ZyXEL Communications ZyWALL USG 200 Series User Manual page 214

Chapter 8 L2TP VPN Example
15 Configure the following in the Filter Properties window's Protocol tab. Set the
protocol type to UDP from port 1701. Select To any port. Click Apply, OK, and
then Close.
Figure 209 Filter Properties: Protocol
16 Select ZyWALL WAN_IP and click Next.
Figure 210 IP Security Policy Properties: IP Filter List
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ZyWALL USG 100/200 Series User's Guide