ZDNet Australia: Monitoring Linux Firewalls with firelogd

“Log monitoring helps you track possible access problems,
provides data on the effectiveness of your rule sets, and documents
hack attempts.

“Monitoring such activity provides an excellent means to check
out what’s hitting your server and fix problems before they get out
of hand. However, firewall logs tend to contain verbose network
information in as compact a message as possible, which can be
rather tedious to sift through.

“This is where firelogd comes in handy. The firelogd program
monitors Linux firewall logs and e-mails summarised alerts to an
administrator’s e-mail address…”

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