Is there anyone here who can advise me where in the source tree I would
find the DNS resolver code that performs AAAA/A record lookups, and more
specifically, the fallback to A lookup if AAAA fails?
Assuming you're considering getaddrinfo(), see res_queryN() in
lib/libc/net/getaddrinfo.c.
BTW: "fallback" does not really accurately describe the behavior.
When AF_UNPSEC is specified, both AAAA and A queries are issued,
whether or not the AAAA query fails.
Thank you for the info. I did not know that little tidbit.
I've got my first IPv6 DNS, mail, web etc server up and running now, and
before I think about migrating the actual production network, I want to
perform some extensive testing, all the while being familiar with the
framework of the resolver itself, and how to overcome particular
DNS/connectivity issues (if possible).
ie: I want to learn more about how DNS and IP react in the event I lose
my IPv6 BGP peers (or IPv4 peers), and also write in some debug log
writing into the resolver if certain events trigger.
Steve
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