In article Bill Marcum writes:
$Perhaps it depends on the specific version of sshd, but I don't see
$AllowHosts in the man page of sshd_config or ssh_config.

Me neither. Typing "allowhosts" into Google turns up an answer:
this is apparently a directive that can be used with ssh.com's ssh
server, which is a commercial package and different from openssh.
If the original poster is using openssh, that would explain it.

If the goal is to allow hosts inside the firewall to connect via
ssh and block hosts outside the firewall, it would be better to configure
the firewall not to allow ssh connections from the outside world.
But if you want to do it within sshd, or if you need finer granularity
than your firewall can provide (e.g. if you want to allow only certain
internal hosts while blocking others), you might use a Match Address
directive so that you can apply different settings (e.g. AllowUsers *
for your internal network or DenyUsers * for the rest of the world),
or wrap sshd with tcp_wrappers (but see the sshd man page for a warning
about efficiency in this case).
--
Stephen M. Dunn
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