ZyXEL Communications VPN Series Handbook page 204

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Go to VPN > Site-to-site > IKE Policies, click Add to create a new IKE Policy Name.
Then, select Encryption, Hash, Pre-shared Key and D-H Group to match your
ZyWALL/USG's VPN Gateway > Phase 1 Settings. Set Lifetime to 24 hours and click
OK then click Save to exit the IKE Policies page.
VPN > Site-to-site > IKE Policies
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