Hello,
AI_ADDRCONFIG was
added in order to optimise DNS query traffic, so that only
useful addresses are queried for.
In other words, an IPv4-only node should not query its upstream
resolver for IN AAAA resource records,
while an IPv6-only node should not query for IN A resource
records.
The proper function of AI_ADDRCONFIG requires that:
1. The usual processing of all node-local and link-local names
and addresses is preserved as long as the respective addresses
are present.
2. The global name resolution is not affected by the existence
or non-existence of node-local and link-local addresses.
3. IN AAAA DNS queries should not be transmitted from a node
with no global IPv6 address, and vice versa: IN A queries should
not to be transmitted from a node with no global IPv4 address.
Unfortunately, the current implementation of getaddrinfo()
mostly follows the informational RFC 3493, which fails in both
#1, #2, and partially in #3.
https://fedoraproject.org/wiki/QA/Networking/NameResolution/ADDRCONFIG?rd=Networking/NameResolution/ADDRCONFIG
https://pagure.io/SSSD/sssd/issue/1665
I believe sssd as of now doesn't keeps strong hold of pre-conditions of using AI_ADDRCONFIG.
-- Thanks Amit Kumar !!If you stumble, get back up. What happened yesterday, no longer matters. Today is another day to move closer to your GOAL!!