SSHD: Limit login attempt rate

I'm running an sshd on Fedora 8, and have recently been getting
swamped with people trying to log in (i.e., break in). It's configured
to only allow three authentication attempts per connection, but they
just keep reconnecting: probably some script kiddies with port
sniffers and password testers. Is there a way to configure it so that
there's a timeout after failed attempts? For example, if a particular
address tries and fails three times to authenticate, that address is
blocked for three hours, or something similar?

Thanks,
-Brian
.

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