Can anyone clearly explain that what is the difference between L2TP and GRE tunnel?
Is L2TPv3 Any different
I am trying to understand where these protocol are used and why we use L2TP instead of GRE in some cases and vice versa.
Network Engineering Stack Exchange is a question and answer site for network engineers. It only takes a minute to sign up.Sign up to join this community
L2tp and GRE are totally diffrent protocols
GRE is a simple IP packet encapsulation protocol. a GRE tunnel is used when packets need to be sent from one network to another, without being parsed or treated like IP packets by any intervening routers. a GRE tunnel interface comes up as soon as it is configured and it stays up as long as there is a valid tunnel source address or interface which is up.
L2TP is a tunneling protocol (used to support VPNs) that allows multiplexing of multiple PPP sessions between two IP-connected endpoints, and a control protocol for dynamically establishing and maintaining the emulation of these PPP sessions. This is very different than GRE.