ZyXEL Communications ZyWALL 110 Handbook page 205

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Go to VPN > Site-to-site > Transform Sets, click Add to create a new Transform Set
name. Then, select Integrity and Encryption to match your ZyWALL/USG's VPN
Connection > Phase 2 Settings. Click OK and click Save to exit the Transform Sets
page.
VPN > Site-to-site > Transform Sets
Go to VPN > Site-to-site > IPsec Policies and click Add. The new IPsec Policies
dialog box appears. Go to Basic Settings, create IPsec policy Description name
and click On the IPsec Policy Enable option.
Select Static IP as the Remote Type. Set Remote Address to be your ZyWALL/USG's
WAN IP Address (in the example, 172.101.30.73). Enter the same Pre-Shared Key as
you created in ZyWALL/USG. Then, set WAN Interface to the Internet-facing
interface (found under Status > WAN Interface).
Select Local network to be the IP address range of the network connected to the
Cisco (found under Status > LAN Interface) and Remote network to be the IP
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