In Negot - The currently negotiating connections. High Water - The highest number of concurrent active connections since the last reboot. Running Total - The total number of successful connections since the last reboot. Tunnel Starts - The number of tunnel starts. Tunnel OK - The number of tunnels for which there were no errors.
Tunnel Error - The number of tunnels with errors. Contents Introduction. Current configuration : bytes! It can be used alone when you need to confirm the identity of the sender and protect data from modification, but confidentiality is not required.
Encapsulating Security Payload ESP : This provides authentication and integrity and also encrypts the data for confidentiality. ESP does not usually sign the entire packet unless used in tunneling mode as described below , so only the data itself is protected; the IP header is not. AH and ESP can be used together to provide the signing of the entire packet along with encryption of the data. The tunneling process is technically termed encapsulation. In transport mode, IPSec provides end-to-end security from the originating computer to the final destination.
However, SSL and many other network security methods operate at the higher layers of the OSI reference model, which requires that applications sending or receiving the secured communications must be designed to work with SSL. These are called SSL-aware applications. This means applications do not have to be specially written to take advantage of IPSec.
Link layer encryption works at the Data Link layer; its drawback is that it does not provide end-to-end protection on a routed network. IPSec security associations IPSec must be supported on both the sending and the destination computers in order to establish a secure exchange of data. These two systems first create a security association SA , which is a negotiated agreement about how the data will be protected and exchanged.
A security association is made up of keys generated by the Oakley service on each computer and policies, which define the mechanisms for protecting the communication.
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