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What is FlexVPN? What are the Benefits of FlexVPN?

VPN technology is becoming more and more popular every day.

Businesses are using VPNs to connect remote offices, and people are using VPNs to protect online privacy.

In this blog post, we will explain what FlexVPN is and how it differs from DMVPN.

What is FlexVPN?

FlexVPN is a type of virtual private network (VPN) solution that allows for simplified configuration and deployment. It utilizes IKEv2 as the key exchange protocol and combines aspects of multiple VPN configurations, such as traditional site-to-site, remote access, and DMVPN protocols.

The result is a flexible and scalable VPN solution that can be easily adapted to fit various network needs. It can also support a variety of encryption methods, including AES and 3DES.

What is IKEv2?

IKEv2, also known as Internet Key Exchange version 2, is a security protocol designed for remotely connecting devices over a public network. It offers high speed and reliability, making it particularly suitable for mobile devices that may frequently switch networks. IKEv2 also offers strong encryption to protect any exchanged data and supports advanced features such as VPN server failover and split tunneling.

What are the Benefits of FlexVPN?

The FlexVPN solution offers a variety of benefits to businesses and organizations. One major advantage is its flexibility, as it allows for a combination of remote access and site-to-site connectivity using a variety of protocols. This also streamlines management and installation as it uses a feature called "smart features."

It also offers enhanced security through the use of encryption and authentication protocols, ensuring that sensitive data remains protected. Additionally, it allows for easy scalability to accommodate growing business needs.

You can find more detailed information on FlexVPN and other networking solutions in our course here.


When it comes to VPN technology, there are a variety of options available. Two of the more commonly used types are FlexVPN and DMVPN. FlexVPN is Cisco's unified VPN solution that can support a variety of protocols and uses the Internet Key Exchange version 2 for key management.

On the other hand, DMVPN (Dynamic Multipoint Virtual Private Network) is a solution that allows for the dynamic creation and deletion of tunnels as well as support for multiple spoke devices. Both options offer advantages based on specific needs and requirements.

Here Are a Few Fundamental Differences Between the Two Solutions:

  • IPSec: One key difference between FlexVPN and default Dynamic Multipoint VPN (DMVPN) is the protocol used for negotiating IPsec Security Associations (SAs). While DMVPN defaults to using Internet Key Exchange version 1 (IKEv1), FlexVPN utilizes IKEv2. This offers several benefits, including support for EAP authentication methods and improved efficiency in rekeying and integrating with third-party devices.
  • GRE: While DMVPN primarily uses static multipoint GRE interfaces, FlexVPN utilizes both static and dynamic point-to-point interfaces. This allows for greater flexibility and the ability to adapt to changing network environments.
  • NHRP: In FlexVPN, NHRP (Next Hop Resolution Protocol) serves as the primary means of communication between spokes. Unlike traditional hub-and-spoke VPNs, spokes in a FlexVPN do not register with the hub. Instead, they utilize NHRP to communicate directly with each other and establish VPN tunnels. This simplifies configuration and increases network efficiency by reducing reliance on a central hub.
  • Routing: Both solutions utilize dynamic routing protocols, but FlexVPN takes this one step further by also including the option to use IPsec to introduce routing information. This added feature allows for even greater flexibility and opportunities for customization in network setup.

Final Words

FlexVPN is a relatively new and more advanced network solution that can provide your business with added security, performance, and flexibility.

While there are many VPN solutions around, it offers several advantages that make it worth considering for your organization.

We highly recommend that you take the time to explore all this technology offers and see if it might be a good fit for your needs.

Created by
Stanley Avery

I am a certified network engineer with over 10 years of experience in the field. I have a deep understanding of networking and IT security, and I am always looking for new challenges.

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