The following statement about IPSec VPN is correct

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Ted Kang · Accepted Answer

The two routers establish IPSecVPN in main mode, and from the 5th message (included), the payload's data is often encrypted.

Ted Kang · Accepted Answer

The two routers can establish an OSPF neighbor relationship through the IPSec VPN (19) channel and exchange intranet devices by

Ted Kang · Answer

Brutal mode can support NAT traversal, while main mode does not support NAT traversal.

Ted Kang · Answer

Two routers establish an IPSec VPN in brutal mode, so that the tunnel is built with a minimum of 4 messages interacting between the two devices.

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