Round-trip time measurement in a packet-switched communication network

A node for a packet-switched communication network, said node being configured to exchange a bidirectional packet flow with another node of said packet-switched communication network, said node being configured to apply a respective marking value to packets of said bidirectional packet flow to be transmitted to said other node said node being configured to:

• a) switch said respective marking value applicable to packets of said bidirectional packet flow to be transmitted to said other node upon detection of a switching of the marking value applied to packets of said bidirectional packet flow which are being received from said other node,
• wherein said node is further configured to, upon said detection of said switching of the marking value applied to packets of said bidirectional packet flow which are being received from said other node, wait a wait time TW before switching said respective marking value applicable to packets of said bidirectional packet flow to be transmitted to said other node,
• wherein the value of said wait time TW is selected by said node, the value of said wait time TW being unknown to parties non authorized by an entity managing said node.

A packet-switched communication network comprising two nodes exchanging a bidirectional packet flow, each one of said two nodes applying a respective marking value to packets of said bidirectional packet flow to be transmitted to the other one of said two nodes, wherein:

• a) each one of said two nodes is configured to switch said respective marking value applicable to packets of said bidirectional packet flow to be transmitted to the other one of said two nodes upon detection of a switching of the marking value applied to packets of said bidirectional packet flow which are being received from the other one of said two nodes,
• wherein at least one of said two nodes is further configured to, upon said detection of said switching of the marking value applied to packets of said bidirectional packet flow which are being received from the other one of said two nodes, wait a wait time TW before switching said respective marking value applicable to packets of said bidirectional packet flow to be transmitted to the other one of said two nodes,
• wherein the value of said wait time TW is selected by said at least one node, said value of said wait time TW being unknown to parties non authorized by an entity managing said at least one node.