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Re: pf port knocking



On Friday 17 December 2004 06:11, A wrote:
> Further, "jasper" is the only machine that is externally accessible via
> SSH (the only other open ports are domain, web and mail on other
> servers). I need to leave SSH open as a number of people work remotely
> and tunnel through it to some of the services on the internal network.
Try to reduce the access with options like OS-fingerprinting, src-IP, 
src-port.