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Code Editor : randpkt.html

<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>randpkt - The Wireshark Network Analyzer 1.10.14</title>
<link rel="stylesheet" href="../docbook/ws.css" type="text/css" />
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rev="made" href="mailto:root@localhost" />
</head>

<body>

randpkt - Random Packet Generator

<h1 id="SYNOPSIS">SYNOPSIS</h1>

randpkt [ -b &lt;maxbytes&gt; ] [ -c &lt;count&gt; ] [ -t &lt;type&gt; ] &lt;filename&gt;

<h1 id="DESCRIPTION">DESCRIPTION</h1>

randpkt is a small utility that creates a pcap trace file full of random packets.

By creating many randomized packets of a certain type, you can test packet sniffers to see how well they handle malformed packets. The sniffer can never trust the data that it sees in the packet because you can always sniff a very bad packet that conforms to no standard. randpkt produces very bad packets.

When creating packets of a certain type, randpkt uses a sample packet that is stored internally to randpkt. It uses this as the starting point for your random packets, and then adds extra random bytes to the end of this sample packet.

For example, if you choose to create random ARP packets, randpkt will create a packet which contains a predetermined Ethernet II header, with the Type field set to ARP. After the Ethernet II header, it will put a random number of bytes with random values.

<h1 id="OPTIONS">OPTIONS</h1>

<dl>

<dt id="b-maxbytes">-b &lt;maxbytes&gt;</dt>
<dd>

Default 5000.

Defines the maximum number of bytes added to the sample packet. If you choose a maxbytes value that is less than the size of the sample packet, then your packets would contain only the sample packet... not much variance there! randpkt exits on that condition.

</dd>
<dt id="c-count">-c &lt;count&gt;</dt>
<dd>

Default 1000.

Defines the number of packets to generate.

</dd>
<dt id="t-type">-t &lt;type&gt;</dt>
<dd>

Default Ethernet II frame.

Defines the type of packet to generate:

<pre>

<pre><code> arp Address Resolution Protocol
 bgp Border Gateway Protocol
 bvlc BACnet Virtual Link Control
 dns Domain Name Service
 eth Ethernet
 fddi Fiber Distributed Data Interface
 giop General Inter-ORB Protocol
 icmp Internet Control Message Protocol
 ip Internet Protocol
 llc Logical Link Control
 m2m WiMAX M2M Encapsulation Protocol
 megaco MEGACO
 nbns NetBIOS-over-TCP Name Service
 ncp2222 NetWare Core Protocol
 sctp Stream Control Transmission Protocol
 syslog Syslog message
 tds TDS NetLib
 tcp Transmission Control Protocol
 tr Token-Ring
 udp User Datagram Protocol
 usb Universal Serial Bus
 usb-linux Universal Serial Bus with Linux specific header</code></pre>

</pre>

</dd>
</dl>

<h1 id="EXAMPLES">EXAMPLES</h1>

To see a description of the randpkt options use:

<pre><code> randpkt</code></pre>

To generate a capture file with 1000 DNS packets use:

<pre><code> randpkt -b 500 -t dns rand_dns.pcap</code></pre>

To generate a small capture file with just a single LLC frame use:

<pre><code> randpkt -b 100 -c 1 -t llc single_llc.pcap</code></pre>

pcap(3), editcap(1)

</body>

</html>

${this.title}

Code Editor : randpkt.html