TMS zl Management and Configuration Guide ST.1.1.100226

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Virtual Private Networks
Configure an L2TP over IPsec VPN
Figure 7-152 shows an L2TP over IPsec VPN in which the remote clients are
on the subnets 172.22.3.0/24 and 10.78.15.0/24. For this VPN, a default route
through 192.168.115.1 would work. However, to better illustrate the necessary
routes, the figure shows two specific routes: one to each remote subnet. For
both routes, the gateway is 192.168.115.1. Whether a default route or specific
routes are used for this example, the IKE policy for this VPN must specify
192.168.115.71 as the local gateway. Similarly, L2TP clients contact the TMS
zl Module at 172.168.115.71.
See Chapter 9: “Routing” for instructions on setting up routes.
Figure 7-152. Routes for an L2TP over IPsec Client-to-Site VPN