How To Configure Site-To-Site Ipsec Vpn With Cisco; Set Up The Ipsec Vpn Tunnel On The Zywall/Usg - ZyXEL Communications ZyWALL 110 Handbook

Default NAT traversal is enable on ZyWALL/USG, please make sure the remote IPSec device must
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also have NAT traversal enabled.

4.4 How to Configure Site-to-site IPSec VPN with Cisco

This example shows how to use the VPN Setup Wizard to create a site-to-site VPN between a
ZYWALL/USG and a Cisco router. The example instructs how to configure the VPN tunnel between
each site. When the VPN tunnel is configured, each site can be accessed securely.
Figure 280 ZyWALL Site-to-site IPSec VPN with Cisco Connected
Note: All network IP addresses and subnet masks are used as examples in this article.
Please replace them with your actual network IP addresses and subnet masks. This
example was tested using USG310 (Firmware Version: ZLD 4.13) and ISA500
(Firmware Version: 1.0.3).

4.4.1 Set Up the IPSec VPN Tunnel on the ZyWALL/USG

In the ZyWALL/USG, go to CONFIGURATION > Quick Setup > VPN Setup Wizard, use the VPN
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Settings wizard to create a VPN rule that can be used with the Cisco. Click Next.
Figure 281 Quick Setup > VPN Setup Wizard > Welcome
Choose Advanced to create a VPN rule with the customize phase 1, phase 2 settings and
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authentication method. Click Next.
Chapter 4 Create Site-to-Site VPN Tunnels
ZyWALL/USG Series User's Guide
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