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Environment/Versions The environment is where traffic is being sent and received on the same physical port. Answer 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 1.1.1.2/30 to 1.1.1.5/30 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 1.1.1.1, it will ARP the destination 1.1.1.5. 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.