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IKEv2 vs IPSec


Virtual private networks (VPNs) have become an essential tool for protecting your online privacy and security. VPNs work by creating an encrypted tunnel for your internet traffic, preventing third parties from accessing your data. This tunnel connects your device to a remote server operated by the VPN service.

There are many different protocols used to establish this encrypted VPN connection, each with their own strengths and weaknesses. Two of the most common protocols are Internet Protocol Security (IPSec) and IKEv2. Understanding how they differ can help you choose the best VPN option for your specific needs.

This guide will provide an in-depth comparison of IKEv2 and IPSec – from the technical details of how they operate to their speed, security, compatibility and more. Read on to determine which protocol meets your requirements for a fast, stable and private VPN connection.

What is IPSec?

Internet Protocol Security (IPSec) is one of the most widely used VPN protocols. It was created in the 1990s as an extension of the Internet Protocol (IP) to add encrypted communication capabilities.

IPSec establishes a secure channel for traffic between devices through:

  • Authentication – Verifies the identity of the VPN server
  • Confidentiality – Encrypts data to prevent eavesdropping
  • Integrity – Checks messages weren’t altered in transit

This is accomplished using mechanisms called Security Associations (SAs). An SA is a shared policy between devices specifying the exact encryption, hash authentication, and key exchange methods to use to secure a VPN connection.

Encryption & Security

IPSec offers robust encryption to protect VPN traffic. Supported algorithms include:

  • Symmetric Cryptography: AES, DES, 3DES
  • Asymmetric Cryptography: RSA, DSA
  • Hash Algorithms: SHA-1, SHA-2

256-bit AES is generally used today as the gold standard – extremely difficult for attacks to crack yet fast enough for good performance.

Security researchers have found some weaknesses in older IPSec encryption methods like MD5 hashes. But modern implementations use the more advanced SHA-2 algorithm to prevent attacks.

Speed & Performance

IPSec has minimal impact on internet speeds compared to other protocols. Exact performance depends on the encryption cipher used.

Light ciphers like AES-128 maintain quick speeds but AES-256 and SHA-384 offer better security at the cost of reduced speeds. IPSec may achieve anywhere from 10Mbps to over 200Mbps under optimal conditions.

Ports & Firewall Traversal

IPSec uses several standard ports for establishing VPN connections:

  • UDP Port 500 – For IKE to negotiate SA parameters
  • UDP Port 4500 – Optional, providing NAT traversal capabilities
  • Protocol 50 & 51 – Encryption and authentication of IP Packets

Operating system firewalls usually allow these ports by default. But network firewalls may need manual configuration to open them up for IPSec to function.

What is IKEv2?

IKEv2 (Internet Key Exchange version 2) is a key component of the IPSec protocol suite responsible for setting up the encrypted VPN tunnel.

Specifically, IKEv2 handles the initial authentication and Secure Association (SA) negotiation between the VPN client and VPN gateway before routing traffic.

Improvements Over IKEv1

IKEv2 represents a major overhaul over its outdated predecessor IKEv1. Improvements include:

  • Faster connection establishment – Authenticates and sets up SAs much quicker
  • Better reliability – Self-healing capabilities restore VPN stability
  • Efficient rekeying – Keys can be refreshed without re-authenticating
  • Support for mobile – Maintains connections efficiently on mobile networks

This makes IKEv2 well-suited for devices connecting from frequently changing networks where reliability is critical.

Strong Security

In addition to all standard IPSec ciphers, IKEv2 supports added encryption algorithms like AES-GCM for greater security. Other standards allow encryption keys to be refreshed every hour for high entropy. Weak hashing methods like SHA-1 are no longer used.

Several mechanisms help ensure data security:

  • Mutual authentication
  • Extensible Authentication Protocol (EAP)
  • Advanced encryption standard (AES-CBC) with secure hashes

Mobility & Multi-homing Support

A unique capability of IKEv2 is integration with the Mobility and Multi-homing Protocol (MOBIKE). This allows established VPN connections to continue uninterrupted when:

  • Switching between networks
  • Moving between WiFi and mobile data
  • Transitioning IP addresses

This prevents the VPN tunnel from dropping on networking changes.

The IKEv2/IPSec Combination

Given the strengths of IKEv2 for authentication and connection setup, it is now commonly paired with IPSec for encrypting data transmission. This takes advantage of both protocols’ individual advantages.

The joint IKEv2/IPSec combo exhibits several desirable VPN characteristics:

Speed – IPSec minimally reduces connection speeds while IKEv2 quickly establishes tunnels.

Security – Extensive encryption and hashing functions protect against attacks.

Reliability – Self-healing connections stay active across network transitions.

Compatibility – Support across nearly all modern platforms from Windows and iOS to Android.

Many consider IKEv2/IPSec to be among the top protocol choices today due to these blended advantages.

Comparison with Other Protocols

How does IKEv2/IPSec stack up against alternatives like OpenVPN, L2TP/IPSec, and PPTP? Here’s an overview:

OpenVPN – Highly configurable open-source protocol. More vulnerable if not properly configured but fast speeds likely. Good choice for technical VPN users.

L2TP/IPSec – Combines IPSec with Layer 2 Tunneling Protocol. Built-in to most operating systems but slower than IKEv2. Weak security without additional IPSec encryption.

PPTP – Extremely outdated point-to-point tunneling protocol. Compatible on old systems but highly insecure encryption vulnerable to attacks. Not recommended.

The integrated encryption, hashing, and NAT-traversal support with IKEv2 makes it more robust and secure than SSL/TLS-based OpenVPN setups. And much faster performance than the dated PPTP or base L2TP protocols give it an advantage for streaming and downloads.


Choosing the most appropriate VPN protocol depends on your specific needs and priorities – there is no one “best” option for everyone.

IKEv2 offers a great balance of speed, security, stability and widespread compatibility. But properly configured OpenVPN setups can also deliver strong encryption with faster speeds.

In most cases today, IKEv2 or OpenVPN are preferable over dated solutions like PPTP or base L2TP tunnels. Analyze your requirements around privacy needs, connection reliability, speed vs security tradeoffs, and client support to pick the optimal protocol.

As cybersecurity threats escalate, using the most modern and advanced VPN protocols becomes increasingly important. Both IKEv2 and IPSec present great options for encrypting traffic and hiding your online identity – with IKEv2 offering enhanced reliability vital for mobile devices. Hopefully this overview gives you the knowledge to determine which solution best secures your digital communications according to your priorities.