How is GRE used by the PPP protocol?
What will be an ideal response?
After PPTP establishes the VPN tunnel, GRE (Generic Routing Encapsulation), developed by Cisco, is used to transmit PPP data frames through the tunnel. GRE encapsulates PPP frames to make them take on the temporary identity of IP packets at Layer 3. To the WAN, messages look like inconsequential IP traffic-the private information is masked inside a new layer of IP headers. But the points at each end of the tunnel only see the original protocols that were safely wrapped inside the GRE frame. Encapsulating alone does not provide security, though, so GRE is used in conjunction with IPsec, an encryption protocol, to increase the security of the transmissions.?
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