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Spirent KB Article
Doc ID: FAQ18371
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Spirent TestCenter: How to ARP stream blocks whose endpoints are on the same subnet?
Endpoints on the same subnet does not need to go through a gateway to send traffic to each other thus ARP should go directly to the destination instead of the gateway.
Disable the "Use Gateway as ARP / ND Target" which can be found in Settings under the ARP/ND tab.
Product : Spirent TestCenter,PGA