Troubleshooting IPsec VPN connectivity issues can be a complex task and often requires VPN logs to be analysed.  This article uses an example to describe the process of establishing an IPsec VPN tunnel and messages displayed in the syslog.   This will help you in troubleshooting any issues.

Click here for the application note or go to the URL:

https://faq.draytek.com.au/2019/08/28/how-to-analyse-vpn-ipsec-logs/