Which port is used to establish the Layer 2 Tunneling Protocol?

UDP port 1701
Layer Two Tunneling Protocol (L2TP) uses UDP port 1701 and is an extension of the Point-to-Point Tunneling Protocol. L2TP is often used with IPSec to establish a Virtual Private Network (VPN). Point-to-Point Tunneling Protocol (PPTP) uses TCP port 1723 and IP protocol 47 Generic Routing Encapsulation (GRE).

Which of the following is the Layer 2 Tunneling Protocol?

L2TP
Layer 2 Tunneling Protocol (L2TP) is a computer networking protocol used by Internet service providers (ISPs) to enable virtual private network (VPN) operations. L2TP is similar to the Data Link Layer Protocol in the OSI reference model, but it is actually a session layer protocol.

How does Layer 2 Tunneling Protocol work?

L2TP uses packet-switched network connections to enable endpoints to reside in different machines. The user has an L2 connection to a LAC, which tunnels individual PPP frames to the NAS. As a result, packets can be processed separately from the location of the circuit termination.

What is PPTP port?

PPTP Protocols PPTP uses General Routing Encapsulation tunneling to encapsulate data packets. It uses TCP port 1723 and IP port 47 through the Transport Control Protocol. PPTP supports up to 128-bit encryption keys and Microsoft Point-to-Point Encryption standards.

What is GRE port number?

GRE is a transport layer protocol, designated as IP protocol number 47, is used by many routers, WAN switches and VPN concentrators, to effectively tunnel traffic over a WAN between routers.

Is IPSec a Layer 2 tunneling protocol?

If this combination is chosen for the VPN, Layer 2 Tunneling Protocol/IPSec (L2TP) uses IPSec for data encryption. (L2TP/IPSec is usually pronounced as L2TP over IPSec.) The L2TP encapsulation, like PPTP, works with a PPP frame but provides two layers of encapsulation.

What ports does IKEv2 use?

By default, IKEv2 uses IPSec, which requires UDP ports 500 and 4500, and ESP IP Protocol 50.

What is UDP 500 port?

UDP port 500 is the ISAKMP port for establishing PHASE 1 of IPSEC tunnnel. And UDP 500 is for ISAKMP which is used to negotiate the IKE Phase 1 in IPSec Site-to-Site vpn & is default port number for isakmp, used when there is no NATing in the transit path of the vpn traffic. This is why we need UDP 4500.