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

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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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22 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
23 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
38 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, ...
8
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1answer
105 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, ...
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21 views

Can somebody guide me about DMARC report [on hold]

If you can see in image, Part 1. My settings in DNS configuration. Part 2. DMARC Digest. Can somebody guide me about the red marked thing. Why it has passed DKIM ? and Why 40 trusted source when I ...
2
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1answer
47 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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0answers
20 views

DNS NSLOOKUP Comment Issue [on hold]

I have build test DNS server on VMware machine and connected 2 clients. When i insert nslookup comment on client system i cannot get DNS server name. Might be its not resolving DNS server name or ...
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1answer
20 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
98 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
35 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
27 views

Require help of finding issue with DNS, NAT or NS [on hold]

Before giving you the problem let me try to explain the network - Server is directory connected to a physical firewall and internet service is coming to firewall. Firewall has a static IP and from ...
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2answers
28 views

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

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 ...
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0answers
18 views

windows server 2012 ping resolves every time 169.254 [on hold]

i have a static 192.168.1.254/24 on my windows server 2012, it's a domain controller and is a A-host DNS server_a 192.168.1.254, when i ping to server_a every time resolves 169.254.222.88 but when i ...
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1answer
38 views

Mismatch of IP Address in our linux machines? [on hold]

I have few Ubuntu machines in which I have our app servers running which is trying to connect to another set of RHEL machines in which I have our Cassandra cluster running. Now as I said, my app ...
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0answers
18 views

cPanel “Addon Domain” with Route 53 [on hold]

Ok, So I've bought a domain on namecheap.com, and I've set up the DNS to point to Amazons Route 53. At that point I did not need to host any web pages. All I needed the domain for was emails. So I ...
2
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1answer
30 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
25 views

Ubuntu 14.04 Server: Use STATIC DNS servers [on hold]

How can I disable DHCP nameservers in Ubuntu 14.04? I have 2 Ipv4 and 2 Ipv6 nameservers which I want to use, but resolvconf only generates a file with nameservers from my hoster because the server ...
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1answer
23 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 ...
0
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1answer
27 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
42 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 ...
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0answers
24 views
+100

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
83 views

Dig shows external configuration? [on hold]

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
votes
1answer
59 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
78 views

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

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
51 views

MX vs SRV records [on hold]

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 ...
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0answers
12 views

Cant resolve dns when has same domain of server in browser [duplicate]

i have just setup a DC running 2008 R2 my domain is tingateitsolutions.com.au and have setup my dc using that domain i just setup DNS with a forwarder to my router 192.168.1.1 and also 8.8.8.8 i ...
0
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1answer
33 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 ...
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1answer
35 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. ...
-1
votes
1answer
42 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
172 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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29 views

Local DNS Server [closed]

I am working on a tool that provides 'global virtual host/VPN' configuration for a LAN. Say I have some domain, mylan.example.com, that points to my router at home. I have a number of machines, alpha, ...
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1answer
39 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
votes
1answer
35 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 ...
1
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2answers
42 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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0answers
10 views

Multiple Emails From Different Server [closed]

I've an issue that I hope anybody here could help me. 1.I have a domain that bought from domain registrar. 2.After that, I purchase a web-hosting with email plan from other provider and have been ...
0
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0answers
18 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
65 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
35 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
votes
3answers
82 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 ...
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0answers
4 views

wget is unable to resolve host address 80% of the time [migrated]

I have a wget 'http://xxxx.net/somepage.asp?params@abc' in a bash file. When I run it, four out of five times it says: Resolving xxxx.net (xxxx.net)... failed: No address associated with hostname. ...
2
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1answer
18 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: @ ...
-1
votes
0answers
16 views

BIND providing recursion when it shouldn't [closed]

I have an installation of bind9 running on Ubuntu 12.04.5 LTS. I use this to run split DNS (pointing my internal server names to local IPs rather than external IPs). When I query an internal FQDN ...
0
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1answer
34 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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0answers
14 views

BIND forwarders working but not root servers

I took a system with an old version of Fedora on it and bare metal loaded Fedora 20. I used the KDE install option and then added Bind via KPACKAGEKIT. After adding a local zone it could resolve my ...
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1answer
50 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
30 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 ...
2
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1answer
58 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
32 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 ...