Wireshark · Wireshark-users: Re: [Wireshark-users] Display Filter L3 Broadcasts

[Martin Visser <martinvisser99@xxxxxxxxx>]

If you just want the last octet of the destination IP address to be 255 (but not 255.255.255.255) then try

"!(ip[16:3] == FF:FF:FF) && ip[19] == FF"

alternatively to just select those destination address in the 192.168.0.0/16 network, with the last octet being 255 then 

"ip.dst == 192.168.0.0/16  && ip[19] == FF"

Pick which ever one seems to make more sense (the first is more general and useful in say 10.x networks)

Regards, Martin

MartinVisser99@xxxxxxxxx

On Wed, Oct 21, 2009 at 7:25 PM, Keith French <keithfrench@xxxxxxxxxxxxx> wrote:

No that will only display all packets with  ip addresses in those subnets, I
only want to see the Layer 3 broadcasts (x.x.x.255) from those subnets.


--------------------------------------------------
From: "Wes" <wes_r@xxxxxxxxx>
Sent: Tuesday, October 20, 2009 11:03 PM
To: "Community support list for Wireshark" <wireshark-users@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-users] Display Filter L3 Broadcasts

> Try:
>
> ip.addr == 192.168.1.0/24
>
> or whatever mask size you like.
>
> Wes
>
> --- On Tue, 10/20/09, Keith French <keithfrench@xxxxxxxxxxxxx> wrote:
>
>> From: Keith French <keithfrench@xxxxxxxxxxxxx>
>> Subject: [Wireshark-users] Display Filter L3 Broadcasts
>> To: "Wireshark-Users" <wireshark-users@xxxxxxxxxxxxx>
>> Date: Tuesday, October 20, 2009, 5:45 PM
>>
>>
>>
>>
>>
>>
>>
>> I want to use a display
>> filter to show the Layer 3
>> broadcasts for a range of subnets. The sort of thing I am
>> after is to show all
>> broadcasts for these subnets (assuming a 24 bit
>> mask):-
>>
>> 192.168.0.255
>> 192.168.1.255
>> 192.168.2.255
>> etc
>>
>> So what I am really after
>> is some sort of wild card
>> like:-
>>
>> ip.addr eq
>> x.x.x.255
>>
>> I am not interested in the
>> all subnet broadcast
>> address of 255.255.255.255.
>>
>> How can I filter on these
>> subnet
>> broadcasts?
>>
>> Keith French.
>>
>>
>>
>>
>> -----Inline Attachment Follows-----
>>
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