Overlay Tunnels - Generic Routing Encapsulation (GRE) Tunnels

3 important questions on Overlay Tunnels - Generic Routing Encapsulation (GRE) Tunnels

Which IP versions are supported by GRE?

GRE supports both IPv4 and IPv6 as both overlay and underlay network.

A problem with Overlay Networks can be Recursive Routing. What is the Recursive Routing problem in Overlay Networks?

Recursive Routing happens when the tunnel is formed and one router, through the tunnel, learns new routes to the other router which are more specific and go outside of the tunnel.
The first router then tries to send traffic which should traverse the tunnel over the underlay network.

What is the main concept of how GRE Tunnels are set up?

- It uses Key Servers and has a Primary Key Server
- Group Members register at the Key Servers
- Primary Key Server is responsible for Rekeying responsibilities

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