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Trex VM/Scapy server

• Install VM using this manual
• Configure VM:
  • Open VM Settings -> Network -> Advanced -> Port forwarding
  • Add VM port forwarding for ports: 4501(async), 4507(scapy-server)
• Update trex:
  • Start VM and connect via ssh: ssh -p 3022 [email protected] (password: trex)
  • Update TRex to the latest release

    cd /opt/trex/
    wget --no-cache http://trex-tgn.cisco.com/trex/release/latest
    tar -xzvf latest

• Run TRex server: (cd /opt/trex/v2.* ; sudo ./t-rex-64 -i )

Scapy server

Since version v2.14 trex-core runs scapy_server automatically on the same host, but on port 4507.

Trex Stateless GUI

Download latest release from https://github.com/kisel/trex-stateless-gui/releases

You can use Mac/Windows installer (dmg/exe files)

Packet editor

You can find embedded packet editor in a build/edit stream dialogs

Appending new layer

You can select available(suggested) layers, or type any layer you want to produce a malformed structure. Click on a append field and start typing - autocompletion will show all available variants without restrictions.

Moving and deleting layers

Packet editor is flexible and uses Scapy to build packets. It allows to create malformed packets, and shows a warning(red label on a layer name). You can move and remove any layer(except Ether) by the right-click on the layer title

Menu and Toolbar

You can use menu, hotkeys and the toolbar to use the following features:

• create a new packet
• create a new packet from the template
• undo & redo
• import a first packet of the PCAP file
• Export packet to PCAP file or save current packet model to a JSON file

Menu is not available in the embeded mode

Payload generator

Payload generator can append Random or template bytes to any layer You have following options:

Use template-code and specify the target size of a payload of a whole packet you want. Template code is a hex string. Example: "DE AD BE EF F0 0D" (6 bytes will be repeated to fill the target size. all whitespaces are ignored).

You can upload a binary file as a payload

Use "random ascii/bytes" option to generate random payloads of printable characters or any bytes.

Binary viewer

At any time you can see the binary representation of a network packet you've created. Click on a field to highlight corresponding packet bytes in a binary viewer

Field engine

List of supported instructions

• STLVmFlowVar
• STLVmWrFlowVar
• STLVmWrMaskFlowVar
• STLVmFixIpv4
• STLVmTrimPktSize
• STLVmTupleGen
• STLVmFlowVarRepetableRandom
• STLVmFixChecksumHw

Smart autocomplete for instruction parameters. Flow variable names:

Fields' offset names:

Handle protocol duplication. Packet structure widget and offset autocompleter knows when packet contains duplicate protocols and suggest protocol indexes also.

Create predefined instructions template with initial parameter values:

Interactive help for instructions:

Import parameters from simple configuration mode:

It is easy to export parameters from simple configuration mode to Advanced(Packet Editor + Field Engine).