Transport mode encrypts the data portion of the packet. It works between two different workstations running some kind of VPN software. Transport mode protects payload of packet and the high layer protocols. Transport mode leaves the original IP addresses in open clear text.

The work of transport mode is to encrypt the message in the data packet and the tunneling mode encrypts the whole data packet. IPSec can also be used with other security protocols to improve the security system. Layer 2 Tunneling Protocol (L2TP): The transport mode encrypts only the payload and ESP trailer; so the IP header of the original packet is not encrypted. The IPsec Transport mode is implemented for client-to-site VPN scenarios. NAT traversal is not supported with the transport mode. MSS is higher, when compared to Tunnel mode, as IPSec Transport mode: Only the payload or data of the original IP packet is protected (encrypted, authenticated, or both) in transport mode. The protected payload is then encapsulated by the IPsec headers and trailers while the original IP header remains intact and is not protected by IPsec. Client-side VPNs (AnyConnect, RDP) use transport mode because they set up end-to-end or end-to-site encryption. They do not rely on any other security infrastructure to create and maintain the tunnel. Tunnel mode is most often done between VPN gateways (routers) that maintain the tunnel without needing to install or configure the clients. Transport mode is implemented for client-to-site VPN scenarios. NAT traversal IS NOT supported with the transport mode. MSS is higher; Transport mode is usually with other tunneling protocols (GRE, L2TP) which is used to first encapsulate the IP data packet, then IPsec is used to protect the GRE/L2TP tunnel packets. EDITED:

Route Based VPN - SonicWall

The transport protocol is still GRE. Let’s verify this: On R1: R1# show interface tunnel13 | include Tunnel protocol Tunnel protocol/transport GRE/IP Task 4. Reconfigure R1 and R3 so that the tunnel protocol is IPSec; this way, the extra GRE overhead is no longer there. In order to eliminate GRE altogether, you can change the tunnel mode to Route Based VPN - SonicWall A policy-based approach forces the VPN policy configuration to include the network topology configuration. This makes it difficult for the network administrator to configure and maintain the VPN policy with a constantly changing network topology. Enable Transport Mode - Forces the IPsec negotiation to use Transport mode instead of Tunnel

In transport mode, the IP header, the next header, and any ports that the next header supports can be used to determine IPsec policy. In effect, IPsec can enforce different transport mode policies between two IP addresses to the granularity of a single port.

AWS VPN is comprised of two services: AWS Site-to-Site VPN and AWS Client VPN. AWS Site-to-Site VPN enables you to securely connect your on-premises network or branch office site to your Amazon Virtual Private Cloud (Amazon VPC). IPsec vs. SSL: What's the Difference? | SolarWinds MSP Apr 15, 2019 The TCP/IP Guide - IPSec Modes: Transport and Tunnel Transport Mode: IP header, IPSec headers (AH and/or ESP), IP payload (including transport header). Tunnel Mode: New IP header, IPSec headers (AH and/or ESP), old IP header, IP payload. Again, this is a simplified view of how IPSec datagrams are constructed; the reality is significantly more complex. IPSec vs SSL VPN – Differences, Limitations and Advantages Dec 27, 2018