In me FortiSIEM CLI.

 Syslog Reception Verification: To verify whether syslog messages are being received from a network device, a network packet capture tool can be used.

 tcpdump Command:tcpdumpis a powerful command-line packet analyzer tool available in Unix-like operating systems. It allows administrators to capture and analyze network traffic.

Usage: By usingtcpdumpwith the appropriate filters (e.g., port 514 for syslog), administrators can monitor the incoming syslog messages in real-time to verify if they are being received.

Example Command:tcpdump -i port 514captures the syslog messages on the specified network interface.

 References: FortiSIEM 6.3 User Guide, CLI Commands section, which details the usage oftcpdumpfor network traffic analysis and verification of syslog reception.