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 interfaceinterface tunnel tunnel-number
- Identify local source of tunneltunnel source ip address | interface ID
- Identify tunnel destinationtunnel destination ip address
- Set ip address on Tunnel interfaceip address ip-address subnet-mask
- Optionally, define the tunnel bandwidtbandwidth 1-10000000
- Optionally, specify GRE tunnel keepalivekeepalive seconds retries
- Optionally, define MTUip mtu mtu
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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:
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