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

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68 views

How to restrict the TCP listening address of a Windows 2003 AD DNS server

I have a Windows 2003 AD integrated DNS server which I want to listen for DNS traffic on adapter IP addresses only. I have followed the steps in the technet article, however. After I complete them ...
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3answers
70 views

Switching hosting from GoDaddy to AWS

For the longest time, I've had GoDaddy host my website. I have a domain name that has been registered with GoDaddy and is currently hosted with them. I read this article and created a new hosted zone ...
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2answers
41 views

Error sending emails from a mail server relay type falling into the spam folder (using postfix)

Here I show one of the emails that come to Yahoo, which are falling directly into SPAM folder. The SPF goes smoothly, the DKIM passes without problem, even DMARK passes without problem, but just keep ...
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1answer
98 views

nxdomain - host not found

I have 2 domains in the same server(Linux). (The ip addresses are only examples) server: 192.168.1.20 domain1: server1.example.com domain2: server2.example.com cat /etc/resolv.conf # ...
2
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1answer
33 views

nast.denic.de denies nameserver with code 106

I've got the following bind9 configuration and seem not to be able to find the source of nast.denic.de's problem on that: @ IN SOA ns.ggkthx.eu. admin.ggkthx.eu. ( 2014070809 ; serial ...
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1answer
57 views

DNS not resolving for some ISPs

I'm working with an organization that is having trouble with its DNS server. They're running an old CentOS install with an old Bind 9. They're hosting their own DNS, but some queries are failing. I ...
0
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1answer
46 views

force use primary DNS?

we have an Internal DNS Server(172.16.1.1) and there is a AAA record aaa.domain.com --> 192.168.1.100 when I set ip configuration to: Primary DNS Server: 172.16.1.1 Secondary DNS Server:8.8.8.8 ...
3
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2answers
90 views

how to get hosts to call secondary DNS quickly

I'm doing planned maintenance and need to shut down a primary DNS host. since my hosts do host lookups for LDAP commands, when I shut this service down, it takes forever (minutes) before the host ...
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0answers
32 views

Restrict DNS Resolver to specific IP Ranges

I'm running a Windows Server 2012 R2 for DNS. Is it possible, to allow normal DNS Requests for everyone whilst restricting the Resolver Service to a specific range of IPs? We tried it with the ...
0
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1answer
193 views

Reverse DNS does not match SMTP Banner

We are using postfix on centos as a mail server to send out newsletters. but in the mail log file I can see that many receivers rejected our newsletters. and with the help of mxtoolbox, I found a ...
0
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1answer
50 views

Unable to make DNS SPF pass for my domain

I've placed this TXT record in the DNS for domain : admissioncourses.com : v=spf1 a mx mx:mail.admissioncourses.com ~all Ideally all I want is that only email sent from admissioncourses.com( and ...
0
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2answers
103 views

Amazon Route53: Extremely long ns lookup time

I had some failing API calls in a mobile client. In order to investigate, I followed Joseph Scott's advice and executed curl with a few debugging parameters: The results from the Amazon EC2 server: ...
0
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1answer
42 views

Suggestions required for Internal DNS

I'm setting up new server environment consist of 70+ servers all running Linux (Redhat/CentOS mixed.) I want to setup a couple of DNS server (primary/secondary) to be used/configured on all servers ...
0
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1answer
16 views

Supporting writes on bind9 failover

I want to set up a redundant DNS based on Bind9, including failover for write operations. I have DHCP dynamically update DNS based on client hostnames, and I need this functionality to continue to ...
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votes
1answer
35 views

DNS subdomain ip's

For example, I have domain a.com with a lot of subdomains on the same ip. I configured DNS A-recors like this: @.a.com. A 1.1.1.1 *.a.com. A 1.1.1.1 So, a.com and a lot of subdomains are delegated ...
3
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1answer
62 views

Setting up DNS forward zone when AD domain name is a subdomain [closed]

I'm in high school and want to learn about system administration, so I set up a Windows Server 2012 R2 domain controller in a lab and created the domain ad.foo.com. I own foo.com and the domain ...
5
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1answer
41 views

Which domains list my server in their glue records?

My DNS server used to be the DNS server for a company's domain. However they moved elsewhere. Oddly enough, years later they were still listing my DNS server in their whois record (or, more ...
0
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2answers
73 views

Accidentally disabled Local and Remote Access to Windows Server 2008

I have my DNS, DHCP server and site configured on the same server. I was about to block the remote access but accidentally disabled the local access also to the server. I am not able to login to the ...
0
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0answers
9 views

configure custom-urls on openshift using go daddy registered domain [duplicate]

I have a wordpress app that is running perfectly on the free openshift server (blog-abc.rhcloud.com). Everything was working fine until I decided to buy a domain name for my blog. So I bought some ...
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votes
2answers
69 views

DNS Records move web server keeping Email server as is [duplicate]

I have an existing working physical server serving up web pages and email. I need to point the DNS records to a new physical server for the web pages, leaving the email server as is. I have my DNS ...
0
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3answers
57 views

Is there any way to force a refresh on a DNS server?

I manage several websites, servers and domains and we recently migrated our DNS server after an emergency. Now some domains have their NS servers pointing to the wrong IP according to some (Internet) ...
4
votes
3answers
113 views

Website high availability without load-balancer?

I'm considering options for changing a 'high availability' website that provides a service via an https api. The current setup is: Two self-contained VMs, from different cloud providers (AWS and ...
2
votes
1answer
56 views

Domain keeps going back and forth between old and new hosting service

I moved my domain yesterday from Heroku to DigitalOcean. The process went fine and the website seemed to be working fine on DigitalOcean. Today morning I noticed this error when I tried to access my ...
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2answers
213 views

DNS resolution on Windows Server 2012 running Hyper-V

The problem shows as follows: Ping hostname <-- the host answers, it seems like the resolve is done over netbios nslookup hostname <-- hostname wasn't found by UnKnown: No response from ...
8
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1answer
114 views

Is there an official limit to nameserver indirection?

Glue records are typically unavailable if a domain and its nameserver don't share a TLD, and technically aren't required if they don't share the same second-level domain, which could lead to extra ...
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1answer
52 views

A-Record to point to hosting vs. changing DNS while keeping the mail externally

I currently am dealing with a client whose e-mail is hosted on Google. We are just in the process of taking over their domain, but their current hosting company suggests a different set up than I do ...
6
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3answers
255 views

Having trouble with DNS MX records

I've been reading this: http://www.zytrax.com/books/dns/ch8/mx.html For MX records, and I've setup my nameserver via bind. Here is my zonefile for my website: $TTL 86400 @ IN SOA ns1 root ( ...
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votes
2answers
64 views

the name of name server

I used Robtex.com for an online DNS analysis, I'm confused about the meaning of "the name of name server" for the domain name "some_domain.com" robtex returns "The names of name servers are" : ...
0
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1answer
53 views

Issue with www DNS resolution in Route 53

I'm a new sysadmin attempting to set up a series of sites that rewrite the non-www versions of their URLs to the www versions. I know this is a topic that has been beaten to death, but I've scoured ...
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2answers
50 views

DNS CNAME infinite recursion

DNS can handle recursions in CNAME fields. But I was just wondering what would happen if I do something like this, when configuring the DNS for the example.com domain: a IN CNAME ...
1
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1answer
91 views

Should DNS A timeout to result in permanent email failure?

Occasionally an email does not get through when sent to a recipient who uses the outlook.com system for their email server. Their MX record resolves fine, but their A record (something like ...
0
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1answer
41 views

Reverse DNS zones, are they gluable?

Our DNS infrastructure is a bit fractured. We have multiple separate DNS servers for different parts of the company. However, we do still have some interchange issues. Right now a server from ...
0
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1answer
55 views

Finding valid email service providers in a large list of domains

I have a list of approximately 13K free email/webmail providers from circa 2000. Obviously the vast majority of these services have gone out of business, and the domains have either lapsed, or been ...
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1answer
32 views

redirect to specific port without apache

I'm running a few small web applications listening on different ports... 8787, 8888, & 8000. None of them are apache though. Is there any way via either DNS or iptables, or some other way, that I ...
0
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1answer
70 views

How to access atomia DNS web app over public IP?

After installing everything and trying to access Atomia DNS's web app over public IP/port, I get "This webpage is not available". In the guide they access the web app over http://localhost:5380 but I ...
2
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2answers
59 views

Definition of Fully qualified domain name

I tried to search to Internet for a definition of a FQDN. Wikipedia says, a FQDN specifies its exact location in the tree hierarchy of the Domain Name System (DNS) I would interpret this, that ...
1
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1answer
56 views

DNS caching for a DNS name with two different IP addresses (internal vs. external)

Suppose we have a DNS entry ocean.corp.tld internally pointing to an internal IP address on our corporate network, and externally pointing to an external public IP address. Essentially same DNS name ...
0
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1answer
77 views

Nginx, second subdomain not working

I used the CNAME wild card DNS entry like: @ IN A ip.add.re.ss www IN CNAME @ * IN CNAME @ My root domain.com and sub1.domain.com are accessible (on the same digitalocean ...
0
votes
1answer
127 views

tcpdump: “ethertype Unknown”?

While debugging a DNS problem (apparently UDP packets get lost on the network), I'm stumbling upon many (but not all) "ethertype Unknown" messages such as follows. Tcpdump is run with "-n -i any port ...
0
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2answers
82 views

CNAME in @ (BIND) [duplicate]

Can I put something like this in my .zone file? @ IN CNAME srvr-01.foo.bar. Or is that invalid? If it's invalid, how can I redirect visitors from mydomain.com to the server ...
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0answers
29 views

How to send dynamic update to DNS Server using Avahi?

I am using beaglebone running avahi-daemon and I have configure it to respond mdns query with local name “myboard.local” when accessed from PC on same network. It works fine. But, how can I ...
0
votes
1answer
48 views

Delegation not found at parent after pointing A record to different server for subdomain

I have a subdomain dramarsarin.crimsonandcyan.com which i wanted to point to another server. I added an A record in the zone file for crimsonandcyan.com with the host 'dramarsarin' and pointed it to ...
0
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0answers
40 views

DNS: Wildcard Subdomain with exempt subdomains

I have domain example.com. I have a static cdn subdomain where I want to serve all my static files from called scdn.example.com. I want all wildcard subdomains to be redirected to example.com. Is this ...
0
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0answers
54 views

Access switch on the LAN from a WLAN connection Sonicwall TZ205

I have a setup like the following Modem >>> Sonicwall TZ205 >>>> Linksys 8 port smart POE switch >>>> Linksys LRT224 When I am on the LAN through a wired connection ...
2
votes
4answers
441 views

DNS A record pointing to private IP address [duplicate]

I own a domain. I will call it example.com. I want to set up a local BIND server on my private network. I have a box with the private IP address of 192.168.2.13 I would like to have this box named ...
-1
votes
1answer
46 views

Merge three DNS Servers into one [closed]

The situation is as follows: Currently three DNS servers are separated from each other, these are to be merged into one. The goal is to have only one DNS server that handles all requests of the three ...
0
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1answer
200 views

BIND 9.8.2 not giving A record for “dig domain.xxx ANY”

I got problem with my BIND 9.8.2 setup. After configuring master zone which works fine I've noticed that I cannot get a list of all A records using the dig utility with the ANY option. Here are some ...
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1answer
34 views

www and no www duplicate versions of the site? [closed]

So I am having an issue where on my webserver if you go to wwww.mydomain.com it works and displays the website, but if you go to mydomain.com it doesn't change or redirect you to www.mydomain.com, so ...
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3answers
76 views

Show a 503 error page if server unavailable

I've searched through google, stackoverflow and serverfault but I'm not quite sure how to phrase what I'm looking for, sorry if this is a duplicate (it probably is)! What I would like to know is if ...
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3answers
110 views

DNS A records updated 3 days ago - new ip not updating

As mentioned in the title I have instructed my client to update their DNS A records to point to my new server IP 3 days ago. The domain registrar is Heart Internet and the client has provided me with ...