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packetsender(1) Network utility for sending and receiving TCP, UDP, SSL packets packetsender(1)


packetsender - Network utility for sending and receiving TCP, UDP, SSL packets


packetsender [options] address port data


Packet Sender is a utility that sends and receives TCP, UDP and SSL (encrypted TCP) packets on the ports of your choosing. It supports IPv4 and IPv6 and provides a GUI for final users. However, is also possible use Packet Sender in text mode via command line.

Some features:

  • Can act as client/server to send and receive network traffic.
  • A payload can be created in ASCII or hex.
  • Command line mode is available for automation and scripting.
  • Packet Sender cloud is a disposable resource to be used to publicly display and distribute packets (via an URL) for collaboration, tutorials, end users, etc. Packet Sender may import public packet sets with public URL.

Some uses:

  • Control network-based devices in ways beyond their original apps.
  • Test automation (using command line tool and/or hotkeys).
  • Test network APIs (using the built-in TCP, UDP, SSL clients).
  • Malware analysis (using the built-in UDP, TCP, SSL servers).
  • Troubleshoot secure connections (using SSL).
  • Test network connectivity/firewalls (by having 2 Packet Senders talk to each other).
  • Stress-test a device (using intense network generator tool).
  • Tech support (by sending customers a portable Packet Sender with pre-defined settings and packets).
  • Share/Save/Collaborate using the Packet Sender Cloud service.


-h, --help
Displays this help.
-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).
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). It is compulsory if a reply from a server, as an HTTP server, is needed. In this case, -w 500 is a good start value.
-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 "". 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.
-n, --name <name>
Send previously saved packet named <name>. Other options overrides saved packet parameters.


Destination address. Optional for saved packet.
Destination port. Optional for saved packet.
Data to send. Optional for saved packet.


The following command line will send a TCP packet, with a mixed-ascii as payload, to, port 22. The command will wait 500 ms for a reply.

    $ packetsender -taw 500 22 "Hello\nWorld"
Similar to last command, but the TCP packet will be sent to port 21. An anonymous authentication will be used.

    $ packetsender -taw 500 21 "USER anonymous\r\nPASS\r\n"
The command below uses SSL and will ignore SSL errors. The command will wait 500 ms for a reply.

    $ packetsender -saw 500 443 "GET / HTTP/1.0\r\n\r\n"
Other good example how to access a homepage:

    $ packetsender -w 500 -a 80 "GET / HTTP/1.1\r\nHost:\r\n\r\n"
Packet Sender command line also can bind to custom ports to force IPv4/6 modes or multiple NIC, as shown below:

    $ packetsender -taw 3000 fe80::c07b:d517:e339:5a08 5005 "Hello\r"
    $ packetsender -taw 3000 5005 "Hello\r"
    $ packetsender -B -taw 3000 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"


tcpdump(8), wireshark(1),


Packet Sender was written by Dan Nagle <> and is available at

This manual page was written by Joao Eriberto Mota Filho <> for the Debian project (but may be used by others).

02 Aug 2020 packetsender-7.0.5