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16 votes
Accepted

Is it possible to combine DNS name servers?

DNS records are a hierarchy. Anything at the same level (v1.example.com, v2.example.com, etc) will all be resolved by the NS records set for that level (example.com) You can have different ...
Tim Brigham's user avatar
  • 15.6k
15 votes
Accepted

Why send authoritative nameserver in DNS?

Traditionally name servers don't send a short response to a query but an RFC 1034-1035 compliant full response which includes the authority section that contains Resource Records that point toward ...
HBruijn's user avatar
  • 81k
14 votes
Accepted

Does a multi-level hostname makes a practical difference?

There will be potentially be an extra delay as creating a separate zone for the world.example.com subdomain typically also implies delegation to different authoritative name servers. If the same ...
HBruijn's user avatar
  • 81k
13 votes
Accepted

How to set SOA Expire Value?

The expire field in a SOA record is the upper limit, in seconds, that your secondary name servers are allowed to use the data before it expires for lack of getting a refresh. You normally do want this ...
HBruijn's user avatar
  • 81k
13 votes
Accepted

Setting sub domain DNS to route default port 80 to custom port

For general HTTP purposes (web browsing, etc.), DNS cannot be used to direct a browser to use a specific port. Browsers are hard-codes to assume 80 for HTTP and 443 for HTTPS. You "could" host ...
Greg W's user avatar
  • 766
12 votes
Accepted

Changing A record and CNAME records

As mentioned in the comments, you will need to use A records instead of CNAME records. CNAME records will not be able to point at an IP Address. The key to making each of the sites to work is to ...
Dre's user avatar
  • 1,844
12 votes

Moving many sites to new server - whats the quickest way to update their DNS records?

The term you're looking for is CNAME, and the answer to your question is both yes and no. First, here's an example of how a CNAME works in a zone file. example.se IN SOA ns1.example.se. ...
Jenny D's user avatar
  • 28.2k
11 votes

Changing A record and CNAME records

Use A record to point to the sub domains myurl.com. A 300 123.123.123.123 api.myurl.com. A 300 123.123.123.123 app.myurl.com. A 300 123.123.123.123 preview.myurl.com. A 300 123.123.123....
Anthony Fornito's user avatar
10 votes

Find out which DNS server answered your query

See this https://stackoverflow.com/questions/38021/how-do-i-find-the-authoritative-name-server-for-a-domain-name in short, nslookup set the query type to SOA single line: nslookup -querytype=soa ...
Phillip Williams's user avatar
10 votes

What are Top level domain server in DNS.Wants to understand its significance in real time network traffic

I used to work for a domain registry and was part of IETF DNS workgroups, so I'll give you a primer. The Domain Name System is designed in a hierarchy. When you look up the data for a domain name, you ...
Too Short's user avatar
  • 173
10 votes
Accepted

Remote domain: DNS record A exists when NS does not

Non-standard domain parking DNS server The this-domain-for-sale.com or 52.20.26.87 is a misconfigured authoritative name server, as it does not respond with the same NS records as the parent zone. It ...
Esa Jokinen's user avatar
  • 50.3k
9 votes
Accepted

Find out which DNS server answered your query

I want to know what exact server in the end had the answer. Is that possible? This is not achievable. You will not find the specific authoritative server that was consulted named anywhere in the ...
Andrew B's user avatar
  • 33.2k
8 votes
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Why dig NS returns nothing for a domain while it can find an A record for that domain?

It works as expected. The incorrect assumption here is that all names should have NS records. Instead, the set of nameservers is defined on a per zone basis, with NS records at the zone apex only. ...
Håkan Lindqvist's user avatar
8 votes

Does a multi-level hostname makes a practical difference?

Technically, as I understand DNS, only the hello part is considered the host name, the rest is the domain name. As such, it resolves the same way, in your case the DNS zone includes both the example....
Stuggi's user avatar
  • 3,596
8 votes

How to concatenate DNS TXT records?

Just add another TXT record. You can have more than one. concatenating would make them both invalid, they need to stay separate.
Gerald Schneider's user avatar
7 votes
Accepted

CNAME as different domain name

Two issues collide here. The first is can a CNAME point to a different domain, to which the answer is yes, that is perfectly acceptable. The second, though, is that in the case of your example, you ...
MadHatter's user avatar
  • 80.9k
7 votes

How do I change reverse DNS on Google Cloud Compute?

Google won't configure reverse DNS for you If you had a carrier such as AT&T or an EC2 instance, they offer reverse DNS services. As of now, Google does not offer this as an attribute of their ...
Citizen's user avatar
  • 1,102
7 votes

How do I change reverse DNS on Google Cloud Compute?

Google just launched PTR record for Compute Engine. When you can edit the VM, in the Network interfaces, there is Public DNS PTR Record for configuration. Set it as your domain name and it will let ...
spicydog's user avatar
  • 171
6 votes

How do I change reverse DNS on Google Cloud Compute?

Following up on this topic, as of now, ie August 2017, Google Cloud gives access to this feature as a ßeta version. The procedure to make it work, as I did is: (I am using this fake ip of 123.456.789....
Jacques's user avatar
  • 161
6 votes

How do I change reverse DNS on Google Cloud Compute?

Theres hope! Paul Nash (Product Manager, GCE, Google) responded · Nov 2, 2016 We recognize that reverse DNS and PTR records in particular are important for certain applications like mail servers, ...
Thomas Schwärzl's user avatar
6 votes

What these strange TXT records in my default OVH DNS config mean

Based on this post at OVH community forums in French, it seems to be automatically added when domain is created in order to display the default webpage. Rough translation of the French message: ...
Patrick Mevzek's user avatar
6 votes
Accepted

Seamless transition from internet to local network

Hairpint NAT (sometimes called NAT Reflection) is what you need here. Some routers will do this automagically (often the cheap consumer ones will), but others will not (Mikrotik will not, but is a ...
Mark Henderson's user avatar
6 votes

What RFC encourages DNS servers to reply REFUSED to queries for unknown domains?

It's simple really, RFC1035 Section 4.1.1 RCODE 5 Refused - The name server refuses to perform the specified operation for policy reasons. For example, a name server may not wish to provide the ...
user9517's user avatar
  • 116k
6 votes
Accepted

Secondary Nameserver DNSSEC

As has been noted, the quoted statement is one service provider noting a limitation in their own service, it's not a universal truth. All that is really needed to make what you ask for work is this: ...
Håkan Lindqvist's user avatar
6 votes

Getting "Error: Invalid Value" while adding MX record in Google Cloud DNS

Under the preference and mail server field, you've to indicate priority to the MX record. For example, instead of "aspmx.l.google.com" it should be "1 aspmx.l.google.com" where MX server address has ...
GagandeepT's user avatar
6 votes
Accepted

Need to point WWW to another ip without impacting mail delivery

Yes, it is possible. That is why the web site was supposed to be www.example.com because you could have multiple services for the same domain server by different servers or the same server or any ...
Mircea Vutcovici's user avatar
5 votes
Accepted

how to find out who is managing my DNS records?

There are three parts to this. The first is your domain registrar. This organization is who you purchased the domain name from. The domain registrar is going to be the organization that specifies if ...
user5870571's user avatar
  • 3,184
5 votes

no current owner name error when running named-checkzone on both forward and reverse

As Julie Pelletier already commented, remove the leading white spaces in your zone records, as they hold a special meaning in Bind zone files. By starting a line with a white space (which is neither ...
HBruijn's user avatar
  • 81k
5 votes

No SOA record -- what are the implications?

SOA record at apex of every zone on the child nameservers is mandatory per DNS specification, see §6.1 of RFC 2181: The authoritative servers for a zone are enumerated in the NS records for the ...
Patrick Mevzek's user avatar
5 votes
Accepted

Reverse DNS/bind named-checkzone "zone NS has no address records (A or AAAA) error"

If the following line is supposed to be the GLUE record: dns IN A 10.100.48.51 you should use the FQDN of your nameserver, rather than DNS shorthand. That record now gets expanded as ...
HBruijn's user avatar
  • 81k

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