Per-port hostkeys

[Kevin DeGraaf]

My apologies if this has been covered already.  My search of the archives
was unfruitful.

OpenSSH seems to be lacking a certain capability present in ssh.com's
client; namely, the ability to store remote hostkeys on a per-port basis.

I have various machines that, due to iptables port-forwarding, appear to
be running copies of (open)sshd on multiple ports.  "Commercial" ssh
stores hostkeys in files named "key_<port>_host.pub"; this is useful,
because it allows for recording the keys of multiple sshd's on the same IP
address.

OpenSSH, on the other hand, doesn't appear to offer this functionality;
connecting to any sshd port on a machine will cache that hostkey, and
subsequent connections to sshd's on other ports of that machine will fail
with hostkey-checking violations.

--
Kevin DeGraaf