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I first discovered GRE with IPSec about 4 years ago when a customer needed [nizoral] to transmit IPX and multicast nizoral traffic over his VPN. Since then, I have primarly used GRE/IPSEC tunnels for transmitting internal routing protocols over the internet. RIP, EIGRP or OSPF can be used over a GRE tunnel just as though it were a point to point circuit. It is also very useful for multicast music on hold.
This tutorial is part one of a two part series. Nizoral if you have not already been through the internat lab series nizoral, i recommend watching them before starting the gre/ipsec tutorials - and .