In this article we will configure an IPsec tunnel mode site-to-site VPN between a Vyatta VC5 and a Cisco router.
I've decided to put the commands used to configure the two routers in a table, to have them side-by-side.
Figure1 and Figure2 show the network diagrams for this lab:
Figure1: Basic Network Diagram
Figure2: Detailed Network Diagram of the Test Lab