For VPN so play a role in various protocols, including PPTP, L2F and L2TP and IPSEC issues, the first three on the run-level Layer 2 and Layer 3 IPSec I am well aware that the so-called Layer 2 Data Link Layer (link layer) and Layer 3 Network Layer. Can someone please explain why IPSEC is running as a single Layer 3 and why is that and what is the advantage? Hoping that some members will lend a helpful hand for resolving this issue.
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