L2TP Client: Routerboard

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From AAISP Support Site

RouterBoard

Connecting to L2TP with a RouterBoard was pretty seamless - put in the L2TP server IP, username and password and it just connects. Have to mess about with IP / Route and NAT / masquerading a bit to get devices behind the RouterBoard online but that all depends on whether you have an additional IP block and what you want to do with it anyway.