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
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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
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