Date: Wed, 19 Jun 2019 08:26:53 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> To: "Ronald F. Guilmette" <rfg@tristatelogic.com> Cc: freebsd-net <freebsd-net@freebsd.org> Subject: Re: localhost woes -- help requested Message-ID: <201906191526.x5JFQrVT018680@gndrsh.dnsmgr.net> In-Reply-To: <26907.1560925410@segfault.tristatelogic.com>
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> In message <201906190617.x5J6HQmA016708@gndrsh.dnsmgr.net>, > Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> wrote: > > >> In message <201906181719.x5IHJ8g0014687@gndrsh.dnsmgr.net>, > >> "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> wrote: > >> > >> >What is in /etc/host.conf, /etc/resolv.conf, do you have DNS running? > >> > >> > >> 1) https://pastebin.com/raw/wXTTgd9R > >This is /etc/hosts, not /etc/host.conf > ># cat /etc/host.conf > ># Auto-generated from nsswitch.conf > >hosts > >dns > > > >> 2) https://pastebin.com/raw/PiGpN0LU > >> > >> 3) Yes, local-unbound > > > >Ok, if you comment out ::1 from /etc/hosts then the lookup is > >going to fall through to DNS with the default /etc/host.conf file > >and you'll get what ever your dns is configured to return, which > >is usually the exact some thing as /etc/hosts has. > > So basically you're telling me that local-unbound has taken it upon > itself to decide for me, regardless of what is or isn't in my /etc/hosts > file, what addresses "localhost" should resolve to?? Yes, dns resolvers shipping for the last 5 decades have all shipped with default "localhost" values. Both "localhost" and 127.in-addr.arpa zones existed iirc in the very first version of bind. > > If so, that really is rather presumptive on its part. No, well defined by RFC. I would suggest a starting read at https://en.wikipedia.org/wiki/Localhost Specifically this detail: In the Domain Name System, the name localhost is reserved as a top-level domain name, originally set aside to avoid confusion with the hostname used for loopback purposes.[3] IETF standards prohibit domain name registrars from assigning the name localhost. And finally: https://tools.ietf.org/html/rfc2606#section-2 at The ".localhost" TLD has traditionally been statically defined in host DNS implementations as having an A record pointing to the loop back IP address and is reserved for such use. Any other use would conflict with widely deployed code which assumes this use. Regards, -- Rod Grimes rgrimes@freebsd.org
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