each, I have an a static IP and subnet. The default Gateway is set to our ...
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55 views

Internet drops out randomly for short periods of time (LAN issue)

I run a network (I'm just a math teacher) at my school. We get random 10 or so minute periods (I'd guess three a day on average) where the Internet is not accessible from within the LAN. If I go to ...
0
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1answer
40 views

Setting DNS TTL for an external address

To start with, I don't know jack about DNS servers. I have been stuck with resolving a problem with a DNS-Server because I discovered a problem with one of our systems and determined that it was ...
1
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1answer
50 views

Robust and flexible hosting of DNS A records

I'm currently working on a web platform that will be used to power lots of small websites. All of the websites will be hosted on this platform, on either a dedicated or VPS set-up. I don't want to ...
0
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0answers
20 views

geoipdns data update on the fly not working

I install geoipdns recently. It runs fine but it doesn't take new data updates correctly. Data updates should be made without restarting geoipdns, but it's not. I run the update with these steps: cp ...
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47 views

How can I redirect a domain name based on the source Region on Amazon EC2?

I have two web applications, one in Amazon's US-West-1 region and one in the US-East-1 region running on EC2. For the most part, they do the same thing, but they service different customers based on ...
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39 views

301 redirect DNS issues

I think I screwed up something in my DNS configuration and now its bugging me for hours. Any help would be greatly appreciated. I own a domain lets call it abc.com Before all the issues happened ...
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0answers
45 views

Why does RFC 2181 disallow MX record with a CNAME exchange?

According to RFC 2181 http://tools.ietf.org/html/rfc2181#section-10.3 10.3. MX and NS records The domain name used as the value of a NS resource record, or part of the value of a MX ...
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3answers
1k views

How does the HTTP GET method work in relation to DNS protocol?

I am trying to understand application layer protocols in TCP/IP stack. I know that both HTTP and DNS protocol stay at the top layer (Application Layer). So, when a browser wants to access a resource, ...
1
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1answer
71 views

OpenWRT router as a switch with DNS

We have a router (8 ports) that serves our church (it also is our modem with ADSL2 etc) and handles our DHCP services. I've needed to extend our network to accomodate another 2 ports, so an extra ...
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1answer
37 views

Domain has disappeared, but Route 53 and UptimeRobot report it is still fine

I registered a domain with 123-reg.co.uk. It sat there for 2 months and then around the 20th of October I transferred it over to Route 53. I am in the UK btw. The domain arrived at Route 53 on the ...
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2answers
66 views

Name Server with Multiple IPs

We have multiple internet connections attached to my company's network, from different providers, and there are authoritative name servers on the network as well, also with an IP from each of those ...
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1answer
93 views

Too many DNS zones. Need advice on what to do about them

So we have someone here who loves creating DNS zones. So much so that we now have 145 different zones. 80 of these have one A record each. It has gotten to the point where we can't find anything ...