The diagram below shows the encapsulation procedure of a simple - unprotected GRE packet as it traversers the router and enters the tunnel interface: If data protection is required, IPSec must be configured to provide data confidentiality – this is when a GRE tunnel is transformed into a secure VPN GRE tunnel. It is important to note that packets travelling inside a GRE tunnel are not encrypted as GRE does not encrypt the tunnel but encapsulates it with a GRE header. With GRE, a virtual tunnel is created between the two endpoints (Cisco routers) and packets are sent through the GRE tunnel.
Generic Routing Encapsulation ( GRE) is a tunneling protocol developed by Cisco that allows the encapsulation of a wide variety of network layer protocols inside point-to-point links.Ī GRE tunnel is used when packets need to be sent from one network to another over the Internet or an insecure network.
0 kommentar(er)
