6.5 Domain Name Server Under Control
Two plugins are also available for testing the Domain Name Service (DNS): check_dns and check_dig. While check_dns tests whether a host name can be resolved, using the external nslookup program, check_dig allows any records at all to be queried. Both plugins are part of the standard distribution.
The situations in which they are used overlap somewhat. With check_dns, you can also explicitly query a specific DNS server, although this plugin is really for checking whether the name service is available generally.
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