Try port knocking. It is very effective. Your ssh port will be closed until you successfully hit certain number of ports and even though the ssh port will be open only to the IP address that successfully opened the port all others will see ssh port as closed.
-- #Joseph On Mon, 2006-06-05 at 12:06 -0300, Leandro Melo de Sales wrote: > Hi, > > today when I was checking the server log I got many external > attempts to connect to my sshd service: > > ... > Jun 5 05:09:45 embedded sshd[4740]: Invalid user barbara from x.y.w.z > Jun 5 05:09:46 embedded sshd[4742]: Invalid user barb from x.y.w.z > Jun 5 05:09:48 embedded sshd[4744]: Invalid user barbie from x.y.w.z > Jun 5 05:09:50 embedded sshd[4746]: Invalid user barbra from x.y.w.z > Jun 5 05:09:51 embedded sshd[4748]: Invalid user barman from x.y.w.z > Jun 5 05:09:53 embedded sshd[4750]: Invalid user barney from x.y.w.z > ... -- gentoo-user@gentoo.org mailing list
