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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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Assigning multiple IPv6 addresses on a Server

Let me uncover my intent. My host provides hundreds of IPV6 addresses free, but charge for an IPV4 address. I have several sites under one server and I was wondering if I can give each site/domain it's own ipv6 address. Is that even possible? If so…
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vmware DNS in host-only configuration

I want to connect a Linux VM running in VMWare on a Windows 7 laptop to an enterprise network using host-only configuration. I was able to setup bidirectional routing between "host-only" VMWare network and the enterprise network. If I add DNS…
nponeccop
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Recommendation for a free and small DNS server for Windows

I'm looking for a free (GPL or BSD) and lightweight DNS server that runs on Windows, which I can use as a server for my coLinux installation, which, when configured via slirp, always gets the Windows server as it's only DHCP-assigned DNS server (I…
Mikeage
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Redirect email using DNS?

I own a custom domain, i.e myself.com. I would like to make all email sent to me@myself.com to be delivered to myself@hotmail.com. I do not want to use Google's Google Apps, or Microsoft's Live Admins. Is this possible using DNS only?
itaysk
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Windows Server 2008 R2 DNS - Syncronizing changes to TTL

I apologize if this has been asked. My searches have not been successful. If I have 2 DNS servers in my Domain and add an A record to 1 server, that record is successfully propagated to the second server. If, however, I edit the TTL for a specific…
JFish222
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Microsoft DNS - Access is Denied. Event log: The DNS server was unable to open Active Directory

I've just had an issue arrise that I cannot seem to solve. I recently set up a Windows Server 2008 DC with DNS and DHCP and all has been working fine, but I discovered today that when I go into the DNS Manager I get the following issue: DNS. Access…
Jake Andrew
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Can the dns' domain be in its own spf record?

I'm finally fixing up my dns zone files in Gandi, which has a handy feature that lets me use the same zone file for several domains. So I can keep 1 zone file for a single domain and all its tld's. But normally, when you set up the SPF record for eg…
Jelle De Loecker
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Active Directory Split-Zone vs SubDomain Domain Name

Note - I know there are a ton of questions around AD Naming. I do not believe though that this is a duplicate question. If it is please link me to a relevant one :). We are implementing AD. Our big issue is the domain name. We already have decided…
CogitoErgoSum
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How to do views in Unbound DNS Server

How would I use the BIND "views" feature in Unbound? I don't seem to be able to find anything online regarding this.
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How to make BIND behave differently depending on query source?

How would one make BIND behave differently depending on the source IP address? For example, I want to use different forwarding DNS servers for different people on my network.
Richard Hum
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prevent geo tagging on DNS requests

I have multiple offices in other countries that egress out of one location. The problem is that the DNS replies are being resolved for that country as opposed to the country the user is actually in. Example: user does a request for google, and gets…
Matt
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Bind 9.7.3 not forwarding to ISP DNS server (only local resolving successful)

I have a bind DNS where I have installed SAMBA and made it a BDC. I plan to promote it to PDC and take out the Win2003 AD server to replace it with Samba. Bind is installed on that same server as Samba and internal resolving work fine. However…
Huzefa Akhter
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Zone transfer Windows Server DNS from NSD

I have a NSD server being primary server for a zone and want a Windows Server (2008 and 2012 RC) box to be secondary for that zone. Everything is configured and working EXCEPT: When Windows receives a notify message from NSD it sends an IXFR zone…
SaneMax
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Windows DNS Server slow response time

Our Windows 2008 R2 SP1 DNS server has a response time of > 3500ms but as low as 1.2ms with a mean of 124ms. I am using OpenDNS for my forwarders. I also enabled 'scavenge stale resource records' and installed the IPv6 disabled hotfix and I'm…
David Neudorfer
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Detect CNAME chains in BIND zone file

Are there any tools available to automatically detect (and optionally correct) CNAME chains in BIND zone files? I am trying to clean up a rather large zone file (15,000+ resource records) so I'm looking for tools that can perform static analysis to…
Nic
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