Ports Used for IPSec (2024)

Ports Used for IPSec

Updated on

Jul 17, 2024

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Updated on

Jul 17, 2024

Focus

Download PDF

Destination Port	Protocol	Description
500	UDP	Port used by IKE on the management planeto connect with remote IKE peers.
4500	UDP	Port used by IKE on the management planeto connect with remote IKE peers.
4510	UDP	Port used by the dataplane to send requeststo IKE.
4511	UDP	Port used by the dataplane to send requeststo keymgr .

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FAQs

Ports Used for IPSec? ›

IPSec VPN. IPSec VPN is a layer 3 protocol that communicates over IP protocol 50, Encapsulating Security Payload (ESP). It might also require UDP port 500 for Internet Key Exchange (IKE) to manage encryption keys, and UDP port 4500 for IPSec NAT-Traversal (NAT-T).

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What ports are used by IKEv2? ›

IKEv2 uses non-standard UDP ports so you need to ensure that these ports are not blocked on the user's firewall. The ports in use are UDP 500 and 4500.

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Is IPsec 4500 TCP or UDP? ›

Port 4500, often paired with the UDP protocol, is fundamental in the deployment of IPsec VPNs, serving as a conduit for secure communications across internet protocols.

What are the 3 main protocols that IPsec uses? ›

Some IPSec protocols are given below.

Authentication header (AH)
Encapsulating security payload (ESP)
Internet key exchange (IKE)

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What ports does NAT IPsec use? ›

For IPsec to work with NAT traversal, these protocols must be allowed through the NAT interface(s): IKE - UDP port 500. IPsec NAT-T - UDP port 4500.

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What ports are used by IPsec and L2TP? ›

By default, L2TP uses IPSec, which requires UDP ports 500 and 4500, and ESP IP Protocol 50. If you disable IPSec, Mobile VPN with L2TP requires only UDP port 1701.

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Is IKEv2 TCP or UDP? ›

As IKEv2 uses UDP, it has relatively low latency and will be a speedy option for most use cases. It also isn't very demanding for performance, so works well on weaker hardware devices.

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Is IPsec over TCP or UDP? ›

Transmission: Encrypted IPsec packets travel across one or more networks to their destination using a transport protocol. At this stage, IPsec traffic differs from regular IP traffic in that it most often uses UDP as its transport protocol, rather than TCP.

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What port and protocols are required for IPsec? ›

IPSec VPN. IPSec VPN is a layer 3 protocol that communicates over IP protocol 50, Encapsulating Security Payload (ESP). It might also require UDP port 500 for Internet Key Exchange (IKE) to manage encryption keys, and UDP port 4500 for IPSec NAT-Traversal (NAT-T).

Which VPN protocol is best for IPsec? ›

IKEv2/IPSec's ability to connect quickly makes it great for mobile phones using cellular data. L2TP/IPSec is best for manual VPN configuration since it's easy to set up.

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What ports does Cisco AnyConnect use for IPSec? ›

Ports Required for VPN to Connect KB0015544

Protocol	Cisco AnyConnect Client Port
TLS (SSL)	TCP 443
SSL Redirection	TCP 80
DTLS	UDP 443
IPsec/IKEv2	UDP 500, UDP 4500

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What port does IPSec IKE use by default? ›

Traffic on UDP port 500 is used for the start of all IKE negotiations between VPN peers. This is true of all IPSec platforms. In some cases, UDP port 4500 is also used.

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How to port forward IPSec? ›

IPSecVPN: From the Port Forwarding screen, set Local Port to 500 and Protocol to UDP for IPSecVPN tunnel, and then set Local Port to 4500 and Protocol to UDP for IPSec tunnel.

Get More Info Here ›

What protocol does IKEv2 use? ›

In computing, IKEv2 is a VPN tunneling protocol ensuring safe online communication between two devices. IKEv2 works with the IPsec protocol, forming a VPN protocol called IKEv2/IPSec. IKEv2 helps devices recognize each other, and the IPsec protocol provides security when transporting data.

What ports does Azure VPN IKEv2 use? ›

IKEv2 VPN: A standards-based IPsec VPN solution that uses outbound UDP ports 500 and 4500, along with IP protocol number 50.

What ports and protocols does IKE use? ›

The IKE protocol uses UDP packets, usually on port 500, and generally requires 4–6 packets with 2–3 round trips to create an ISAKMP security association (SA) on both sides. The negotiated key material is then given to the IPsec stack.

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What port does a TLS VPN typically use? ›

This informs the client and server involved that the TLS protocol will be used in the data transfer. Browsers can make a direct request, or they can just open a port used by TLS. This is generally port 443.