TP-Link TD-W9970 User Manual page 50

Authentication Method:

Pre-Shared Key:

peers use the same key. The key should consist of visible characters without blank space.
Perfect Forward Secrecy:

We recommend you leave the Advanced Settings as default value.
 After complete the basic settings and click
LAN1 could communicate with PCs in remote LAN2. (For example: You can ping the IP
address of PC2 which is 192.168.2.100 in PC1)

Note:
The VPN Servers Endpoint from both ends must use the same pre-shared keys and Perfect Forward
Secrecy settings.
Select Pre-Shared Key (recommended).
Enter the Pre-shared Key for IKE authentication, and ensure both the two
PFS is an additional security protocol.
Save/Apply in both Device1
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TD-W9970 User Guide
and Device2, PCs in