A VPN (Virtual Private Network) increases the functionality, security, and management of a private network. 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.
Cisco Get VPN vs DMVPN
The main difference between Cisco Get VPN and DMVPN is that the Cisco Get VPN is a VPN technology without a tunnel, that is, it provides end-to-end encryption of the data for any network traffic across a fully meshed topology. The DMVPN provides a fully meshed topology by forming an IPsec tunnel over any addressed spokes.
Cisco GET VPN (Group Encrypted Transport) is a group of features mandatory to secure IP multicast or unicast traffic. Any traffic over a private WAN flowing through a Cisco IOS device is protected by the GET VPN. 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 in transferring data from one network to another without the trouble of 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 provides dynamically addressed spokes.
Comparison Table Between Cisco Get VPN and DMPVN
|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 tunneling them. This helps in eliminating the requirement to configure tunnels while securing any kind of 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 is 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 configuration of multicast and unicast routing on a Cisco IOS XE global router.
What is DMVPN?
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 with one another without the need of going 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, namely “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 the Spoke. In the Spoke-to-Spoke network, there are 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, the connectivity of a company 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 generally 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.
Thus, Cisco GET VPN and DMVPN are two of the most frequently used VPNs in the networking world. They provide flexibility and are scalable. Cisco GET VPN is preferred over public networks whereas DMVPN is preferred over private networks.
But both of them are considered useful in protecting traffic and help in maintaining the security of a network. Both of them are useful as they provide secure encryption, disguise the whereabouts of any user and give access to regional location (changes the location of a user to some other place).