Re: ipv6 maybe has arrived.
On Thu, Feb 09, 2023 at 03:02:22PM -0500, gene heskett wrote:
> Just last week I added another bpi5, copied the /etc/hosts file and
> restarted networking. It could NOT find the other machines on my net UNTIL I
> added that search directive to resolv.conf. This net is about 50/50 buster
> and bullseye.
Define "find". What command did you run? What was the result? What
were all of the relevant pieces of the name lookup configuration at
that moment?
unicorn:~$ grep hosts: /etc/nsswitch.conf
hosts: files mdns4_minimal [NOTFOUND=return] dns
unicorn:~$ cat /etc/resolv.conf
search wooledge.org
nameserver 127.0.0.1
nameserver 10.0.0.1
nameserver 8.8.8.8
unicorn:~$ grep gene /etc/hosts
11.12.13.14 hi.gene
unicorn:~$ getent hosts hi.gene
11.12.13.14 hi.gene
unicorn:~$ ping hi.gene
PING hi.gene (11.12.13.14) 56(84) bytes of data.
^C
--- hi.gene ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1002ms
If "find" for you means "I ran a CnC program that was written in 1995
and is a statically linked binary" then it's conceivable that it would
be looking for /etc/host.conf definitions, because it was statically
linked with libc5 resolver code. In that case, I would expect that
adding the proper libc5 setup in /etc/host.conf would cause it to start
working.
Is it POSSIBLE that the libc5 resolver code from the mid 1990s would
also look for host.conf stuff in resolv.conf? Uh... maybe, I don't know.
Who the hell knows. We would have to have your program (or something
from that age) to test with. Maybe strace it and see what it does.
But I can't imagine why you would go against all of the documented
practices of the time, and put the configuration in the wrong file.
Even in this incredibly hypothetical case.
There was also a libc4, but I don't remember how it worked. It was
much, much too long ago. Early 1990s. If what you're doing is from
the libc4 days, then I will apologize. But you've gotta find a single
piece of documentation that supports what you're doing.
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