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.

View profile

Daniel Lardeux
Daniel Lardeux Senior Network Consultant at Post Telecom

I passed the CCDE Practical exam and Orhan’s CCDE course was very important contributor to my success. I attended the CCDE course of Orhan Ergun in July and it was exactly what I needed, Orhan is taking the pain to break down the different technologies.

Roy Lexmond
Roy Lexmond Senior Network Designer at Routz CCDE #20150017 & CCIE R&S; #26557

After I attended Orhan Ergun’s CCDE course I passed the CCDE practical exam.I really enjoyed the course a lot ...

Nicholas Russo
Nicholas Russo Network Consulting Engineer (CCDE/CCIEx2), Cisc

I signed up for Orhan’s CCDE training. This training is very technically detailed and the use-cases, quizzes, scenarios, and mind maps are all great resources in the overall training program. Orhan teaches his students to think like a network designer ...

Slide Heading
Slide Heading Network Systems Engineer at Conscia A/S CCIE #42544 (SP) & CCDE #20160015

Orhan is forcing you to take off the implementation hat that most of us have been wearing for many years, instead he is providing a new fancy design hat, which makes you see and deal with the issues presented ...

Kim Pedersen
Kim Pedersen CCIE in RS and SP (#29189) CCDE#20170021

I’ve used Orhan’s self-paced CCDE training material. If you are interested in knowing how all the technologies go together in a coherent design i can highly recommend it.I also enjoyed the Quizzes which helped pick out my weak spots in selecting ...

Laurent Metzger
Laurent Metzger 3xCCIE/CCDE Senior Network Architect

Hi Orhan. I passed the CCDE exam on February 22. I read everything that you put on your Self Paced CCDE Training course and it was very helpful in my success. Thank you very much.

Martin J. Duggan
Martin J. Duggan Network Architect at AT&T;, Ciscopress Author CCDE #20160006 & CCIE#7942

I attended Orhan’s April 201610 days CCDE Bootcamp. I am CCDE now !

You can tell Orhan has a great deal of experience, it really comes through when he presents his design case studies and the CCDE Practical scenarios.

Muhammad Abubakar
Muhammad Abubakar Lead Network Architect – CCDE #20160016 2xCCIE #26693 2xJNCIE VCIX

Your excellent CCDE materials and amazing Bootcamp helped me tremendously through my learning journey.Also thank you very much for being available whenever I have a design question or a complex design topics. I can’t compare your design skills ...

Jennifer Pai
Jennifer Pai Network/Security Engineer at KNET Technology

Thanks Orhan very much for this course. It helped strengthen my “Network design mind”.

Ruslan Silyayev
Ruslan Silyayev Solution Architect at R.I.S.K Company

Training by Orhan is not a CCDE preperation training only. It will be useful for engineers which are dealing with design. You want to pass CCDE exam or learn network design, then don’t look at anywhere else!

Sameer Meher
Sameer Meher Solutions Architect at 23 Wards/Japan

Orhan Ergun’s CCDE course was really very good. CCDE Level Intelligence was delivered very well and with very useful case studies and the scenarios, I am thankful to Orhan for all his help!

Ken Young
Ken Young Senior Technical Architect Province of Nova Scotia, 2xCCIE #41597 | CCDE #20170047

If anyone wants to understand network design and architecture, also pass CCDE exam , I recommend you to attend Orhan’s online courses! I am a CCDE now but learning is a journey, we will be together in your other courses too Orhan!

Matt Cross
Matt Cross Technical Architect at Heartland – CCDE #2019::7

Orhan did an excellent job of filling in the gaps of knowledge that I had that took me to the finish line of the practical exam CCDE. The community of people that Orhan facilitates are both engaging and supportive of the journey to CCDE. Orhan ...

Shiling Ding
Shiling Ding Sentinel Technologies – CCDE #2019::12

Just passed the CCDE Practical exam! I attended Orhan Ergun’s CCDE training program , used Orhan’s Instructor Led and Self-Paced CCDE training and Online CCDE Practical Scenarios during my CCDE journey. Orhan’s CCDE In Depth book is an excellent summary ...

Abelardo Basurto
Abelardo Basurto Solutions Architect at Cisco Systems – CCDE 2018::6

Hi everyone, I’ve just passed the CCDE Exam. My Number is CCDE 2018::6 I attended to Online CCDE Bootcamp of Orhan. I want to thank Orhan not only for the great book and bootcamp, but also for his commitment, availability and willingness to assist the ...

Hady Mohamed Abdellah
Hady Mohamed Abdellah Network Architect Hamad International Airport Qatar – CCDE 2018::1

Hi guys, I’m so happy that I passed the exam. I’ve already got my number CCDE 2018::1. Thanks to Orhan for being the best CCDE instructor in the world. I highly recomend Orhan’s CCDE Training and In-Depth-CCDE ...

Bryan Bartik
Bryan Bartik Sr. Systems Engineer at CompuNet – CCDE 20170059

Hi Orhan I passed CCDE Practical exam on November 2017 ! I really enjoyed your materials and quizzes and use cases. They were definitely helpful in my preparation. Thanks a lot !

Giedrius Trapkauskas
Giedrius Trapkauskas Network Solutions Architect at Liberty Global – CCDE 20180004

I attended Orhan’s CCDE Training in Istanbul and it was very helpful in my preparation. I passed the exam recently and I want to say Thank you Orhan! For those who want to pass the CCDE exam, definitely start with ...

Alaa Issa
Alaa Issa Sr.Solutions Architect – CCDE#20180033 3xCCIE ( Collab|DC|Security )#27146

I registered to Orhan’s training in Feb 2017. From that time, I attended Orhan’s training several times. The depth of knowledge which Orhan has is amazing, and how to present such consistent knowledge to the ...

Mazin Ahsan Design Lead Engineer | Solutions Engineer | CCDE License # 20160030 | CCIE Licence # 23892

I passed the CCDE Practical Lab exam on November 17,2016 from supplications of elders and dedication from my Sensei Mr. Orhan Ergun I took different CCDE bootcamps in the past. Orhan has the most depth and expertise ...

Jeff Patterson CCDE# 2018::11

Hi Orhan I wanted to pass along my appreciation for the outstanding training material. I used the online CCDE training provided by Orhan as well as the In-Depth-CCDE book and passed the exam in February 2018. Thank you Orhan!

Mehdi Sfar
Mehdi Sfar Network and Security Architect / CCDE #20210003 | CCIE R&S; #51583

I signed up for Orhan’s CCDE Self paced Course. This course, along with the CCDE In Depth book, helped me for my CCDE Practical as well as Written exams. It pushed me to ask the "WHY" questions and allowed ...

Related courses