Broadcast related blocking messages !!???
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I making changes in my network all the time, so I am not sure if this issue is 'new' or not.
What ever, I just noticed a lot of broadcast related blocking messages in the log (=> a.b.c.255/24).
And that looks strange to me since, I think those messages are strictly related to the local network and can, as far as my knowledge goes, never leave that local network.
I did add rules to 'pass' traffic towards '255' to get rid of the messages. However either I do not understand the situation correctly, or something is wrong.
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Even if they shouldn't pass the firewall, the broadcast packets are still received by the firewall. If your rules don't pass them, they would be blocked. Creating a rule to block or pass them without logging will stop them from being logged, but whether you choose to pass or block them is up to you. Most of the time the traffic wouldn't be relevant to the firewall but there may be some cases where it is (e.g. add-on services like Avahi)
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Thanks for this clarifying answer !