E-Lins H820QO Series User Manual page 46

 Enable: enable IPSEC feature
 Exchange mode: IKEv1-Main, IKEv1-Aggressive, and IKEv2-Main mode are
supported.
 Operation Level: for IPSec backup. One instance is Main then another instance is
Backup. If Main instance is down switch to backup instance.
 Authentication method: PSK Client, PSK Server, RSA X.509 Client and RSA X.509
Server. Client is the device which starts the IPSEC connection.
 Remote VPN endpoint: domain name or IP address of the remote endpoint. It can be
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