Techniques are described for an enhanced two-way active measurement protocol (TWAMP) to measure network performance of links and/or network paths in a fully converged Software Defined Wide Area Network (SD-WAN), using a single TWAMP instance. In one example, a first network device executing a TWAMP session-sender may send a test packet embedded with one or more metrics to the TWAMP session-reflector executed by another network device, which reflects the test packet embedded with one or more metrics back to the TWAMP session-sender. The TWAMP session-sender may further reflect a test packet embedded with one or more additional metrics back to a TWAMP session-reflector to enable the network devices to independently perform network performance calculations using the metrics embedded within the test packets exchanged in a single TWAMP instance.