D-Link DSR-250N - Extended Authentication (XAUTH); Figure 80: Ipsec Policy Configuration Continued (Auto; Manual Phase 2)

Unified Services Router User Manual
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Figure 80: IPsec policy configuration continued (Auto / Manual Phase 2)
6.2.1 Extended Authentication (XAUTH)
You can also configure extended authentication (XAUTH). Rather than configure a
unique VPN policy for each user, you can configure the VPN gateway router to
authenticate users from a stored list of user accounts or with an external
authentication server such as a RADIUS server. With a user database, user accounts
created in the router are used to authenticate users.