Packet Sender is an open source utility to allow sending and receiving TCP, UDP, and SSL (encrypted TCP) packets as well as HTTP/HTTPS requests and panel generation. The mainline branch officially supports Windows, Mac, and Desktop Linux (with Qt). Other places may recompile and redistribute Packet Sender. Packet Sender is free and licensed GPL v2 or later. It can be used for both commercial and personal use. If you find the app useful, please consider donating/sponsoring so development may continue.
Packet Sender would like to thank the following sponsors.
NOTE: Try (temporarily) disabling your firewall if having problems in Windows.
Official releases of Packet Sender can be downloaded at PacketSender.com. Some places redistribute Packet Sender.
The iOS version is located on the Apple App Store
Packet Sender is identical for all the desktop versions. The only difference is its theme to match the operating system.
The fields at the top can be navigated using CTRL+1, CTRL+2, etc, up to CTRL+8 (send button). On Mac, the shortcut key is Command.
The hotkeys and fields are:
Packet Sender's built-in servers are configured to support either IPv4 or IPv6 but not both at the same time. For clients, Packet Sender GUI and CLI will seamlessly switch between the two modes upon sending (scope ID may be needed for IPv6). Click the IPv4 / IPv6 toggle on the bottom right to switch between the two.
Inside the settings, you may also force Packet Sender's servers to bind to a custom IP address. This can be very useful for systems with multiple NICs or complicated IP setups. Packet Sender will trigger an error if told to bind to an address that does not exist.
Packet Sender has a built-in subnet calculator. It is under the Tools menu.
Packet Sender supports establishing encrypted connections over SSL. This is supported in the GUI and on the command line.
Packet Sender bundles OpenSSL for use in Windows. On Mac and Linux, Packet Sender will use the native SSL libraries.
This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit. (http://www.openssl.org/)
Packet Sender bundles an internal "Snake Oil" certificate for use as a server for Windows. The certificate and key is in the same place as packet and settings.
Note: Overriding the cert locations in Settings also overrides the snake-oil certificate.
If there is an SSL error, Packet Sender will output it to the traffic log. If the setting is to continue anyway (default), it will continue to negotiate encryption. Otherwise, the connection ends with failure to connect.
Packet Sender's multicast support is triggered by attempting to send to a IPv4 multicast address or from the mulitcast submenu. The feature is currently experimental and has these known problems.
There is no IPv6 multicast support, though it is on the roadmap. Sponsors wanting IPv6 multicast support are welcome to contact me.
For when the normal send system is not enough, you can hammer a target IP with packets to see if your device can handle it. This can be found in the GUI toolbar at Tools -> Intense Traffic Generator
Please note that this feature is experimental and the metrics displayed have not been fully tested. For a more accurate test, you may want to look at the CLI version of this tool.
Packet sets can be quickly saved/retrieved/shared using the free Packet Sender Cloud service. The cloud may also be used to publicly display and distribute your packets (via an URL) for collaboration, tutorials, end users, etc. Packet Sender may import public packet sets with public URL.
There are various reasons to do this:
If you are publishing a network API, maintaining a public cloud page is significantly easier than painfully detailing (IP, port, type, etc) the packets to your users. Plus, updating that page is easy.
More information about it can be found at https://cloud.packetsender.com/help
Packet Sender has a "portable" mode. At launch, it will look for
portablemode.txt and populate any missing settings files in that run-time directory. These files are
You may also have some files portable and the other in their standard location by removing portablemode.txt.
The run-time directory Windows users is the same place as the .exe.
For MAC users, this run-time directory is at
If INI files are found, it will use them instead of
Packet Sender supports up to 5 smart responses.
To enable this feature, go to File -> Settings at the GUI toolbar. Go to the Smart Responses tab and enable the Send a Smart Response checkbox.
Packet Sender supports these macros when sending responses:
Packet Sender supports persistent TCP and SSL connections via a separate GUI window. It is enabled by a checkbox on the main window or through the Settings window.
Persistent connections are not supported via the command line.
Packet Sender supports sending POST/GET requests via HTTP and HTTPS. Protocol dropdown includes the following options: HTTP GET, HTTP POST, HTTPS GET, HTTPS POST. When selecting HTTP(S), input fields will udpate to: Name, Request, Address, Data (when POST is selected), Generate Data button (when POST is selected), Load FIle (when POST is selected).
You may also paste a complete URL in the Request field and Packet Sender will parse and auto-populate the other fields.
Packet Sender supports generating control panels. Panels consist of buttons with scripts (packets) assigned to them. Clicking the button will execute the packet(s) referenced on that button.
Panels can be created one of two ways:
To begin scripting the buttons on your panel, you will need to open a panel and go to the Editing screen. Once a panel project is opened, check the button in the bottom right corner. If this button says "Viewing", you are on the Viewing screen. Click the button to move the panel to the Editing screen.
Once at the Editing screen, buttons and scripts can be added to the panel.
Button scripts will contain the name of the packet to be sent.
Multiple packets can be set to a button by adding each name on a new line.
Panel Generator supports adding a delay between multiple packets by adding "delay:# of seconds" in between packets.
Panel Generator supports adding a script to load a new panel by adding "panel:panel id #". Once all previous scripts on the button are executed, the Panel will transition to the next panel.
Panel Generator supports adding buttons that link to locally-stored files or URLs. File/URL buttons can be added while in the Editing screen by clicking the + in the bottom right corner.
Once the file or URL is copied, you will be prompted to input a name for the button. Buttons will populate at the bottom of the panel.
While on the Editing screen, clicking these buttons will allow you to edit the file/URL link and the name of the button. You can also delete the button by clicking the X on the popup.
When on the Viewing screen, clicking these buttons will launch the URL in the default browser or open the file (with the default program for the file type).
While in the Editing screen of a Panel, there will be a toolbar with menus File, Export, Settings, Help. You can save, export, import, load panel projects, and edit the current panel project from this toolbar.
From Settings, you can do the following:
Packet Sender can be used from the command line on your computer.
For Windows, use the extension .com (
packetsender.com) to use the command line interface. Optionally, you can also use
packetsender without an extension. Using the extension .exe will launch the GUI.
For Linux, the command line system in Packet Sender follows the same pattern as other Linux utilities. It has a long name (such as --version) and a short name (such as -v). These options can be arranged in any order and Packet Sender will parse them correctly. The last 3 options are positional and must appear last. They are IP, port, and data. These last options are optional if using a stored packet.
packetsender --help Usage: packetsender [options] address port data Packet Sender is a Network UDP/TCP/SSL Test Utility by NagleCode See https://PacketSender.com/ for more information. Options: -?, -h, --help Displays help on commandline options. --help-all Displays help including Qt specific options. -v, --version Displays version information. -q, --quiet Quiet mode. Only output received data. -x, --hex Parse data-to-send as hex (default). -a, --ascii Parse data-to-send as mixed-ascii (like the GUI). -A, --ASCII Parse data-to-send as pure ascii (no \xx translation). -w, --wait <ms> Wait up to <milliseconds> for a response after sending. Zero means do not wait (Default). -f, --file <path> Send contents of specified path. Max 10 MiB for UDP, 100 MiB for TCP/SSL. -b, --bind <port> Bind port. Default is 0 (dynamic). -6, --ipv6 Force IPv6. Same as -B "::". Default is IP:Any. -4, --ipv4 Force IPv4. Same as -B "0.0.0.0". Default is IP:Any. -B, --bindip <IP> Bind custom IP. Default is IP:Any. -t, --tcp Send TCP (default). -s, --ssl Send SSL and ignore errors. -S, --SSL Send SSL and stop for errors. -u, --udp Send UDP. --http Send HTTP. -n, --name <name> Send previously saved packet named <name>. Other options overrides saved packet parameters. --bps <bps> Intense traffic. Calculate rate based on value of bits per second. --num <number> Intense traffic. Number of packets to send. Default unlimited. --rate <Hertz> Intense traffic. Rate. Ignored in bps option. --usdelay <microseconds> Intense traffic. Resend delay. Used if rate is 0. Ignored in bps option. Arguments: address Destination address/URL. Optional for saved packet. port Destination port/POST data. Optional for saved packet. data Data to send. Optional for saved packet or HTTP.
The CLI follows the same format between Windows, Linux, and MAC.
The format is:
packetsender [options] address port data
packetsender -taw 500 mirrors.xmission.com 21 "USER anonymous\r\nPASS [email protected]\r\n" TCP (65505)://mirrors.xmission.com:21 55 53 45 52 20 61 6e 6f 6e 79 6d 6f 75 73 0d 0a 50 41 53 53 20 63 68 72 6f 6d 65 40 65 78 61 6d 70 6c 65 2e 63 6f 6d 0d 0a Response Time:5:51:37.042 pm Response HEX:32 32 30 2D 57 65 6C 63 6F 6D 65 20... Response ASCII:220-Welcome to XMission Internet...
Packet Sender command line can bind to custom ports to force IPv4/6 modes or multiple NIC using the -B option.
packetsender -taw 3000 fe80::c07b:d517:e339:5a08 5005 "Hello\r" packetsender -taw 3000 192.168.0.201 5005 "Hello\r" packetsender -B 192.168.0.200 -taw 3000 192.168.0.201 5005 "Hello\r" packetsender -B fe80::a437:399a:3091:266a%ethernet_32769 -taw 3000 fe80::c07b:d517:e339:5a08 5005 "Hello\r" packetsender -B fe80::a437:399a:3091:266a -taw 3000 fe80::c07b:d517:e339:5a08 5005 "Hello\r"
The command line has the option to ignore or abandon on SSL errors. The default is to ignore.
packetsender -saw 500 expired.packetsender.com 443 "GET / HTTP/1.0\r\n\r\n" SSL Error: The certificate has expired SSL (54202)://expired.packetsender.com:443 47 45 54 20 2f 20 48 54 54 50 2f 31 2e 30 0d 0a 0d 0a Cipher: Encrypted with AES(128) Response Time:3:24:55.695 pm Response HEX:48 54 54 50 2f 31 2e 31 20 34 32 31 20 0d 0a 53 65 72 76 65 72 3a 20 6e 67 69 6e 78 2f 31 2e 31 30 2e 30 20 28 55 62 75 6e 74 75 29 0d Response ASCII:HTTP/1.1 421 \r\nServer: nginx/1.10.0 (Ubuntu)\r
The command intense traffic generator works much the same way as the GUI version but it is a bit more accurate, with more control options, (and more intensity!).
See below for examples how to use it. Note that these calculations are "Best Effort". It does OK, but processor spikes or various network hiccups can throw it off. The threading is not real-time, and is not super-smart with its attempts to compensate.
Note: For Windows, use the ".com" build, so each example would be packetsender.com
packetsender --rate 20 --name "My Awesome Packet" packetsender --bps 2000 --name "My Awesome Packet" packetsender --rate 0 --name "My Awesome Packet" packetsender --usdelay 2000000 --name "My Awesome Packet"
The only dependency is Qt SDK
The Windows and Mac versions were built using Qt 5.12. Packet Sender does support Qt 6, however it does not support cmake.
Here is the sequence of commands for Ubuntu 16.04. Please adapt to your Linux platform. Packet Sender requires no additional libraries beyond the stock Qt SDK. I have been told there are build issues with stock Fedora. If a Fedora wizard has insight, please let me know, and I'll add your instructions.
If you are feeling adventurous, feel free to build from the master branch. It contains the latest stable build. The development branch should probably be avoided.
sudo apt-get update sudo apt-get install qt5-default build-essential wget https://github.com/dannagle/PacketSender/archive/(Version).tar.gz tar -xzvf (Version).tar.gz cd PacketSender-(Version)/src qmake PacketSender.pro make
To run use:
If it doesn't run, you may need to set it executable
chmod a+x PacketSender
Missing a feature? You can hire me to add it to Packet Sender.
GPL v2 or Later. Contact me if you require a different license.