Re: Fedora 33 System-Wide Change proposal: systemd-resolved

[Florian Weimer]

* Tom Hughes:
>    ·   Single-label names are routed to all local interfaces capable of IP
>        multicasting, using the LLMNR protocol. Lookups for IPv4 addresses
>        are only sent via LLMNR on IPv4, and lookups for IPv6 addresses are
>        only sent via LLMNR on IPv6. Lookups for the locally configured
>        host name and the "_gateway" host name are never routed to LLMNR.
>    Routing of lookups may be influenced by configuring per-interface
>    domain names and other settings. See systemd.network(5) and
>    resolvectl(1) for details. The following query routing logic applies
>    for unicast DNS traffic:
>
>    ·   If a name to look up matches (that is: is equal to or has as
>        suffix) any of the configured search or route-only domains of any
>        link (or the globally configured DNS settings), the "best matching"
>        search/route-only domain is determined: the matching one with the
>        most labels. The query is then sent to all DNS servers of any links
>        or the globally configured DNS servers associated with this "best
>        matching" search/route-only domain. (Note that more than one link
>        might have this same "best matching" search/route-only domain
>        configured, in which case the query is sent to all of them in
>        parallel).
>
>    ·   If a query does not match any configured search/route-only domain
>        (neither per-link nor global), it is sent to all DNS servers that
>        are configured on links with the "DNS default route" option set, as
>        well as the globally configured DNS server.
>
>    ·   If there is no link configured as "DNS default route" and no global
>        DNS server configured, the compiled-in fallback DNS server is used.
>
>    ·   Otherwise the query is failed as no suitable DNS servers could be
>        determined.

Thanks.  Does this mean that no search list processing happens, for
neither single-label names (per for the first paragraph), nor for
multi-label names (per the routing description)?  Or is this process
described in some other context?

Thanks,
Florian