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General informations

The Linux kernel configuration item CONFIG_DNS_RESOLVER:

Help text

Saying Y here will include support for the DNS Resolver key type which can be used to make upcalls to perform DNS lookups in userspace.

DNS Resolver is used to query DNS server for information. Examples being resolving a UNC hostname element to an IP address for CIFS or performing a DNS query for AFSDB records so that AFS can locate a cell's volume location database servers.

DNS Resolver is used by the CIFS and AFS modules, and would support SMB2 later. DNS Resolver is supported by the userspace upcall helper "/sbin/dns.resolver" via /etc/request-key.conf.

See Documentation/networking/dns_resolver.rst for further information.

To compile this as a module, choose M here: the module will be called dns_resolver.

If unsure, say N.



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