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<h2>BPF Filters</h2>
<h3>Class Filter</h3><span style="font-weight: bold;">Allow you to
create BPF filters. These may be applied to a trace (so as to select a subset of that trace's packets) using <span style="font-style: italic;">trace.conf_filter(),</span> or to an individual packet using <span style="font-style: italic;">packet.apply_filter().</span><br style="font-style: italic;" /><br /></span>
<table class="indent1"><tbody><tr><td class="heading" colspan="2">Class Methods</td>
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<td class="name methodwidth"><strong>filter()</strong><br />
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<td class="name descriptionwidth"><em>filter(filterString) -> aFilter</em></td>
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<td class="description">Creates a BPF filter that wil select packets
using the <span style="font-style: italic;">tcpdump-style</span>
filter experssion given in <span style="font-style: italic;">
filterString</span>. For example, 'udp port 53' selects DNS
packets. See the <span style="font-style: italic;">tcpdump</span>
man page for the filter expression syntax.
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<br />Nevil Brownlee<br />Mon, 27 Jan 14 (NZDT)
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