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Spirent KB Article
Doc ID: FAQ14479
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Spirent TestCenter: How to create custom payload traffic?
There is a new feature in v4.36 called "Custom Header Hex editor"
Prior to v4.36 the custom payload can still be created but only on a single line input window.
Edit custom header byte pattern in PDU editor
The custom header will have an ellipses button to select to open the hex editor.
You can edit, copy, paste in this editor.
Limit is 1500 bytes.
Product : Spirent TestCenter,PGA