ZyXEL Communications 2WG - Manual (Page 119)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
119
1) Ping the local gateway.
2) Ping the IPSec Remote Gateway
3) Ping the remote host with virtual IP address that’s located on the remote network.
Never lost your VPN connection (IPSec High Availability)
1. Setup ZyWALL VPN with high availability