I have a seemingly simple question but couldnt find the answer to precisely that question after some search. Most often, a nonauthoritative server answers with a previous lookup from its lookup cache. I am printing one line to file1 and another to file2, then using paste. Nonauthoritative name servers do not contain original source files of domains zone. Therefore, i want to start out by showing you some of the. Get an authoritative answer to get an authoritative answer you need to specify the authoritative primary name server at. But your nslookup command doesnt work the way you want it to, so thatll be wrong too. Articles related to why we get non authoritative answer on ns lookup. Then when i type nslookup and my domain name i get my domain name, and something about a non authoritative answer. Dns not authoritative between ns1 and ns2 digitalocean. What is authoritative and nonauthoritative dns server tecadmin. The same for dns3 and dns4 dig and nslookup run on those servers all work fine. To open nslookup, open a command prompt from the start menu. When i type nslookup and my ip number i get the namei think that my isp gives me on his machine.
But avoid asking for help, clarification, or responding to other answers. The hash, and number after is the default tcpudp name server port. I know that, if i want to look up the ip address of some domain name, i type, for example. I believe that you receive a nonauthoritative answer because, by default, nslookup asks your nameserver to recurse in order to resolve your query and because your nameserver is not an authority for the name you are asking it about. Nslookup has a fairly rich syntax and can be a bit confusing. I believe that you receive a non authoritative answer because, by default, nslookup asks your nameserver to recurse in order to resolve your query and because your nameserver is not an authority for the name you are asking it about. Nslookup has a fairly rich syntax and can be a bit. However, the answer in this section is nonauthoritative because it originates from a server cachens1. An authoritative answer comes from a nameserver that is considered authoritative for the domain which its returning a. Sep 01, 2011 however, non authoritative servers are not authoritative for any domain they do not contain specific zone files for. Feb 15, 20 when i nslookup behind our firewall i got non authoritative answer like this non authoritative answer. At first i thought it might be a security feature on oxfords part that perhaps they hide their dns address from nslookup so as to avoid attacks on those servers. In the above screen, you can see that there is a term called nonauthoritative answer.
An authoritative name server provides actual answer to your dns queries such as mail server ip address or web site ip address a resource record. If a dns server responded for a dns query which doesnt have original file is known as a nonauthoritative answer. X after appending period to the fqdn it is correct, it no longer returns a public ip address for our web server and appends our domain to the external fqdn. Youll want the soa start of authority record for a given domain name, and this is how you accomplish it using the universally available nslookup command line tool command line nslookup set querytypesoa server. Reverse nslookup returns lame nonauthoritative answer. I have obviously misconfigured something in dns2, 3, and 4 but i. This means that the server you queried is not the authoritative server for the domain you queried, meaning 8. Most often, a non authoritative server answers with a previous lookup from its lookup cache. This page tests the states dns servers by looking up the following names. Nslookup command, it assumes that you are querying a local domain on your private network. How to check dns records using basic nslookup command. Nslookup has a fairly rich syntax and can be a bit confusing for those who have not worked with dns a great deal. You may notice the nonauthoritative answer, this simply means the nameserver queried does not hold the entire zone for the domain in other words it doesnt have every single record more on that later.
A dns server is authoritative for the zones it holds, if it has to refer your query on to find the answer, this is nonauthoritative. Below this information however is the non authoritative answer. Articles related to why we get nonauthoritative answer on ns lookup. Yet, im getting a nonauthoritative answer, implying the a record is cached on my dns server. The difference between an authoritative an a non authoritative response is whether the information comes directly from an authoritative server or from data cached in a non authoritative server. It does not provides just cached answers that were obtained from another name server. What is authoritative and nonauthoritative dns server.
Aug 18, 2014 in this case, the response is a nonauthoritative answer. The nslookup command is useful to illustrate how dns traffic flows and to troubleshoot issues. An authoritative answer comes from a nameserver that is considered authoritative for the domain which its returning a record for one of the nameservers in the list for the domain you did a lookup on, and a nonauthoritative answer comes from anywhere else a nameserver not in the list for the domain you did a lookup on. Any answer that originates from the dns server which has the complete zone file information available for the domain is said to be authoritative answer when the dns servers maintains a cache file for the results of all queries performed in the past, and received an authoritative response, when a dns query is asked for, it. I have obviously misconfigured something in dns2, 3, and 4 but i dont know what. Jul 25, 2019 nonauthoritative name servers do not contain original source files of domains zone. They have a cache file for the domains that is constructed from all the dns lookups done previously. Yet, im getting a nonauthoritative answer, implying the. This answer is shown when the reply comes from a source which is not considered authoritative for the domain. You can get an authoritative answer by querying the authoritative nameserver for the domain you are interested in. Then when i type nslookup and my domain name i get my domain name, and something about a nonauthoritative answer. An authoritative answer comes from a nameserver that is considered authoritative for the domain which its returning a record for one of the nameservers in the list for the domain you did a lookup on, and a non authoritative answer comes from anywhere else a nameserver not in the list for the domain you did a lookup on.
You can query an external domain, but nslookup will try to search for the domain internally first. It associates various information with domain names assigned to each of the participating entities. For example, nslookup if when running the command you have the line nonauthoritative answer. Lets try querying an authoritativeonly dns server with nslookup. How to check dns records using basic nslookup command examples. May 21, 2016 in the above screen, you can see that there is a term called non authoritative answer. Does not imply that there is an answer to the query. The nslookup tool is a great tool for troubleshooting dns. If i perform an nslookup against, nslookup returns the. An authoritative answer is when the dns server hosting the primary copy of the dns record responses to your lookup. Tutorial on nslookup commandline tool to query dns records. Need info about a nslookup nonauthoritative response.
Ethereal dns july05 university of california, berkeley. Should return the ip address of the bbc web server, usually. To learn more, see our tips on writing great answers. If neither of these conditions exist, nslookup will not be able to retrieve any. If you run into issues leave a comment, or add your own answer to help others. To specify a specific dns server to use for a query, you need to provide the dns server address as the second parameter. Finally, the answer also includes the ip addresses of the authoritative dns servers at mit. This server is the default server that your system uses for dns name resolution. Any answer retrieved from the cache of any server is deemed nonauthoritative because it did not come from an authoritative server. Why cant i get an authoritative answer from a dns server. Im looking at the nslookup command, and i couldnt exactly understand the results it shows. However, nonauthoritative servers are not authoritative for any domain they do not contain specific zone files for.
To look at the name server records for a particular website, enter in nslookup followed by the web address. The domain name system dns is a hierarchical and decentralized naming system for computers, services, or other resources connected to the internet or a private network. Why cant i get an authoritative answer from a domain name. If you find them useful, show some love by clicking the heart. Mnet servicestelecom data networking nonauthoritative dns test. This may be wrong as its too early to grab my notes, but im certain authoritative is when you nslookup a domain which isnt already cached, and non authoritative occurs when the address you are looking for has already been cached, allowing us to retrieve the information faster. This answer is shown when the reply comes from a source which.
How to choose a vps or virtual private server by a starter or someone who wants to shift from free blogs like wordpress, tumbler or blogger or want to upgrade. However, nslookup also indicates that the answer is nonauthoritative, meaning that this answer came from the cache of some server rather than from an authoritative mit dns server. It provides original and definitive answers to dns queries. Your primary dns server will return authorative answers when queried about your hosts, but to get authorative answers for you would need to ask their dns server. The ip address returned is our external dns providers default web page when it cannot resolve an ip address in our case opendns. Any answer retrieved from the cache of any server is deemed non authoritative because it did not come from an authoritative server. Authoritative vs nonauthoritative dns server spice up your. Oct 03, 2009 nslookup question nonauthoritative answer. Mnet servicestelecom data networkingnonauthoritative dns test this page tests the states dns servers by looking up the following names. A nonauthoritative answer is an answer form your dns server when it has had to refer the query to another dns server. The difference between an authoritative an a nonauthoritative response is whether the information comes directly from an authoritative server or from data cached in a nonauthoritative server. Most prominently, it translates more readily memorized domain names to the numerical ip addresses needed for locating. Find out which dns server answered your query server fault. In this case, the response is a nonauthoritative answer.
The first step is to determine the authoritative dns servers for that domain from the soa statement of authority record. Aug 17, 2009 an authoritative name server provides actual answer to your dns queries such as mail server ip address or web site ip address a resource record. Nslookup command not resolving internet address islandearth. Dns nslookup what is the meaning of the nonauthoritative. No answer for more information, i append output of dig command. No answer i presume the problem is still dns related. When i nslookup behind our firewall i got nonauthoritative answer like this nonauthoritative answer. This means that my dns server queried an external dns server in an effort to resolve the ip address.