Policy Based VPN vs Route Based VPN: Know the Difference

Rashmi Bhardwaj | Blog,BUZZ,Security

Policy based VPN & Route based VPN –

While planning for VPN setup, it is imperative to have an understanding of differences between 2 VPN types – Policy based VPN and Route based VPN.

Just a brush-up on both VPN types and then we can detail how both terms differ from each other.

Policy based VPNs encrypt a subsection of traffic flowing through an interface as per configured policy in the access list. The policy dictates either some or all of the interesting traffic should traverse via VPN.



In distinction to a Policy-based VPN, a Route-based VPN works on routed tunnel interfaces as the endpoints of the virtual network. All traffic passing through a tunnel interface is placed into the VPN. Rather than relying on an explicit policy to dictate which traffic enters the VPN, static and/or dynamic IP routes are formed to direct the desired traffic through the VPN tunnel interface.

Related – Top 100 VPN Interview Questions

Difference between Policy based VPN and Route based VPN –

Policy-based VPNs encrypt and encapsulate a subset of traffic flowing through an interface according to a defined policy (an access list).
A route based VPN creates a virtual IPSec interface, and whatever traffic hits that interface is encrypted and decrypted according to the phase 1 and phase 2 IPSec settings.
Numbers of VPN tunnels are limited by the number of policies specified
Numbers of VPN tunnels are limited to either route entries or number of tunnel interface specified which are supported by the device.
Dynamic Routing support
The exchange of dynamic routing information is not supported in policy-based VPNs.
Supports dynamic routing over the tunnel interface.
Policy Control
“Deny” of traffic flowing through the VPN tunnel can’t be configured.
“Deny” of traffic flowing through the VPN tunnel can’t be configured.
Network topology
Supports P2P network topology while Hub and Spoke topology is not supported
Supports Hub-spoke , P2P and P2MP network topologies
Security Association status
Forms SAs in response to interesting traffic matching policy (and will eventually tear down the SAs in the absence of such traffic).
The SAs for a route-based VPN are always maintained, till corresponding tunnel interface is up.
Use case
Common reasons to use a Policy-based VPN:
* The remote VPN device is a non-Juniper device
* Need to access only one subnet or one network at the remote site, across the VPN.
Common Reasons to use a Route-based VPN:
* Source or Destination NAT (NAT-Src, NAT-Dst) needs to occur while it traverses the VPN.
* Overlapping Subnets/IP Addresses between the two LANs.
* Hub-and-spoke VPN topology.
* Design requires Primary and Backup VPN.
* A Dynamic Routing Protocol (that is OSPF, RIP, BGP) is running across the VPN.
* Need to access multiple subnets or networks at the remote site, across the VPN.
NATting of VPN traffic
Traffic flowing through the VPN tunnel can’t be NATTed
Traffic flowing through the VPN tunnel can be NATTed since it passes through either the tunnel interface or gateway IP address specified as next-hop in routing.
Remote Access VPN
Remote access VPN can be implemented with policy based VPN.
Remote access VPN can’t be implemented with Route based VPN
Vendor Agnostic
Policy based VPN might be supported by the vendors which doesn’t support the route based VPN
Route based VPN might not be supported by all the vender’s devices
Addition of new network
Tunnel policies are to be configured if there is added a new IP networks
Routing is to be configured for new network if there is static Route to remote location

Download the difference table here.








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Frequently Asked Questions (FAQs)

Q: Do I have to set up my VPN manually?

A: Most VPN apps offer automatic installation, making the setup process quick and easy. You don’t usually have to configure the VPN manually.

Q: What is the best VPN?

A: The best VPN for you depends on your specific needs and requirements. Factors to consider include privacy features, server locations, connection speed, and customer support. Conduct thorough research and read reviews to find the VPN that suits you best.

Q: Will I have to pay for a VPN?

A: While there are free VPNs available, they often come with limitations and may not provide the same level of security and privacy as paid VPN services. Paid VPNs generally offer more reliable and faster connections, as well as better customer support. However, most VPN services are affordable and can range from $10 to $13 per month, depending on the subscription plan.

Q: Why is my internet slower after setting up my VPN?

A: When using a VPN, your internet speed may be slightly slower due to the encryption and routing processes. The added layer of security and privacy provided by the VPN outweighs the minor decrease in speed.

Q: Should I get a dedicated IP address add-on?

A: Depending on your usage, a dedicated IP address add-on may be beneficial. It provides you with a unique IP address that is not shared with other VPN users, reducing the risk of being affected by actions of other users. This add-on is particularly useful for business purposes.

Q: What can I access with a VPN?

A: VPNs allow you to access geographically restricted content and bypass government censorship. You can use a VPN to access region-locked websites, streaming services, and other online content that may not be available in your location.


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