I first discovered GRE with IPSec about 4 years ago when a customer needed to transmit IPX and multicast 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.

 

 

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This tutorial is part one of a two part series. If you have not already been through the internat lab series, I recommend watching them before starting the GRE/IPSec tutorials - Internet Lab Part 1 and Internet Lab Part 2.

 

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