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NOTE: No matter on Main mode or Aggressive mode, once the client PC is behind a NAT
device, we have to select FQDN as ID Type and the NAT device must support VPN
passthrough, otherwise the VPN tunnel can’t be established.
Step 4:
Under IKE Proposal 1, we select 1 in this example. Enter Pre-shared Key and SA Lifetime you
want, DPD is disabled.
Step 5:
Click on IPsec on the left menu, then IPsec Proposal. Select Security Protocol, ESP
Authentication and ESP Encryption you want to enable on VPN tunnel. Here we
use ESP, MD5 and 3DES for example.
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