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Questions tagged [domain-name-system]

The Domain Name System, usually referred to by the acronym DNS, is a hierarchical, distributed database where the keys are domain names. Questions involving publicly accessible domains should include the real, Fully Qualified Domain Name (FQDN)

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

The primary references are:

  • RFC 1034 - Domain Names - Concepts and Facilities
  • RFC 1035 - Domain Names - Implementation and Specification

These documents collectively form STD 13. RFC 2181 is a frequently cited reference for STD 13 that addresses some of the more confusing areas of operation.

The most common record types found in the DNS are:

  • "A" records - the mapping from a domain name to an IPv4 address
  • "AAAA" records - the mapping from a domain name to an IPv6 address
  • "MX" records - the mapping from a domain name to the host name of an SMTP server
  • "NS" records - used to delegate a portion of the hierarchy to specific DNS servers
  • "PTR" records - typically used (via in-addr.arpa.) to map an IPv4 address back to a domain name
  • "CNAME" records - used to alias a domain name to its canonical version

DNS packets are conventionally transported over UDP and TCP port 53. UDP is more commonly used, but larger DNS responses and zone transfers require TCP. See RFC 5966.

This Wikipedia article provides an approachable introduction to DNS.

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DNS issue for internal website routing internet connection from remote location

I have an issue that I could use some help with. Our company has a main location and a remote location. Previously, the remote location was connected to the main location through an internet connection VPN tunnel. The connection was pitifully slow…
Michael Paul
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How to change the URL on my Amazon EC2 webserver

I am at the point in playing around with EC2 that I have launched a webserver. Right now, the website URL looks like http://ec2-.compute-1.amazonaws.com/ I am evaluating the usefulness of these services for my small business purposes;…
Sarah
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Does Bind9 update entries like Windows DNS server?

Does bind9 keep track of DNS entried for each new node that is added to the local network like Windows Server? Or will I have to add a forward and reverse entry manually for each node?
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What is proper relationship between /etc/hosts and DNS A records for a Linux server?

I have an Ubuntu server. It is going to be a web server with a URI of www.example.com. I have a DNS A record pointing www.example.com to the server's IP address. Let's say I pick "trinity" as the hostname for this server. I want to set up the DNS…
MountainX
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What problems can an ADSP record in DNS cause for mailflow?

ADSP is an entry in DNS that works allows a domain owner to assert that all email must be signed with DKIM. (similar to the -all and ~all in SPF/SenderID). Messages that fail ADSP policy may be rejected. Apparently DKIM has a ton of issues with…
makerofthings7
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Exchange 2010 Internal Auto Discover Migrate away from current .local DNS name

We have an Exchange 2010 Server, running within our Active Directory domain, with an internal hostname of server.example.local. The server is configured for Exchange anywhere, but currently has a self signed certificate with a name of…
Bryan
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Clients didn't switch to secondary DNS server during fail over

I have two internal dns servers set up and all my servers have both of them in the resolv.conf Our main dns server went down and suddenly no server could see each other. I edited a few of the servers resolv.conf manually and committed out the first…
The Digital Ninja
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Updating GoDaddy DNS from linux

I have the following setup: A domain registered with GoDaddy A plug computer running ArchLinuxArm with a dynamic public IP Updated Domain in GoDaddy DNS Manager to point to public IP of plug computer So far so good. However, I need to…
Alfero Chingono
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How do you set up dynamic cname records?

The project I'm working on requires that we mask AWS EC2 host names with our own subdomains. For example: ec2-176-34-163-40.eu-west-1.compute.amazonaws.com would map to gf53ef.domain.com and ec2-123-31-124-60.eu-west-1.compute.amazonaws.com would…
Matt Votsikas McLean
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DNS Record Timestamps Are Not Updating on Server 2008 R2 DNS Server

I have 2 Server 2008 R2 domain controllers with a AD integrated DNS zone for the domain. Previously, scavenging was not enabled. I enabled scavenging a week ago and now that I am seeing old stale records go away, I am also noticing that about 80%…
TonyD
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BIND Whitelist Config

Im trying to setup a 'whitelist' DNS server for a small school network to prevent the kids accessing inappropriate sites (ie. students should only be able to access a pre-selected list of sites) and be forwarded to an access-denied page if they try…
garyj
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DNS Redirection - no such thing, or is there?

Some domain registry like europeregistry.com allows users to buy and register a domain and set up a "redirection" to an existing website. Is this redirection a function of DNS or has the registry setup a behind-the-scenes webserver that does a HTTP…
Jake
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How to automate DNS server reconfiguration for TCP/IPv4 and TCP/IPv6 in Windows 7?

I need to switch Internet Protocol Version 4 (TCP/IPv4) and Internet Protocol Version 6 (TCP/IPv6) settings for DNS server configuration from "Obtain DNS server address automatically" to hard coded values (for Google's DNS servers) and back. It's…
Alek Davis
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webserver running as nobody cannot resolve domain names

If i try to run the following: through the web server I get a an "php_network_getaddresses: getaddrinfo" error. If I run the same file from the shell with: php test.php then I get…
jalal
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How can I permanently remove default root hints from a Server 2008 DNS server?

My network exists in private address space and I am unable to perform DNS lookups against DNS servers on the internet directly (blocked by firewall). There are other networks that exist in the same private address space as my network. I need to be…
TonyD
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