Four techniques for monitoring server logins

With four Debian servers, each available over both IPv4 and IPv6, login attempts come from many sources. Gabriel Koen, in response to my backups post, asked what I do to monitor logins.

Currently, I use four tools to deal with login monitoring, equally split between proactive and reactive solutions. I don’t believe that any of these are Debian-specific, but I have no relevant experience with other distributions.

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