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= randpkt(1)
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randpkt - Random packet generator
[ *-b* <maxbytes> ]
[ *-c* <count> ]
[ *-t* <type> ]
*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.
-b <maxbytes>::
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.
-c <count>::
Default 1000.
Defines the number of packets to generate.
-t <type>::
Default Ethernet II frame.
Defines the type of packet to generate:
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
ipv6 Internet Protocol Version 6
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
To see a description of the randpkt options use:
To generate a capture file with 1000 DNS packets use:
randpkt -b 500 -t dns rand_dns.pcap
To generate a small capture file with just a single LLC frame use:
randpkt -b 100 -c 1 -t llc single_llc.pcap
xref:[pcap](3), xref:editcap.html[editcap](1)