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Which OSI layer you looking for?

Mac Layer: MAC broadcast is ff:ff:ff:ff:ff:ff so to the filter would be

"eth.addr!=ff:ff:ff:ff:ff:ff" (if you have wireshark >3.6) or "!(eth.addr==ff:ff:ff:ff:ff:ff)"

IP Layer: could be tricky, as the IP Broadcast can be 255.255.255.255 or the highest IP in your IP Network.

So if you have an /24 netmask in a network e.g. 192.168.78.* the broadcast is 192.168.78.255

Therefore the filter would be: !(ip.addr==192.168.78.255)

of course, you can also use matches filter, which does not need to define the network address like "192.168.78." :

"!(ip.host matches ".255$")" for a /24 network.

Hope this helps Cheers Henrik