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Spirent KB Article
Doc ID: FAQ19519
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Spirent TestCenter: Why Raw Stream not able to send back to itself?
The environment is where traffic is being sent and received on the same physical port.
This issue is seen only when the Source and Destination is on the same class C network.
Raw Stream doesn't know about subnet mask, so if the first 3 octets are the same, it is considered to be in the same subnet and when ARPing, it will ARP the destination and not the gateway.
Such as 220.127.116.11/30 to 18.104.22.168/30 are both in different subnets but the Raw Stream doesn't have the concept of the /30 subnet and so instead of ARPing the gateway of 22.214.171.124, it will ARP the destination 126.96.36.199. The ARP will fail.
To work around this issue, need to use Bound Streams.
Create Device Blocks with the /30 subnets and create the Bound Streams from those devices.
Product : Spirent TestCenter,PGA