<div dir="ltr">Tested-by: Andrew Bailey <<a href="mailto:abailey@iol.unh.edu">abailey@iol.unh.edu</a>> Reviewed-by: Andrew Bailey <<a href="mailto:abailey@iol.unh.edu">abailey@iol.unh.edu</a>></div> <div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Mar 10, 2026 at 1:13 PM Patrick Robb <<a href="mailto:probb@iol.unh.edu">probb@iol.unh.edu</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Add a filter to the Scapy traffic generator sniffer which forces the sniffer to ignore outbound traffic, preventing double counting of packets. Without this change sniffing will double count packets when DTS is being run with a single link topology, because the Scapy packet transmission and Scapy sniffing is happening on the same port. The correct behavior is to only count inbound traffic which is being returned to the traffic generator by the DTS SUT. Fixes: dfb667368077 ("dts: add Scapy asynchronous sniffer") Signed-off-by: Patrick Robb <<a href="mailto:probb@iol.unh.edu" target="_blank">probb@iol.unh.edu</a>> --- dts/framework/testbed_model/traffic_generator/scapy.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/dts/framework/testbed_model/traffic_generator/scapy.py b/dts/framework/testbed_model/traffic_generator/scapy.py index 9e15a31c00..c6e9006205 100644 --- a/dts/framework/testbed_model/traffic_generator/scapy.py +++ b/dts/framework/testbed_model/traffic_generator/scapy.py @@ -203,7 +203,7 @@ def _sniff(self, recv_port: Port) -> None: ready_prompt = "Ready." self.send_command( "sniff(" - f'iface="{recv_port.logical_name}", quiet=True, store=False, ' + f'iface="{recv_port.logical_name}", filter="inbound", quiet=True, store=False, ' "prn=lambda p: bytes_base64(p.build()).decode(), " f'started_callback=lambda: print("{ready_prompt}")' ")", -- 2.49.0 </blockquote></div>