Juniper Networks, Inc.

Senthil Kumar Duraiswamy

Manoj Apte

Saravanan Deenadayalan

Fritz Budiyanto

Sandeep Jain

Yulianto Ko

A network device may limit the rate at which control messages are forwarded to a destination device when forwarding traffic pursuant to dynamic flow capture (DFC). In one implementation, a system may receive filtering criteria associated with DFC of network traffic and passively filter incoming traffic based on the filtering criteria to obtain traffic that matches the filtering criteria. The system may transmit a rate limited version of control messages associated with the filtered traffic to a control device.

Rate limiting for DTCP message transport

A network device comprises a service card (e.g., a dynamic flow capture (DFC) service card) executing a communication protocol to receive, from one or more control sources, flow capture information specifying at least one destination and criteria for matching one or more packet flows. The network device includes a network interface card to receive a packet from a network, a packet replication module to replicate the packet, and a control unit to provide the replicated packet from the interface card to the DFC service card. The network device includes a filter cache that caches flow capture information recently received from the CSs. The network device may provide real-time intercept and relaying of specified network-based communications. Moreover, the techniques described herein allow CSs to tap packet flows with little delay after specifying flow capture information, e.g., within 50 milliseconds, even under high-volume networks.

Network device having service card for intercept and monitoring of packet flows

A network device comprises a service card (e.g., a lawful intercept (LI) service card) executing a communication protocol to receive, from one or more sources (e.g., law enforcement agents), intercept information specifying at least one destination and criteria for matching one or more packet flows. The network device further includes a network interface card to receive a packet from a network, and a control unit to provide the packet from the interface card to the LI service card. The LI service card executes a flow match detection module that, when the packet matches the criteria of the intercept information, forwards the packet to the destination specified by the intercept information. The network device may provide real-time intercept and relaying of specified network-based communications. Moreover, the techniques described herein allow LEAs to tap packet flows with little delay after specifying intercept information, e.g., within 50 milliseconds, even under high-volume networks.

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Coimbatore, India

Senthil Kumar Duraiswamy