Systemd/src/resolve/resolv.conf
Tore Anderson 93158c77bc resolve: enable EDNS0 towards the 127.0.0.53 stub resolver
This appears to be necessary for client software to ensure the reponse data
is validated with DNSSEC. For example, `ssh -v -o VerifyHostKeyDNS=yes -o
StrictHostKeyChecking=yes redpilllinpro01.ring.nlnog.net` fails if EDNS0 is
not enabled. The debugging output reveals that the `SSHFP` records were
found in DNS, but were considered insecure.

Note that the patch intentionally does *not* enable EDNS0 in the
`/run/systemd/resolve/resolv.conf` file (the one that contains `nameserver`
entries for the upstream DNS servers), as it is impossible to know for
certain that all the upstream DNS servers handles EDNS0 correctly.
2018-12-17 15:15:18 +01:00

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# This file belongs to man:systemd-resolved(8). Do not edit.
#
# This is a static resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists no search
# domains.
#
# Run "resolvectl status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.
nameserver 127.0.0.53
options edns0