validating DNS resolver
unwind is a validating DNS resolver. It is
intended to run on client machines like workstations or laptops and only
listens on localhost.
unwind sends DNS queries to
nameservers to answer queries and switches to resolvers learned from
dhclient(8) if it detects that DNS queries are blocked by the local
network. It periodically probes if DNS is no longer blocked and switches
back to querying nameservers itself.
unwind keeps the DNS answers in a cache
shared by the different DNS name server types.
unwind manages the cache size by deleting oldest
entries when needed. The cache is non-configurable and is lost upon process
unwind enabled at boot time, use
“rcctl enable unwind”, which sets
supersede domain-name-servers 127.0.0.1;
to /etc/dhclient.conf configures a machine
using DHCP to use
unwind can be controlled with
the unwindctl(8) utility.
The options are as follows:
- Do not daemonize. If this option is specified,
unwindwill run in the foreground and log to stderr.
- Specify an alternative configuration file.
- Configtest mode. Only check the configuration file for validity.
- Use an alternate location for the default control socket.
- Produce more verbose output. Multiple
-voptions increase the verbosity. Debug output from libunbound is only available when logging to stderr.
- Trust anchor for DNSSEC validation.
- UNIX-domain socket used for communication with unwindctl(8).
unwind.conf(5), dhclient(8), unbound(8), unwindctl(8)
P. Mockapetris, DOMAIN NAMES - CONCEPTS AND FACILITIES, RFC 1034, November 1987.
P. Mockapetris, DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION, RFC 1035, November 1987.
unwind program first appeared in
unwind program was written by