2.2.6.10.6 com.microsoft.wm.srvppair

The com.microsoft.wm.srvppair token specifies support for Packet-Pair. This is a technique in which the server sends two or three packets with random data to the client over UDP or TCP. The client measures the time it takes for the second packet to arrive and can use this information to estimate the bottleneck bandwidth on the network path between the server and the client.

If a server never sends the Supported header, or if a server does not specify the com.microsoft.wm.srvppair token on the Supported header, clients MUST NOT send a TcpPacketPair (section 2.2.7.12) request or a UdpPacketPair (section 2.2.7.14) request to the server.<14>

If a client never sends the Supported header, or if a client does not specify the com.microsoft.wm.srvppair token on the Supported header, servers SHOULD assume that the client does not intend to send a TcpPacketPair request or a UdpPacketPair request.