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The differences between VPN and DMVPN


A VPN or Virtual Private Network secures the data using tunneling protocols and security procedures. 

However, individuals can also use VPNs to surf the web anonymously and avoid being tracked by their ISP or government. 

The most common types of VPN protocols are PPTP, L2TP/IPSec, SSTP, IKEv2/IPSec, and OpenVPN. 


DMVPN is a type of VPN that uses dynamic addressing to allow for more flexibility and scalability than other types of VPNs. It works by creating a virtual private network (VPN) between two or more devices, using a shared public IP address. This allows devices on the network to connect as if they were on a private network, even if they are not physically connected.

DMVPN uses mGRE (Multipoint GRE) to create tunnels between spoke routers. The mGRE is a type of tunneling that allows for multiple destination addresses. This means that data can be sent from one spoke router to another, even if they are not physically connected. 

Another benefit of DMVPN is that it uses NHRP (Next-Hop Resolution Protocol) to dynamically resolve next-hop IP addresses. Instead, it can just use the NHRP protocol to resolve the next-hop IP address automatically. This makes setting up and managing a DMVPN much easier than other types of VPNs.

VPN and DMVPN: Differences

VPNs (virtual private networks) and DMVPNs (Dynamic Multipoint Virtual Private Networks) are both popular methods for creating secure, private networks. 

A VPN acts as a connector, creating an encrypted tunnel between your device and the private network. This tunnel keeps your data safe from prying eyes as it travels back and forth between you and the network. A DMVPN also creates an encrypted tunnel, but it does so dynamically, using multipoint GRE tunnels. This makes it more scalable and flexible than a traditional VPN. Additionally, DMVPN uses mGRE (multipoint GRE) to allow for multiple spokes to connect to each other without the need for a full mesh topology.

IP usage

One key difference between a VPN and DMVPN is that DMVPN uses dynamic IP addresses rather than static ones. This makes it more difficult for someone to snoop on data as it travels between devices since the address is constantly changing. Additionally, DMVPN can be used to connect multiple sites together, whereas a traditional VPN typically only supports one-to-one connections.


A VPN is typically configured manually, by an administrator. DMVPNs, on the other hand, are designed to be much simpler to configure. 


Another difference between VPNs and DMVPNs is in their performance. VPN connections can slow down your Internet connection because all traffic must go through the VPN server. Data is sent directly between devices on the network, which can improve performance significantly.


Additionally, security is another area where VPNs and DMVPNs differ slightly. Both types of networks provide good security against eavesdropping and other attacks. However, because MVP uses dynamic encryption keys that change regularly, it may offer slightly better security than a traditional VPN


Another difference between these two types of networks is that DMVPN supports NAT (Network Address Translation), while most VPNs do not. 


When it comes to cost, VPNs are typically cheaper than DMVPNs. This is because DMVPN requires special hardware and software, which can add to the overall cost of the network. VPNs can be implemented using existing hardware and software, which makes them a more economical choice for small businesses or organizations on a tight budget.

If you need a simple, easy-to-configure network with good performance, then a DMVPN may be the right choice. 

Overall, DMVPN offers greater security and flexibility than traditional VPNs, making it an ideal solution for businesses with complex networking needs.

How is DMVPN dynamic?

DMVPN is a dynamic multipoint virtual private networking solution that allows remote sites to connect over the Internet without the need for a traditional VPN connection. DMVPN uses a combination of IPsec and GRE tunneling to provide a secure and efficient way to connect remote sites.

The main advantage of DMVPN is –  it is ideal for companies with high levels of mobility, such as those with multiple locations or with employees who travel frequently.

Another benefit of DMVPN is its scalability. With traditional VPNs, each new site added to the network requires a separate connection back to the central office. With DMVPN, however, all remote sites can share a single tunnel interface. This reduces complexity and increases efficiency as the network grows.

Overall, DMVPN is an ideal solution for companies looking for a flexible and scalable way to connect their remote sites.

What is Cisco DMVPN?

Cisco DMVPN is a Dynamic Multipoint VPN solution that enables users to connect to multiple sites over the Internet. Cisco DMVPN also supports dynamic routing protocols such as OSPF and EIGRP, which makes it a versatile solution for many different networking scenarios.

Cisco DMVPN is an ideal solution for organizations that need to connect multiple remote sites securely and efficiently. It is easy to deploy, scalable, and provides strong security protections.


  • Transport mode encrypts only the data portion of each packet, while tunnel mode encrypts both the header and the data. 
  • While creating Virtual Private Networks (VPNs) tunnel mode is used.

IPSec uses a security association (SA) to define security policies for each communication session. In SA, each IPSec peer must have a unique SA to communicate securely.

The Internet Key Exchange (IKE) protocol uses SA’s public-key cryptography to exchange keys between IPSec peers and establish SAs. IKE can also be used to periodically refresh keys to ensure continued security.

IPsec and DMVPN: Differences

One of the main differences between IPsec and DMVPN is that IPsec is typically used to create site-to-site VPNs, while DMVPN is often used to create point-to-multipoint VPNs.

Another key difference between the two protocols is that IPsec uses a pre-shared key for authentication, while DMVPN uses mGRE and NHRP for authentication.

Finally, IPsec requires each host to have a unique IP address, while DMVPN can be configured to use a single IP address for all hosts.

Find out How Cisco VPN Specialists Help

At FE, our Cisco VPN specialists can help you create a secure, reliable, and high-performance VPN connection. 

A fast and secure VPN connection is essential for any business or organization. Our CiscoVPN specialists can help you create a stable, reliable, and high-performance connection. Contact us today to get started!


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