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In many cases, you want to log any connection that is not allowed through your firewall.
firewall-cmd should have a built-in option for adding this capability.
This should, by default, exclude multicast and other broadcast traffic but options should be included for enabling logging for such.
Suggestion:
firewall-cmd --log-dropped --zone <zone> [--log-broadcast] [--log-custom <port>]
Fixed upstream: https://github.com/t-woerner/firewalld/commit/014d3345e7fb6436df94f0bad22c5166a4d0e157
New LogDenied support
If LogDenied is enabled, logging rules right before reject and drop rules in
the INPUT, FORWARD and OUTPUT chains for the default rules and also final
reject and drop rules in zones.
Possible values for LogDenied are: all, unicast, broadcast, multicast and off.
Fixes issue #59
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHSA-2016-2597.html