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From: <Saved by Blink>
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Subject: Filter Expression Buttons - Wireshark Revealed: Essential Skills for IT Professionals
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<div id=3D"sbo-rt-content" style=3D"transform: none;"><div class=3D"annotat=
or-wrapper"><div class=3D"section"><div class=3D"titlepage"><div><div><h1 c=
lass=3D"title"><a id=3D"ch03lvl1sec25"></a>Filter Expression Buttons</h1></=
div></div></div><a id=3D"id224" class=3D"indexterm"></a><p>Filter Expressio=
n Buttons are buttons you can create that are based on display filters; the=
se can be used to quickly apply previously-saved display filters to your ca=
pture data to identify network and application problems.</p><p>For example,=
to create a <span class=3D"strong"><strong>Filter Expression Button</stron=
g></span> option that displays just <a id=3D"id225" class=3D"indexterm"></a=
>
<span class=3D"strong"><strong>TCP SYN</strong></span>, <span class=3D"stro=
ng"><strong>SYN/ACK</strong></span>, <span class=3D"strong"><strong>FIN</st=
rong></span>, or <span class=3D"strong"><strong>RST</strong></span> packets=
<a id=3D"id226" class=3D"indexterm"></a> to <a id=3D"id227" class=3D"indext=
erm"></a>analyze the TCP<a id=3D"id228" class=3D"indexterm"></a> session <a=
id=3D"id229" class=3D"indexterm"></a>setup parameters, network round-trip =
delay times, and session terminations:</p><div class=3D"orderedlist"><ol cl=
ass=3D"orderedlist arabic"><li class=3D"listitem">Type the following displa=
y filter string into the <span class=3D"strong"><strong>Filter</strong></sp=
an> textbox on the <span class=3D"strong"><strong>Display Filter Bar</stron=
g></span>:<div class=3D"informalexample"><pre class=3D"programlisting">(tcp=
.flags&02 && tcp.seq=3D=3D0) || (tcp.flags&12 && t=
cp.seq=3D=3D0) || (tcp.flags.ack && tcp.seq=3D=3D1 && !tcp.=
nxtseq > 0 && !tcp.ack >1) || tcp.flags.fin =3D=3D 1 || tcp.=
flags.reset =3D=3D1</pre></div></li><li class=3D"listitem">Clicking on <spa=
n class=3D"strong"><strong>Apply</strong></span> will apply this filter to =
a capture that you have loaded so that you can confirm that it is working p=
roperly.</li><li class=3D"listitem">Then, click on <span class=3D"strong"><=
strong>Save</strong></span> and give the button a name, such as <code class=
=3D"literal">TCP Handshake</code> (as illustrated in the following screensh=
ot). Then, click on <span class=3D"strong"><strong>OK</strong></span>:<div =
class=3D"mediaobject"><img src=3D"https://learning.oreilly.com/library/view=
/wireshark-revealed-essential/9781788833226/graphics/4638OS_03_10.jpg" alt=
=3D"Filter Expression Buttons" width=3D"357" height=3D"129" data-mfp-src=3D=
"/library/view/wireshark-revealed-essential/9781788833226/graphics/4638OS_0=
3_10.jpg"></div></li></ol></div><p>The filter expression buttons you create=
will appear on the right-hand side of the initial controls in the display =
filter bar, as illustrated in the following screenshot:</p><div class=3D"me=
diaobject"><img src=3D"https://learning.oreilly.com/library/view/wireshark-=
revealed-essential/9781788833226/graphics/4638OS_03_11.jpg" alt=3D"Filter E=
xpression Buttons" width=3D"1055" height=3D"33" data-mfp-src=3D"/library/vi=
ew/wireshark-revealed-essential/9781788833226/graphics/4638OS_03_11.jpg"></=
div><p>The filter expression button definitions are stored in the preferenc=
es file for the profile you are using. You <a id=3D"id230" class=3D"indexte=
rm"></a>can edit the button display order, edit the name or filter syntax, =
or delete the buttons in Wireshark's Preferences window.</p><div class=3D"s=
ection"><div class=3D"titlepage"><div><div><h2 class=3D"title"><a id=3D"ch0=
3lvl2sec34"></a>Using the Expressions window button</h2></div></div></div><=
p>To the<a id=3D"id231" class=3D"indexterm"></a> right-hand side of the <a =
id=3D"id232" class=3D"indexterm"></a>textbox on the display filter toolbar =
is the <span class=3D"strong"><strong>Expression</strong></span> button. Cl=
icking on this button opens a <span class=3D"strong"><strong>Filter Express=
ion</strong></span> window that allows you to select a protocol and the ext=
ension to that protocol, one of the appropriate relation (comparison) opera=
tors, and assign a comparison value. Click on <span class=3D"strong"><stron=
g>OK</strong></span> to populate the display filter textbox with the result=
ant display filter syntax and then click on <span class=3D"strong"><strong>=
Apply</strong></span> to apply the filter.</p></div><div class=3D"section">=
<div class=3D"titlepage"><div><div><h2 class=3D"title"><a id=3D"ch03lvl2sec=
35"></a>Right-click menus on specific packet fields</h2></div></div></div><=
p>If you <a id=3D"id233" class=3D"indexterm"></a>right-click on a specific =
field in the <span class=3D"strong"><strong>Packet List</strong></span> or =
<span class=3D"strong"><strong>Packet Details</strong></span> panes, you ca=
n select the <span class=3D"strong"><strong>Apply as Filter</strong></span>=
or <span class=3D"strong"><strong>Prepare a Filter</strong></span> option =
and the required submenu option to create display filter syntax, as illustr=
ated in the following screenshot. This is a very quick way of creating disp=
lay filter syntax:</p><div class=3D"mediaobject"><img src=3D"https://learni=
ng.oreilly.com/library/view/wireshark-revealed-essential/9781788833226/grap=
hics/4638OS_03_12.jpg" alt=3D"Right-click menus on specific packet fields" =
width=3D"376" height=3D"120" data-mfp-src=3D"/library/view/wireshark-reveal=
ed-essential/9781788833226/graphics/4638OS_03_12.jpg"></div><p>If you are s=
electing a field and using the right-click functionality to create display =
filter syntax, it is usually better to use the <span class=3D"strong"><stro=
ng>Prepare a Filter</strong></span> option, which will allow you to edit th=
e syntax before clicking on <span class=3D"strong"><strong>Apply</strong></=
span> to apply the filter.</p><div class=3D"note" style=3D""><div class=3D"=
inner"><h3 class=3D"title"><a id=3D"note13"></a>Note</h3><p>Clicking on a p=
rotocol field in the <span class=3D"strong"><strong>Packet Details</strong>=
</span> pane results in that field and the display filter syntax that refle=
cts that field to be displayed in the bottom-left <span class=3D"strong"><s=
trong>Status</strong></span> bar field. This is very helpful for starting a=
display filter string that will use a particular field.</p></div></div></d=
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