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Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD

Previous thread: Re: Sub-interfaces by Eric W. Bates on Friday, April 14, 2006 - 7:53 am. (2 messages)

Next thread: TCP Westwood implemented? by Kan Cai on Sunday, April 16, 2006 - 7:02 pm. (1 message)
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From: Yeow C.H.
Subject: Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD
Date: Sunday, April 16, 2006 - 8:02 am

For those who are interested with this libpcap based networking suite,  please do check out Bit-Twist 0.7, development release here:
  1. http://bittwist.sourceforge.net/ (Bit-Twist homepage)
  2. http://sourceforge.net/projects/bittwist/ (SF.net project page)
  
    Bit-Twist is a simple and powerful libpcap-based Ethernet II (IEEE 802.3) 
    packet generator that comes complete with a comprehensive pcap capture file 
    editor and a multiport link speed capability Ethernet bridge! 
     
    It is designed to compliment tcpdump, which by itself has done a great job 
    in capturing network traffic. With Bit-Twist, you can now regenerate the 
    captured traffic onto a live network. Packets are generated from saved tcpdump 
    capture file (trace file). 
     
    Bit-Twist also comes with a comprehensive trace file editor to allow you to 
    change the contents of a trace file. You can also append your own payload to 
    each packet in the trace file (IP/TCP/UDP/ICMP header checksum is corrected 
    automatically). 
     
    Although packet generator is generally useful for simulating networking traffic, 
    testing firewall/IDS/IPS, or troubleshooting various network problems, Bit-Twist 
    (together with tcpdump) has also proven itself to be useful for educational  
    purposes especially in Computer Network classes. As with most of the existing 
    packet generators, this is not immediately trivial (e.g. many times, they are  
    complex, huge, and overloaded with features). Bit-Twist prevails here with its 
    simplicity in its implementation, usage, and deployment which helps cut the  
    learning curve of students' and general users alike. 
     
    Currently, Bit-Twist compiles on *BSD and Linux and it works under Ethernet II 
    (802.3) network with a MTU of up to 1500 bytes on 10Mbps (10Base-T Ethernet) or 100Mbps (Fast Ethernet) link speed.
  
		
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From: Brian Candler
Subject: Re: Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD
Date: Monday, April 17, 2006 - 5:43 am

Interesting - how does it differ from /usr/ports/net-mgmt/tcpreplay ?

Regards,

Brian.
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From: Yeow C.H.
Subject: Re: Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD
Date: Monday, April 17, 2006 - 6:34 am

Thanks Brian.
  
  Simply put Bit-Twist is smaller, do more, medium specific (Ethernet II - IEEE 802.3) suite.
  
  Bittwist (packet generator) does not differs much from tcpreplay  program. I would admit if you say tcpreplay can do everything that  bittwist can do. But bittwist implementation is much simpler and it  uses only libpcap library without libnet dependency.
  
  Its capture file editor, bittwiste, allow you to change most fields in  Ethernet, ARP, IP, ICMP, TCP, and UDP headers and you can specify your  own payload. It is possible for the payload to cover the ICMP, TCP, or  UDP header itself (checksum is corrected automatically). Tcprewrite  (part of Tcpreplay suite) allows you to change src/dst MAC/IP/port  only, but, it supports VLAN frames (Bit-Twist does not).
  
  Bittwistb (bridge) aids the injection of packets from an end host which  get forwarded across different LAN segments. It supports multiple ports  (up to 8, or more if you want it to). Tcpbridge supports only 2.
  
  Simply put, Bit-Twist is created not to compete with any existing  similar projects, i.e. Tcpreplay, but it is here in favor of freedom of  choice :) and also, Bit-Twist is currently being used as a practical  teaching material in Computer Network classes.


Interesting - how does it differ from /usr/ports/net-mgmt/tcpreplay ?

Regards,

Brian.


		
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From: Wesley Shields
Subject: Re: Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD
Date: Tuesday, April 18, 2006 - 12:57 pm

There is now a port for this available at net/bittwist if anyone is
interested in playing with it further.  It doesn't build under 4.x due
to a redefinition of in_addr_t and a lack of round(), but it builds
under more recent versions.  :)

-- WXS
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From: Mark Allman
Subject: Re: Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD
Date: Thursday, April 20, 2006 - 4:26 am

I haven't tried either one of these, but will note that my favorite
program in this space - if one wants to hack interactively - is
"netdude", which is available from sourceforge.  FWIW.

allman




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Previous thread: Re: Sub-interfaces by Eric W. Bates on Friday, April 14, 2006 - 7:53 am. (2 messages)

Next thread: TCP Westwood implemented? by Kan Cai on Sunday, April 16, 2006 - 7:02 pm. (1 message)