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

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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
votes
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 ...
-2
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
votes
1answer
60 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
votes
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
votes
2answers
72 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
votes
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 ...
-2
votes
2answers
68 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
votes
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
51 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 ...
1
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2answers
200 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
votes
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 ...
-1
votes
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
votes
3answers
253 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 ( ...
-5
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
votes
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 ...
1
vote
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
vote
1answer
90 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
votes
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
votes
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 ...
1
vote
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
votes
1answer
69 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
votes
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
vote
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
votes
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
119 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
votes
2answers
81 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 ...
1
vote
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
47 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
votes
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
53 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
428 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
votes
1answer
193 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 ...
-1
votes
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 ...
0
votes
3answers
73 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 ...
1
vote
3answers
108 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 ...
-6
votes
1answer
89 views

CentOS, ZPanel and Cloudflare DNS error [closed]

I am stuck in a problem. I have a VPS which gave me a dedicated IPv6 address and a shared IPv4 address. I have tunneled it and installed ZPanel on my centOS server. Now I can access ZPanel from ...
0
votes
2answers
43 views

SPF with a Mail Gateway: do I need to put all my mail servers?

I always put all my Mail Servers in SPF declarations, but I'm not sure if this is the correct way to implement SPF. All my mail got routed through a Mail Gateway. Everything goes first to this server ...
3
votes
2answers
249 views

dig & nslookup can't resolve local hosts unless I specify the (local) DNS server to use

I am setting up a small private network within my University network. I have a Centos 6 box (sun) sitting between my private network and the university WAN. eth0 on the sun is connected to the WAN and ...
-2
votes
2answers
34 views

Is this the best way to handle this subdomain issue? [closed]

I have a domain called mydomain.com on server1/IP1. I need to put the subdomain store.mydomain.com on server2/IP2. Am I right I need to add a new DNS A record for the subdomain at the domain ...
0
votes
0answers
123 views

ISPConfig multi-server DNS setup

I have 2 servers with ISPConfig 3 installed. Both servers are used to all services (hosting, db, mail, dns etc). One of the servers is also configured to be ns1.mydomain.com and the secondary is ...
1
vote
0answers
20 views

configure DNS to access local servers using public address [duplicate]

I have a domain and DNS server set up using Windows Server 2012 R2. The local domain is a subdomain of my public one, and I have a forward lookup zone configured for it in my DNS server. i.e. ...
1
vote
2answers
50 views

Local DNS fails when another interface is connected

I have a LAN with a Linux server running BIND for addressing of local computers. When a workstation is connected to the local network (where there is no Internet access), I can successfully address ...
-2
votes
1answer
55 views

DNS hierarchy with bind [closed]

I'm doing a project from class in which I want to simulate a dns hierarchy that works as the global internet dns hierarchy. The structure is like this: Hierarchy So all the requests will be sent to ...
0
votes
1answer
63 views

Apache / Tomcat AJP DNS failures when tunneling

I have a situation where I can access a private NAT-ed apache2.4 / tomcat7.0 railo4.2 server directly from the host or local network but when tunneling in through an SSH remote port forward the ...
1
vote
1answer
38 views

MS DNS conditional name resolution

I have a network with a lot of different subnets and VLANS. Some are specialized server zones, other are for clients or simple transit subnets. We use MS Active Directory, MS DHCP and MS DNS which all ...
0
votes
1answer
33 views

Ubuntu Apache2 server appears to reject a certain domain name

I am using a Apache2 installed on Ubuntu 13.04 Raring Ringtail to host a small wallpapers website. Originally I used osgwallpapers.servepics.com from no-ip.com for my domain name. Now I'm trying to ...