A VPN (Virtual Private Network) increases a private network’s functionality, security, and management. It allows the users to establish a secured network connection while using a public network.
The Cisco Get VPN and DMVPN are two of the commonly used VPNs in the networking world.
Key Takeaways
- Cisco GET VPN is a group encryption technology that secures communication within a VPN group.
- DMVPN (Dynamic Multipoint VPN) enables the creation of a scalable, dynamic network of VPN connections.
- GET VPN provides efficient encryption, while DMVPN offers flexibility and automatic tunnel establishment.
Cisco Get VPN vs DMVPN
GET VPN provides secure, private communication between sites over the public Internet using a common encryption methodology. DMVPN is a hardware-based VPN solution that enables direct, secure communication between sites over the public Internet, using dynamic routing to create a mesh network.
Cisco GET VPN (Group Encrypted Transport) is a group of features mandatory to secure IP multicast or unicast traffic.
The GET VPN protects any traffic over a private WAN flowing through a Cisco IOS device.
GET VPN combines the Group Domain of Interpretation (GDOI) keying protocol with IP security (IPsec) encryption to provide users with an effective way to protect IP multicast or unicast communication.
While DMVPN helps transfer data from one network to another without verifying the traffic. It helps in transferring the data in the presence of a secured network.
It is unique because it is integrated with unique software that constructs IP security and GRE VPNs without challenging them. One of its unique features is that it provides dynamically addressed spokes.
Comparison Table
| Parameters of Comparison | Cisco Get VPN | DMPVN |
|---|---|---|
| Scalability | It is more scalable as compared to DMVPN. | It is less scalable than the former. |
| Essential Protocols | Group Domain Of Interpretation (GDOI), Electronic Stability Program (ESP) | Next Hop Resolution Protocol (NHRP) |
| Tunnel Requirement | No tunnel requirement is needed. | A tunnel requirement is needed. |
| Model | It secures an existing VPN. | It creates a VPN and then secures the VPN. |
| Multicast Performance | Since it does not have any multicast replication issues, the multicast performance is better. | The multicast performance is not as good as Cisco GET VPN. |
What is Cisco GET VPN?
Cisco Group Encrypted VPN encrypts all Wide Area Network traffic and provides data security and authentication of transport.
This helps in meeting the security compliance and internal regulations of the network.
GET VPN allows the router to encrypt IP multicast and unicast traffic without tunnelling them. This helps eliminate the requirement to configure tunnels while securing any traffic.
By removing the need for tunnels, GET VPN scales higher at the time of maintaining network intelligence features. This is important for good voice and video quality.
In addition to IP and MPLS, GET-based networks can be employed in a variety of WAN scenarios.
MPLS VPNs that employ this encryption technology are extremely scalable, controllable, and cost-effective, as well as meeting government-mandated encryption standards.
Now, while using a VPN, one needs to keep in mind a few prerequisites for the VPN to function efficiently. The same goes for Cisco GET VPN. Some of the important ones are mentioned below.
The user must be using a version of Cisco IOS XE Release 2.3 or later. One should have ample knowledge about IP security and Internet Exchange (IKE).
The user should know about the multicast and unicast routing configuration on a Cisco IOS XE global router.
What is DMVPaN?
Dynamic Multipoint VPN is a routing mechanism that allows us to build a VPN network without the need for numerous sites. It ends the trouble of configuring all the devices statically.
It is a “hub and spoke” network, which means the spokes can interoperate without needing to go through the hub.
The main component of a DMVPN is NHRP. The DMVPN creates dynamic NBMA addresses with spoke. It also creates spoke-to-spoke tunnels.
There are two dimensions in multipoint GRE tunnels: Single Tunnel Interface, where the hub configuration is small, and Multicast Interface, where the hub configuration is large. Second, the Dynamic Tunnel destination, where the NBMA IP address is mapped onto the VPN IP address.
There are two main designs of a DMVPN network: “Spoke and Hub” and “Spoke to Spoke”.
In the Spoke and Hub network, the traffic is transferred through a hub, and the number of tunnels should be the same as in the Spoke.
The Spoke-to-Spoke network has dynamic tunnels, and the traffic is controlled too.
The few advantages of using a DMVPN are that a large amount of capital is not required to install it, and the expenses of operations are reduced.
Moreover, it increases business flexibility as the companies can easily complete their targets and recover their loss, if any, within no time.
In this way, the entire business flexibility of a company enhances rapidly. Also, a company’s connectivity at the branch-to-branch level increases considerably as they corroborate a strong connection with each other.
Main Differences Between Cisco GET VPN and DMVPN
- Cisco GET VPN provides fully meshed topologies, while DMVPN provides ‘hub and spoke’ and a combination of partially and fully meshed topologies.
- In Cisco GET VPN, public internet support is not needed because of IP preservation, while public internet support is needed in DMVPN.
- The encryption in Cisco GET VPN is group protected, while DMVPN is a peer-to-peer encryption network.
- Cisco GET VPN is recommended over private networks, while DMVPN is recommended over public networks.
- With MPLS VPN, Cisco GET VPN employs unique policies or multiple overlays, whereas DMVPN employs multiple overlays or a single overlay.
- https://books.google.com/books?hl=en&lr=lang_en&id=zMSZVzmxM5wC&oi=fnd&pg=PT33&dq=cisco+getvpn+and+dmvpn&ots=aKkl1w1yHC&sig=8MGzTWNkzrfCEbrNJUpxlLE5MAM
- https://books.google.com/books?hl=en&lr=lang_en&id=v_p2agdkt-0C&oi=fnd&pg=PT47&dq=cisco+getvpn+and+dmvpn&ots=wALAL19SmS&sig=dcv9A7Hj5Dsk2gchk7eFodqEXuM
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