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Subject: 2. Using Capture Filters - 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"chapter"><div class=3D"titlepage"><div><div><h1 c=
lass=3D"title"><a id=3D"ch10"></a>Chapter 2. Using Capture Filter=
s</h1></div></div></div><p>In this chapter, we will cover the following top=
ics:</p><div class=3D"itemizedlist"><ul class=3D"itemizedlist"><li class=3D=
"listitem" style=3D"list-style-type: disc">Configuring capture filters</li>=
<li class=3D"listitem" style=3D"list-style-type: disc">Configuring Ethernet=
filters</li><li class=3D"listitem" style=3D"list-style-type: disc">Configu=
ring hosts and networks filters</li><li class=3D"listitem" style=3D"list-st=
yle-type: disc">Configuring TCP/UDP and port filters</li><li class=3D"listi=
tem" style=3D"list-style-type: disc">Configuring compound filters</li><li c=
lass=3D"listitem" style=3D"list-style-type: disc">Configuring byte-offset a=
nd payload matching filters</li></ul></div><div class=3D"section"><div clas=
s=3D"titlepage"><div><div><h1 class=3D"title"><a id=3D"ch02lvl1sec017"></a>=
Introduction</h1></div></div></div><p>In the first chapter we talked about =
how to install Wireshark, how to configure it for basic operations, and whe=
re to locate it in the network. In this chapter and the next one we will ta=
lk about capture filters (<a class=3D"link" href=3D"https://learning.oreill=
y.com/library/view/wireshark-revealed-essential/9781788833226/ch10.html">Ch=
apter 2</a>, <span class=3D"emphasis"><em>Using Capture Filters</em></span>=
) and display filters (<a class=3D"link" href=3D"https://learning.oreilly.c=
om/library/view/wireshark-revealed-essential/9781788833226/ch11.html">Chapt=
er 3</a>, <span class=3D"emphasis"><em>Using Display Filters</em></span>).<=
/p><p>It is important to distinguish between these two types of filters:</p=
><div class=3D"itemizedlist"><ul class=3D"itemizedlist"><li class=3D"listit=
em" style=3D"list-style-type: disc">Capture filters are <a id=3D"id0134" cl=
ass=3D"indexterm"></a>configured before we start to capture data, so only d=
ata that is approved with the filters will be captured. All other data will=
be lost. These filters are described in this chapter.</li><li class=3D"lis=
titem" style=3D"list-style-type: disc">Display filters are filters <a id=3D=
"id0135" class=3D"indexterm"></a>that filter data after it has been capture=
d. In this case, all data is captured, and you configure what data you wish=
to display. These filters are described in <a class=3D"link" href=3D"https=
://learning.oreilly.com/library/view/wireshark-revealed-essential/978178883=
3226/ch11.html">Chapter 3</a>, <span class=3D"emphasis"><em>Using Display F=
ilters</em></span>.</li></ul></div><div class=3D"tip" style=3D""><div class=
=3D"inner"><h3 class=3D"title"><a id=3D"tip005"></a>Tip</h3><p>Capture filt=
ers are based on the <code class=3D"literal">tcpdump</code> syntax presente=
d in the <code class=3D"literal">libpcap</code>/<code class=3D"literal">Win=
Pcap</code> library, while the display filters syntax was presented some ye=
ars later. Therefore, keep in mind that the display and capture filters hav=
e different syntaxes!</p></div></div><p>In some cases, you need to configur=
e Wireshark to capture only a part of the data that it sees over the interf=
ace, for example, cases such as:</p><div class=3D"itemizedlist"><ul class=
=3D"itemizedlist"><li class=3D"listitem" style=3D"list-style-type: disc">Wh=
en there is a large amount of data running over the monitored link, and you=
want to capture only the data you care about</li><li class=3D"listitem" st=
yle=3D"list-style-type: disc">When you want to capture data only going in a=
nd out of a specific server on a VLAN that you monitor</li><li class=3D"lis=
titem" style=3D"list-style-type: disc">When you want to capture data only o=
f a specific application or applications (for example, you suspect that the=
re is a DNS problem in the network, and you want to analyze only DNS querie=
s and responses that go to and from the Internet)</li></ul></div><p>There a=
re many other cases in which you want to capture only specific data and not=
all that runs on your network. When using the capture filters, only predef=
ined data will be captured, and all other packets will be ignored, so you w=
ill get only the desired data.</p><div class=3D"tip" style=3D""><div class=
=3D"inner"><h3 class=3D"title"><a id=3D"tip006"></a>Tip</h3><p>Be careful w=
hen using capture filters. In many cases in networking, there are dependenc=
ies between different applications and servers that you are not always awar=
e of; so, when you use Wireshark with capture filters for troubleshooting a=
network, make sure that you don't filter out some of the connections that =
will cause some problems to disappear. A common and simple example of this =
is to filter only traffic on TCP port 80 for monitoring suspected slow HTTP=
responses, while the problem could be due to a slow or non-responsive DNS =
server that you will not see.</p></div></div><p>In this chapter we will des=
cribe how to configure simple, structured, byte offset, and payload matchin=
g capture filters.</p></div></div><div class=3D"annotator-outer annotator-v=
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