![]() The ping command is probably already on your system, provided by the iputils package, but the other ones are in bindutils and aren't installed by default. This article compares four useful tools for testing name resolution on your Linux systems:īefore you begin, ensure the commands are installed. ![]() When troubleshooting, it can be useful to query specific name servers and examine their administrative resource records. Perhaps users can connect to a server, but it isn't the correct server, so an unexpected web page is displayed.īecause there are many types of name servers, especially in large networks, it can be difficult to determine the culprit. Users may experience intermittent difficulty accessing an internal web server or related service. What might make you suspect a name resolution problem? Perhaps a user comments that they can no longer reach a resource such as a file server or printer, or an email server seems unavailable. When a reverse lookup query arrives, the PTR for that IP address services it. When a forward lookup query arrives, it is serviced by the A record for that name. PTR maps an IP address to a particular name. The A records service forwards lookup requests, specifying that a given name is related to a particular IP address. The two most common record types are A and pointer records (PTR).
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