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Spirent KB Article
Doc ID: FAQ16766
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Spirent TestCenter:How to add modifier under GRE header sequence number?
Set the Sequence Number presence bit to 1 and then add the modifier on the sequence number field.
Attached is the Sample configuration which have the modifier on Sequence number field.
The GRE header will need to have IP (or any other upper layer protocol),if it is not required we have to set the protocol field to 0000.
Product : Spirent TestCenter,Spirent TestCenter,PGA