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Is there a Wireshark filter that hides all broadcast packets.

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Apply a display filter that hides all broadcast packets, then search the Packet List pane for deauthentication packets.

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markava60
asked 2023-09-28 01:37:51 +0000
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Homework assignment?

Jaap's avatar Jaap (2023-09-28 04:59:12 +0000) edit
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Which OSI layer you looking for?

Mac Layer: MAC broadcast is ff:ff:ff:ff:ff:ff so 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

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Henrik
answered 2023-09-29 18:13:11 +0000, updated 2023-09-29 19:12:42 +0000
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And leave the filters for IPv6 as an exercise...

In a regex "." means 'any character except record separator' (\n).

André's avatar André (2023-09-29 20:22:03 +0000) edit
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IPv6 does not have really any broadcast mechanism,.. but you could exclude any relevant multicast addresses. If you would exclude "All Nodes Multicast Address" which is I guess "ff02::1" or ff01::1" this filter would work: !(ipv6.addr==ff02::1) and !(ipv6.addr==ff01::1) Cheers

Henrik's avatar Henrik (2023-10-01 11:02:46 +0000) edit
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