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    netsniff-ng is a free Linux network analyzer and networking toolkit originally written by Daniel Borkmann. Its gain of performance is reached by zero-copy mechanisms for network packets (RX_RING, TX_RING), so that the Linux kernel does not need to copy packets from kernel space to user space via system calls such as recvmsg(). libpcap, starting with release 1.0.0, also supports the zero-copy mechanism on Linux for capturing (RX_RING), so programs using libpcap also use that mechanism on Linux.


    Overview


    netsniff-ng was initially created as a network sniffer with support of the Linux kernel packet-mmap interface for network packets, but later on, more tools have been added to make it a useful toolkit such as the iproute2 suite, for instance. Through the kernel's zero-copy interface, efficient packet processing can be reached even on commodity hardware. For instance, Gigabit Ethernet wire-speed has been reached with netsniff-ng's trafgen. The netsniff-ng toolkit does not depend on the libpcap library. Moreover, no special operating system patches are needed to run the toolkit. netsniff-ng is free software and has been released under the terms of the GNU General Public License version 2.
    The toolkit currently consists of a network analyzer, packet capturer and replayer, a wire-rate traffic generator, an encrypted multiuser IP tunnel, a Berkeley Packet Filter compiler, networking statistic tools, an autonomous system trace route and more:

    netsniff-ng: a zero-copy analyzer, packet capturer and replayer, itself supporting the pcap file format
    trafgen: a zero-copy wire-rate traffic generator
    mausezahn: a packet generator and analyzer for HW/SW appliances with a Cisco-CLI
    bpfc: a Berkeley Packet Filter (BPF) compiler
    ifpps: a top-like kernel networking statistics tool
    flowtop: a top-like netfilter connection tracking tool with Geo-IP information
    curvetun: a lightweight multiuser IP tunnel based on elliptic-curve cryptography
    astraceroute: an autonomous system trace route utility with Geo-IP information
    Distribution specific packages are available for all major operating system distributions such as Debian or Fedora Linux. It has also been added to Xplico's Network Forensic Toolkit, GRML Linux, Security Onion, and to the Network Security Toolkit. The netsniff-ng toolkit is also used in academia.


    Basic commands working in netsniff-ng


    In these examples, it is assumed that eth0 is the used network interface.
    Programs in the netsniff-ng suite accept long options, e.g. --in ( -i ), --out ( -o ), --dev ( -d ).

    For geographical AS TCP SYN probe trace route to a website:
    astraceroute -d eth0 -N -S -H ⟨host e.g., netsniff-ng.org⟩
    For kernel networking statistics within promiscuous mode:
    ifpps -d eth0 -p
    For high-speed network packet traffic generation, trafgen.txf is the packet configuration:
    trafgen -d eth0 -c trafgen.txf
    For compiling a Berkeley Packet Filter fubar.bpf:
    bpfc fubar.bpf
    For live-tracking of current TCP connections (including protocol, application name, city and country of source and destination):
    flowtop
    For efficiently dumping network traffic in a pcap file:
    netsniff-ng -i eth0 -o dump.pcap -s -b 0


    Platforms


    The netsniff-ng toolkit currently runs only on Linux systems. Its developers decline a port to Microsoft Windows.


    See also


    Comparison of packet analyzers
    OpenVPN
    Packet generator
    Tcpdump
    Traceroute
    Traffic generation model
    Wireshark
    Xplico


    References




    External links


    Official netsniff-ng website
    netsniff-ng FAQ
    netsniff-ng at GitHub
    netsniff-ng mailing list archive
    Linux' packet mmap(), BPF, and the netsniff-ng toolkit, talk at DevConf (long)
    Packet sockets, BPF, netsniff-ng, talk at OpenSourceDays (short)
    netsniff-ng(8) – Linux Administration and Privileged Commands Manual

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netsniff-ng · GitHub

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