diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index 8f7145c413b99f3a80b049a7c207ef0b6b15a3b3..c0589e071f20ad5bc012310f36afe2f22090a55a 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -395,10 +395,14 @@ do_transfer()
 			capuser="-Z $SUDO_USER"
 		fi
 
-		local capfile="${listener_ns}-${connector_ns}-${cl_proto}-${srv_proto}-${connect_addr}.pcap"
+		local capfile="${rndh}-${connector_ns:0:3}-${listener_ns:0:3}-${cl_proto}-${srv_proto}-${connect_addr}-${port}"
+		local capopt="-i any -s 65535 -B 32768 ${capuser}"
 
-		ip netns exec ${listener_ns} tcpdump -i any -s 65535 -B 32768 $capuser -w $capfile > "$capout" 2>&1 &
-		local cappid=$!
+		ip netns exec ${listener_ns}  tcpdump ${capopt} -w "${capfile}-listener.pcap"  >> "${capout}" 2>&1 &
+		local cappid_listener=$!
+
+		ip netns exec ${connector_ns} tcpdump ${capopt} -w "${capfile}-connector.pcap" >> "${capout}" 2>&1 &
+		local cappid_connector=$!
 
 		sleep 1
 	fi
@@ -423,7 +427,8 @@ do_transfer()
 
 	if $capture; then
 		sleep 1
-		kill $cappid
+		kill ${cappid_listener}
+		kill ${cappid_connector}
 	fi
 
 	local duration