ZyXEL Communications VPN Series Handbook page 222

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In the SonicWALL VPN > Settings > VPN Policies > Proposals > IKE (Phase 1)
Proposal and set Exchange, DH Group, Encryption and Authentication to match
your ZyWALL/USG's VPN Gateway > Show Advanced Settings > Phase 1 Settings.
Go to IKE (Phase 2) Proposal and set the Protocol, Encryption and Authentication
to match your ZyWALL/USG's VPN Connection > Show Advanced Settings > Phase
2 Settings.
VPN > Settings > VPN Policies > Proposals
Select Enable VPN and click Refresh Active.
VPN > Settings > VPN Global Settings
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