A name server is a computer server that hosts a network service for providing responses to queries against a directory service.

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18
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11answers
5k views

djbdns vs bind [closed]

I'm a newbie who wants to learn how to set up a DNS nameserver. Should I use djbdns, BIND, or something else? Current network requirements include subdomain support, SSL, and mail service, all on ...
15
votes
5answers
21k views

Can you lookup a domains past nameserver & mx record history?

If is possible to find out which nameservers a domain was previously pointing too? I need to try and find where a domain was previously hosted so that I can try and gain access to an old hosted email ...
14
votes
4answers
1k views

How is it possible for the Root Name Servers to handle all DNS requests?

I was reading about DNS some days ago and learned how the requests are processed. If you surf to www.example.com, then a request will go to the Root Name Servers to see who owns that .com address, ...
13
votes
3answers
3k views

What percentage of nameservers honor TTL these days?

Some years ago I had to do several DNS changes over the course of several weeks as I moved bits of equipment from one data center to the other. At the time that I did this, about 95% of the ...
13
votes
1answer
2k views

Is dig +trace always accurate?

When the accuracy of a DNS cache is in question, dig +trace tends to be the recommended way of determining the authoritative answer for an internet facing DNS record. This seems to be particularly ...
7
votes
6answers
9k views

When is a secondary nameserver hit?

Take this scenario: domain: foobar.com ns1: 2.2.2.2 ns2: 3.3.3.3 My question: Is ns2 hit just in the event that ns1 is down? Or, is ns2 hit any time that ns1 returns a miss/doesn't resolve ...
7
votes
7answers
12k views

Finding all domains registered in a nameserver

Up until now, I was pretty confident that it was pretty much impossible to list all the domains handled by a nameserver. But apparently, there exists a couple of websites on the Internet that are ...
6
votes
2answers
4k views

Do CNAME records require time to propagate?

When I typically update DNS ("A" records) I will allow for an extended period of time for the changes to propagate throughout the root nameservers. Do I need to make this same allowance for updates ...
6
votes
3answers
4k views

Who does the nameserver 4.2.2.2 belong to?

Does someone know who is the owner of the Nameserver 4.2.2.2 ? I find a whois but I dont know the organisation.. Does someone know it ? Has someone searched before? Thanks for your help!
5
votes
7answers
3k views

Two name servers necessary?

I want to use my internet connection to host two personal websites (two different domains). I would also like to host mail for these domains. This requires hosting my own name server. In the ...
5
votes
3answers
2k views

Is it true that a nameserver have to answer queries over TCP?

I'm the process of setting up a monitoring of DNS servers of several large web hosts. My goal is to compare their dns servers response times by tracking their response to ping. In the process, I ...
5
votes
2answers
15k views

how do i set the dns server on godaddy with AWS?

I have a domain name on godaddy and i also have a amazon web services account. I have an EC2 instance and i want to change the dns nameserver on the godaddy control panel to aws and i have no idea ...
5
votes
3answers
864 views

Difference between Named and BIND

Can someone explain to me what the exact difference is between named and BIND?
5
votes
1answer
2k views

Can the value for a NS record be an IP address?

Until today I was used to believe it couldn't. From this page The name field can be any of: A Fully Qualified Domain Name (FQDN) e.g. example.com. (ends with a dot) An unqualfied name ...
5
votes
3answers
29k views

how to forward dns alias to hostname:port? [duplicate]

Possible Duplicate: How to use DNS to redirect domain to specific port on my server My web application is running on myserver.mydomain:10000 I would like to make it available on the ...
5
votes
3answers
530 views

Dns - wildcard vs. cname subdomains

Alright I have to admit I'm confused with how DNS works. I've always just added things until they worked, and now it's time to learn how they work. So one confusing thing to me is that there's sort ...
5
votes
5answers
706 views

Importance of PTR records on nameserver IP's?

I have not yet experienced any DNS failures due to a missing PTR record, but am wondering: Is there any added value in having a valid PTR record on a nameserver IP-address?
5
votes
2answers
104 views

How to determine which DNS server has the authority to set rDNS (PTR records)?

or to re-phrase... How to determine to whom authority has been delegated to set rDNS? Background In a multi-tier environment, where a block of IP's is assigned, then further split and assigned ...
5
votes
1answer
106 views

How to pick the right nameserver

Assuming the the following structure: example.com registered in the United Staates (ISP 1) example.ch registered in Switzerland (ISP 2) The server registered in Switzerland (ISP 3) Everyone of the ...
5
votes
2answers
292 views

Null MX records

The IETF appears to have had a draft to specify a null mx record whereby a domain would not handle mail and mail delivery systems would fail and return a undeliverable system immediately by directing ...
4
votes
6answers
2k views

DNS A vs NS record

I'm trying to understand DNS a bit better, but I still don't get A and NS records completely. As far as I understood, the A record tells which IP-address belongs to a (sub) domain, so far it was ...
4
votes
2answers
180 views

Can you use IP V6 for name server records

This might sound like a stupid question as I have a very basic grasp of DNS management, but I'm looking for a new VPS and most providers only offer one IPV4 address, which doesn't validate on ...
4
votes
6answers
930 views

How to get a cheap nameserver

I have some domain names and a hosting package at a certain provider. It is not a very advanced package, so I have no option to create a nameserver there. I have one domain name that I want to turn ...
4
votes
2answers
416 views

How are name server requests ordered?

Say I have a domain name registered with a website. On their site it says the following: Domain Name Servers listed in order: ns9.zoneedit.com ns18.zoneedit.com ns3.freedns.ws Are name servers ...
4
votes
2answers
208 views

Nameserver working for all TLDs except .org

I've recently set up a private name server (ns1.mediamechanic.net / ns2.mediamechanic.net), and it appears to be working for everything except our .org domains (see obapps.org). As far as I can tell, ...
4
votes
8answers
2k views

DNS performance: Does having multiple secondary NS servers improve performance?

When some domain have primary NS, and several secondary NSes, will clients ask them randomly to reduce the load, or they will hit primary NS only, and proceed to secondary only when primary fails?
4
votes
3answers
429 views

Question about non-authoritive DNS

I am trying to understand DNS and I have the following question: Are the terms secondary nameserver, non-authoritive nameserver and caching-only nameserver the same or are there differences? As I ...
4
votes
1answer
151 views

For Australian audiences, would an uncached .com.au domain resolve faster than an uncached .com?

Is there any speed benefit to using a .com.au domain rather than a .com if your customers, hosting and DNS services are in Australia, specifically in the worst typical case (domain is not cached in ...
4
votes
6answers
741 views

Should I run my own DNS recursor or local cache daemon?

I am on AWC EC2, as my server is going to make a lot of query for third party domains, I am thinking the following options install nscd on all servers use the default ec2 name recursor install my ...
4
votes
2answers
3k views

Configure a DNS server per nic interface (eth0 / eth1)?

How would you configure a DNS Name Server per NIC (eth0 vs eth1) interface on RHEL/Centos 6? E.g. eth0 is on subnet 10.0.0.1/24 eth1 is on subnet 192.168.0.1/24 Any requests sent over ...
4
votes
2answers
278 views

Understanding the DNS domain lookup mechanism

The specific query that led me to try and unpick this process was: Will a DNS lookup for a subdomain, such as assets.example.com, be faster if the parent domain, example.com, has already been ...
4
votes
2answers
184 views

Do I need to renew the keys which I deposited at my domain provider?

I have set up some domains with dnssec. I generated the keys and signed the zones with zonesigner from dnssec-tools. I know that I must resign the zones within 30 days. But what's up with the keys ...
4
votes
3answers
1k views

Will changing NameServers cause down time?

My domain registrar is Company A and we use two of their nameservers for DNS. We host our own server hardware in a datacenter that's not affiliated with Company A. Everything about Company A sucks. So ...
4
votes
2answers
157 views

Can I use a CNAME to point to a 3rd Parties NS Servers? [duplicate]

Possible Duplicate: In DNS can an IN NS point to a CNAME? I am in the process of migrating hosting providers. Currently I have significant number of domains pointed at my current NS ...
4
votes
1answer
110 views

Name Servers with Registrar vs. Host Provider [closed]

This may be a redundant questions, but is there any benefit to using name servers with a registar provider vs. a hosting provider? Some shared hosting accounts through places like 1&1 ask that ...
4
votes
1answer
3k views

slow DNS resolution

I have a DNS server that resolves all queries for an internal group of servers. It is a bind on CentOS 5.5 (same as RHEL5) and I have set it up to allow recursion and resolve direction without any ...
4
votes
1answer
89 views

What TLDs should I use for my NS records for redundancy? (DNSSEC support required)

Question As a general practice, is it a good idea to use multiple TLDs for the name servers? How should I choose between which TLD would be a good candidate for being the root server for my NS ...
3
votes
8answers
4k views

why are there several nameservers for my domain?

Like I have for my domain: ns1.somedomain.com IP: 122.some.ip.here ns2.somedomain.com IP: 122.some.ip.here Why there are 2 or more of them? The hosting is just one server and if that falls ...
3
votes
7answers
823 views

How can I prevent someone else's name server registration from pointing to my IP addresses? (i.e. change com zone file)

I got a new IP address block from my ISP; lets call it 2.2.2.0/25. 2.2.2.1 and 2.2.2.2 get frequent DNS traffic; looking at the traffic; it's destined for the nameservers ns1.tp.com and ns2.tp.com. ...
3
votes
7answers
1k views

Secondary DNS server? [closed]

I'm looking for a service to host my secondary nameserver. I've been looking at DynDns because of the great feedback I see on ServerFault & other sites. But I'm looking at two of their plans: ...
3
votes
4answers
1k views

What is the correct behaviour when Nameservers Change

I have been having some issues with a certain network supplier over unchanged nameservers making my site invisible to their customers. I wouldnt be bothered except that they are one of the largest ...
3
votes
3answers
1k views

Moving from one ISP to another; DNS PTR question

We are going to be moving from one ISP to another in the next month or so, and I will be changing the TTL's down to 60 seconds on the DNS servers that I have authority for, but our current ISP has ...
3
votes
4answers
3k views

Best Practices in Speeding-up DNS Propagation [duplicate]

Possible Duplicate: How long does it take for an A record to propagate? I recently changed nameservers and it has been 24 hours since. Some of my visitors are complaining they are still ...
3
votes
4answers
9k views

Redirect subdomain.example.org to somethingelse.com hidden to the user?

I'm not knowledgeable at all about C-NAMES, A-RECORDS, name servers and the like, so just bear with me on this one: I want to redirect subdomain.example.org to another domain somethingelse.com. I do ...
3
votes
3answers
3k views

Root, Local and Authoritative name server?

I've tried to read in Wikipedia about the key features of Root, Local and Authoritative name servers... But I have a problem understanding what each type of dns server does. Can someone please give me ...
3
votes
2answers
111 views

DNS NS and domain clarification

I am really trying to get my home web server up and I don't seem to be succeeding. My web server withing my host system is running my web application and is viewable at the current isp ip ...
3
votes
3answers
615 views

Nameserver can't be resolved globally. Server has been down for 30 hours

My server is under domain botoholic.com. I've started a dedicated hosting plan with the company Superhost.pl in Poland. My domain provider is Namecheap.com and my DNS is configured on the dedicated ...
3
votes
3answers
232 views

Are the Root Name Servers the Only machines with the full domain listings?

Sorry, my question is a of 2 parts, I hope that's acceptable here.. Ok here we go Are there other servers that maintain all domain names for a single TLD (other than the root name servers)? Can I ...
3
votes
2answers
8k views

Tool to check DNS records from multiple nameservers?

Is there a desktop or online tool that will query multiple name servers (dozens ideally) to get an idea if and how a DNS record change is propagating? I know of many free tools, but they only check ...
3
votes
2answers
2k views

Can I point my DNS to nameservers of different web hosts?

I was told that the DNS for my domain is unreliable, so basically I was wondering Could I set my secondary DNServers that points to another webhost altogether ? : ns01.host-FOO.com ns01.host-BAR.com ...