net_flow_tcp_end(1)¶

NAME¶

net_flow_tcp_end - Event for monitoring the termination of TCP flows

DESCRIPTION¶

The net_flow_tcp_end event is derived from base network raw events and is designed to monitor the termination of TCP flows. It leverages cgroup skb eBPF programs, focusing specifically on the TCP protocol's termination phase, and is instrumental in analyzing IP and TCP headers data to detect the end of TCP connections.

The event utilizes cgroup skb eBPF programs to intercept and analyze raw network events at the kernel level, with a particular emphasis on the TCP protocol's termination phase. It processes IP and TCP headers to pinpoint the conclusion of TCP communication flows. The event identifies the termination of TCP connections by analyzing the status of TCP flags, primarily focusing on the FIN and RST flags.

EVENT SETS¶

network_events, flows

DATA FIELDS¶

conn_direction (string) : Indicates whether the terminated connection was 'incoming' or 'outgoing'

src (string) : The source IP address, extracted from the IP header, from the side terminating the connection

dst (string) : The destination IP address, obtained from the IP header, of the side receiving the termination

src_port (uint16) : The source port number, derived from the TCP header

dst_port (uint16) : The destination port number, ascertained from the TCP header

src_dns ([]string) : Associated domain names for the source IP, resolved using DNS cache

dst_dns ([]string) : Related domain names for the destination IP, determined through DNS cache

DEPENDENCIES¶

Event Dependencies:

net_packet_flow_base: Base network packet flow event for network packet capture

USE CASES¶

Network Monitoring: Monitor the termination of TCP connections for network security and performance analysis
Security Analysis: Detect unusual traffic patterns, potential security threats, or abrupt end of communication
Connection Tracking: Track the lifecycle of TCP connections from establishment to termination

net_flow_tcp_begin: Event for monitoring the beginning of TCP flows
net_packet_tcp: TCP packet capture events

PERFORMANCE CONSIDERATIONS¶

While designed to minimize system overhead, performance may vary based on the volume of network traffic and the complexity of monitored TCP flows. Efficient data management and analysis are key to leveraging the full potential of this event without affecting system performance adversely.