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Only a few bytes of information to each ip packet in

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only a few bytes of information to each IP packet, in the form of an IPSec header, and it allows for quality-of-service (QoS) management on the network. Transport Mode is typically used when end-to-end encryption is required and supported by the peers and is deployed between or within locations. Transport Mode IP Packet (Utilizing ESP) Typical Transport Mode Data Exchange Tunnel Mode : Protection is provided for the entire IP packet, which is encrypted and then encapsulated in a new IP packet including a new IP header and an IPSec header. Tunnel Mode is typically used on IPSec gateway devices such as firewalls, routers, and VPN appliances connecting remote locations such as branch offices. The gateway acts as an IPSec proxy for the clients that are located behind the device. Clients forward IP packets to the gateway in the clear. The gateway device then encrypts the packet and forwards it to an IPSec peer, which in turn decrypts the packet and forwards it to the destination client. Tunnel Mode IP Packet (Utilizing ESP)
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