Date: Tue, 18 Apr 2006 14:57:25 -0500 From: Wesley Shields <wxs@csh.rit.edu> To: "Yeow C.H." <det_re@yahoo.com> Cc: freebsd-net@freebsd.org Subject: Re: Libpcap based: packet generator + capture file editor + bridge for IEEE802.3 on FreeBSD Message-ID: <20060418195725.GA30928@csh.rit.edu> In-Reply-To: <20060417133412.36079.qmail@web60120.mail.yahoo.com> References: <20060417124340.GA99978@uk.tiscali.com> <20060417133412.36079.qmail@web60120.mail.yahoo.com>
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On Mon, Apr 17, 2006 at 06:34:12AM -0700, Yeow C.H. wrote: > 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. 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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