As far as I can gather from readin sshd(8) and the source code
(get_hostfile_hostname_ipaddr in upstream's openssh-6.1p1), at most two
key lookups are performed:
(a) [Only for protocol version 1] One for the ip address of the remote
host, with put_host_port(ntop, port)
(b) One for the hostname.
(1) If it is an HostKeyAlias, just look for the hostname,
(2) else for put_host_port(hostname, port).
In the bugzilla entry #910 [1], I found that a fallback option (look for
hostname only, if (b.2) fails) was discussed, but if I understand it
correctly, this never was included.
I also mailed the OpenSSH mailing list to confirm that my analysis is
correct [2].
[1] https://bugzilla.mindrot.org/show_bug.cgi?id=910
[2] http://marc.info/?l=openssh-unix-dev&m=135221834426513&w=2
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