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nGREP is a software program that can be used to search through packet captures for any number of different types of data packets. nGREP is not a network sniffer: it doesn’t try to pass on traffic that is not targeted to it. If you want to inspect traffic in a LAN while it’s passing through to a remote computer, you will need a sniffer such as tcpdump or Wireshark. nGREP is instead a tool that can analyze packet traffic to help you understand what data is being passed over a network.
The program works well with packet captures produced with the pcap(1) utility and associated tools; nGREP will not analyze traffic captured through interfaces like loopback, and will not analyze traffic captured through TAP-equipped routers. nGREP can work with captures produced with programs like tcpdump and wireshark, and with captures produced by tools such as tcpflow and tshark.
To use nGREP, start with a pcap capture file that contains packet data. It can be a file produced by one of the above tools, or a file produced by the nGREP -e command.
In a capture file created with the command line tools, each packet has a byte header that contains information about the packet’s contents, a 32-bit flags field and a 32-bit packet length. The byte header is followed by the packet data itself, which is in some cases variable-length.
The byte header consists of two six-byte fields, the major protocol and the minor protocol. The minor protocol identifies the type of data packet, and the major protocol identifies the payload type of data contained in the packet. The major protocol may also include a protocol-specific header, such as an IPv6 header in the case of IPV6 traffic, or an HTTP header in the case of HTTP traffic.
Because the data stream is variable-length, the capture file doesn’t contain any way of knowing the length of the data payload, so nGREP will start its search with the data in the first byte of the capture file, and continue to examine bytes in the capture file until it has examined every byte that represents the data payload.
Start by specifying the protocol that you are interested in:
ngrep -e protocol
ngrep will perform an initial scan of the first few bytes in the file, looking for matches. If the file contains more than one data packet of the same protocol, ngrep will perform a separate scan for each.
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ngrep is a free tool developed to help network administrators identify and analyze network problems by viewing and capturing packets at the IP level on active, connected interfaces. It has been built with security in mind and is easily applied against anything related to network connectivity. No specialized knowledge is required to operate it, just command line experience.
ngrep can capture packets at the IP level, allowing for the basic identification and analysis of protocol flows. It will operate on the currently active or default interface, and can optionally be run in the background with the -b option. An interface can be selected via the -i option or by selecting the name of the interface in the interface list.
ngrep will show the IP, port, source and destination addresses of the packets it sees, along with various quality of services and network statistics if applicable. Optionally, it will show the captured packet in hexadecimal format if the -p option is provided. Additional options allow the user to specify how much of the packet is to be captured or which of the packet’s headers to use to identify the packet.
ngrep also supports the use of extended regular expressions (EREs) to match payloads of individual packets. Furthermore, it supports extended hexadecimal expression for matches such as finding a string of digits followed by a colon and two more strings of digits.
ngrep was developed because of a lack of tool that could support these types of expressions. It was also created to make it easy to separate packets for later capture or analysis. For example, if one wanted to analyze TCP communication, they could wait and capture each of the packets separately by running ngrep -b -i eth0 or -i lo.
ngrep Configuration:
To configure ngrep you can provide it with configuration options in your configuration file(s) by using ini-style formatting.
[Note: the file contains your basic networking settings, including interfaces and addresses. The ini format is documented below. A full explanation of how to configure IPv6 and TCP/IPv4 networking is beyond the scope of this tutorial, but see the documentation on configuring and using ngrep for details.]
[Here, the nw_object.ini file is the primary configuration file used for the basic networking settings that are common to all interfaces. An interface can have multiple nw_object.ini files in which case each file will override all settings from all other files. In the default configuration, the only IPv6 and TCP/IPv4 networking information
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In order to understand how ngrep works, you must first understand a few things about layer 2 ethernet. Layer 2 ethernet is responsible for keeping packets organized, routing, error correction, etc. Typical layer 2 ethernet packets are encapsulated and contained in a layer 3 ethernet packet with the data payload of a layer 2 ethernet packet contained in the layer 3 ethernet packet. For clarity, consider the following definitions:
Layer 2 ethernet packet: The ethernet encapsulation layer, the one that contains the data.
Layer 3 ethernet packet: Layer 3 of the protocol stack, the one that contains the payload of layer 2 ethernet packets.
Data payload: Information being passed between a source and destination port.
Now, as previously stated, ngrep has the capability of analyzing layer 2 packets, which makes it a layer 2 packet analyzer. An example usage of ngrep would be to monitor the layer 2 ethernet packets on a serial link port in order to learn what data was received on the link. An example of a usage of ngrep would be to monitor a serial port and log the layer 3 packets that contain data about IP packets.
ngrep runs on Linux, macOS and Windows. The current version of ngrep is 1.27.
The current version of ngrep can analyze most 802.11 and 802.2 protocols, but to analyze 802.11v and 802.11g/n it requires root privileges on Linux and macOS, and admin privileges on Windows.
ngrep is free for use, so long as you only do good things.
How to Install ngrep on Linux
ngrep currently is available for both the 2.6.24 and 2.6.31 Linux kernel series (32-bit and 64-bit). For more information on installing ngrep on any version of Linux (including custom versions, such as CentOS, Debian, Ubuntu, Fedora, etc.), you can refer to the the ngrep website.
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What’s New in the Ngrep?
ngrep is generally useful for networking troubleshooting and protocol detection. It supports capturing packets and searching those captures for a wide variety of network protocols.
ngrep is based on libpcap, which is part of the pcap toolkit. More information on pcap/libpcap is available on the pcap website. This includes various HOWTOs, and the pcap and libpcap programs.
Features:
* May capture Ethernet, 802.11, PPP, FDDI, SLIP, Token Ring, and null-interface traffic
* Can sniff 802.11-style ad-hoc and infrastructure packets
* May capture and search TCP/IP, UDP/IP, ICMPv4/6, IGMP and Raw traffic
* Can sniff IPv4/6, TCP/IP, UDP/IP, ICMPv4/6, IGMP and Raw traffic using BCNF filter language
* Supports IP, IPv6 and MAC address filtering
* Manages custom filters in a file
* Supports the creation of pseudo-terminal files for use by tcpdump and sifts
* May read and reassemble pcap packets
* Can combine packets from multiple captures into a single pcap file
* May read and reassemble pcap packets using BPF.
* Extensive command-line options, including standard Unix tools and various extractors for parsing files.
* No special priveleges are needed to use ngrep, and it may be used in a chroot jail
Building:
The pcap-ng project has released source code and instructions for building a binary version of ngrep:
More detailed documentation about the requirements to build it, along with instructions, is available on the ngrep website:
ngrep is distributed under a General Public License. For more information, see the GPL.
While the General Public License is a permissive license, the pcap-ng project will release a new revision of ngrep incorporating the OpenBSD Porting Guidelines as soon as they are available.
If you wish to compile the ngrep source under the assumption that the porting guidelines have been followed, you will have to pass the -D_OPENBSD_PORTS define to the configure script, like so:
./configure -D_OPENBSD_PORTS
Building
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System Requirements For Ngrep:
PC: Intel Core i5-2400 or AMD FX-8320 required.
8 GB RAM recommended.
Windows 7/8/10 (64 bit)
NVIDIA GTX 650 or AMD HD 7870
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