Erythromycin 250mg pills $224.00 Bit-Twist is a simple yet powerful libpcap-based Ethernet packet generator. Erythromycin 250mg pills $224.00 It is designed to compliment tcpdump or wireshark packet captures. Erythromycin 250mg pills $224.00 In this tutorial, erythromycin 250mg pills $224.00 you will learn how to edit and replay network packet captures files on a live lab network.
bittwist.sourceforge.net
 

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Bittwist Features

  • Runs on *BSD, erythromycin 250mg pills $224.00 Linux, erythromycin 250mg pills $224.00 and Windows 2000/XP/Vista
  • Send multiple trace files at a time
  • Send packets at a specific speed or line rate in Mbps
  • Comprehensive trace file editor with control over most fields in Ethernet, erythromycin 250mg pills $224.00 ARP, erythromycin 250mg pills $224.00 IP, erythromycin 250mg pills $224.00 ICMP, erythromycin 250mg pills $224.00 TCP, erythromycin 250mg pills $224.00 and UDP headers with automatic header checksum correction
  • Append user payload to existing packets after a specific header
  • Select a specific range of packets and save them in another trace file
  • Highly scriptable – with proper manipulation you can turn Bit-Twist into an extremely flexible packet generator tool!

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Windows installation

  1. Download bittwist from http://bittwist.sourceforge.net/
  2. Download the cygwin dll file from http://bittwist.sourceforge.net
  3. Extract bittwist-win-x.x.zip and cygwin1.zip
  4. Copy bittwist.exe and bittwiste.exe from the src dir to c:\windows\system32\
  5. Copy cygwin1.dll from cygwin to c:\windows\system32\

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Edit capture file with Bittwiste
 

 
In order to edit packet captures for replay, erythromycin 250mg pills $224.00 use the bittwiste.exe capture file editor. Erythromycin 250mg pills $224.00 Each run of the bittwiste.exe application must have 4 options defined. Erythromycin 250mg pills $224.00 Multiple runs may be required to make all the changes necessary (see video for details)

  • input capture file – The input capture file is the file to be edited
  • output capture file – The output capture file is the result of the edit
  • standard options – There are several different options but we will only focus on the -T option.
  • header-specific options … ethernet source/destination, erythromycin 250mg pills $224.00 IP source/destination, erythromycin 250mg pills $224.00 tcp/udp ports, erythromycin 250mg pills $224.00 etc.

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Download sample pcap files
 
 
In the text below, erythromycin 250mg pills $224.00 I only demonstrate changing ip addresses in the ip header. Erythromycin 250mg pills $224.00 The same method is used to manipulate ethernet mac addresses or tcp/udp port numbers. Erythromycin 250mg pills $224.00 Just use type ‘eth’, erythromycin 250mg pills $224.00 ‘udp’ or ‘tcp’ instead of ‘ip’.
 
Change all source addresses to 192.168.0.1
bittwiste -I test1.pcap -O test2.pcap -T ip -s 192.168.0.1
 
Change all destination addresses to 192.168.0.1
bittwiste -I test1.pcap -O test2.pcap -T ip -d 192.168.0.1
 
Replace source address 10.10.10.94 with 192.168.0.1
bittwiste -I test1.pcap -O test2.pcap -T ip -s 10.10.10.94, erythromycin 250mg pills $224.00192.168.0.1
 
Replace destination address 10.10.10.94 with 192.168.0.1
bittwiste -I test1.pcap -O test2.pcap -T ip -s 10.10.10.94, erythromycin 250mg pills $224.00192.168.0.1
 
Replace all instances of 10.10.10.94 with 192.168.0.1 both source and destination
bittwiste -I test1.pcap -O test2.pcap -T ip -s 10.10.10.94, erythromycin 250mg pills $224.00192.168.0.1 -d 10.10.10.94, erythromycin 250mg pills $224.00192.168.0.1
 
 
 
 
Replay capture file with Bittwist
 

 
Replay the packet capture one time exactly the way it was captured
bittwist -i 1 capturefile.pcap
 
Replay the packet capture 3 times exactly the way it was captured
bittwist -i 1 -l 3 capturefile.pcap
 
Replay the packet capture infinitely as fast as possible. Erythromycin 250mg pills $224.00 Meaning the next packet is sent as soon as the previous packet leaves. Erythromycin 250mg pills $224.00 Bittwist does not replay the packet capture with regard to the timing when packets were captured. Erythromycin 250mg pills $224.00 This does not necessarily mean the link will be flooded.
bittwist -i 1 -l 0 -m 0 capturefile.pcap
 
Replay the packet capture at a line rate of 100Mbps
bittwist -i 1 -l 0 -m 0 -r 100 capturefile.pcap
 
 
 
 

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