DMVPN Tunnels - Generic Routing Encapsulation (GRE) Tunnels
4 important questions on DMVPN Tunnels - Generic Routing Encapsulation (GRE) Tunnels
What is Generic Routing Encapsulation (GRE)?
What is important to note about GRE and mGRE tunnels and security?
What are the steps to configure a GRE tunnel?
- Create tunnel interface
interface tunnel source tunnel-number - Identify local source of tunnel
tunnel source ip address | interface ID - Identify tunnel destination
tunnel destination ip address - Set ip address on Tunnel interface
ip address ip-address subnet-mask - Optionally, define the tunnel bandwidt
bandwidth 1-10000000 - Optionally, specify GRE tunnel keepalive
keepalive seconds retries - Optionally, define MTU
ip mtu mtu
- Higher grades + faster learning
- Never study anything twice
- 100% sure, 100% understanding
How much encapsulation overhead is added to the packet size with GRE?
- A minimum of 24 bytes for GRE without IPsec
- A maximum of 77 bytes for GRE with AES and SHA-1
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
![Trustpilot Logo](/images/design_2020/lp/clp-trustpilot-en.png)