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Description of problem:

The file "/etc/ssh/ssh_known_hosts" supports multiple, comma seperated values for DNS-Names and IPs, so that one can associate multiple names/IPs with one host key. 

The FreeIPA should support host aliases and SSSD should support adding aliases into the output of the sss_ssh_knownhostsproxy so that one could use either connect to samplehost.example.com and samplehost.linux.example.com

How reproducible:

   always

Note that this already works as long as you use the canonical host name for the IPA host:

$ host a.example.com
a.example.com has address 1.2.3.4
$ host b.example.com
b.example.com has address 1.2.3.4
$ host 1.2.3.4
4.3.2.1.in-addr.arpa domain name pointer a.example.com.
$ ipa host-show a.example.com
<...>
$ ipa host-show b.example.com
ipa: ERROR: b.example.com: host not found
$ ssh a.example.com
<works>
$ ssh b.example.com
<works>

Upstream ticket:
https://pagure.io/freeipa/issue/6779

I am going to close this bz and let the UPSTREAM work continue.