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[Bug 991463] firewall can't (easily) open port for (incoming) broadcasts
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Sat, 15 Jul 2017 06:46:42 +0000
  • Message-id: <bug-991463-21960-khr0TBzX22@http.bugzilla.novell.com/>
http://bugzilla.novell.com/show_bug.cgi?id=991463
http://bugzilla.novell.com/show_bug.cgi?id=991463#c7

--- Comment #7 from Markus Greger <Markus.greger@xxxxxxx> ---
(In reply to Matthias Gerstner from comment #6)

I tested listening with nc like

while true ; do nc -lu -w 1 0.0.0.0 15000 ; done

I tested sending (from a different computer) with repeated socat's like

i=0; while [ $i -le 100 ]; do i=$(( i + 1 )); echo “HELLO-$i-`hostname`” |
socat - UDP-DATAGRAM:REPLACE-IPV4-BROADCAST-ADDR-HERE:15000,broadcast; sleep 1;
done

My tests confirm adding the port to "firewall -> Broadcast -> Broadcast
Configuration -> (Internal/DMZ/External Zone)" makes broadcast traffic pass
through in OpenSuse 13.1 as well as in Leap 42.2.
I've not tested the "related traffic" part of comment #6.

I would think a non obvious configuration - which took quite some time to get
down to - leads to non obvious system behavior and thus to a bug (see:
https://en.wikipedia.org/wiki/Software_bug "A software bug is an error, flaw,
failure or fault in a computer program or system that causes it to produce an
incorrect or unexpected result, or to behave in unintended ways.").

Therefore it would be great if the yast configuration dialog could be worked
over to change behavior or to make it easier to comprehend.

Thank you.

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