/usr/share/shorewall/macro.mDNSbi is in shorewall 5.0.15.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Shorewall -- /usr/share/shorewall/macro.mDNSbi
#
# This macro handles bidirectional multicast DNS traffic
#
###############################################################################
#ACTION SOURCE DEST PROTO DPORT SPORT ORIGDEST
PARAM - 224.0.0.251 udp 5353
PARAM - - udp 1024: 5353
PARAM - 224.0.0.251 2
PARAM DEST SOURCE:224.0.0.251 udp 5353
PARAM DEST SOURCE udp 1024: 5353
PARAM DEST SOURCE:224.0.0.251 2
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