You do not need to implement IPSec to encrypt your data transmissions between two machines. TLS & SSH allow you to encrypt transmissions on a per application basis. SUN's LDAP client can be configured to use TLS encryption so the logon credentials are sent encryped to/from the LDAP server. SSH allows a complete session to be encrypted between client and server. With IPSec, any application that transmits data between two endpoints is encrypted even if the application has no mechanism to do this normally. An example of this would be telnet.


If you do decide to use IPSec then do some research and decide if adding a crypto accelerator card to your machine is a good idea or not.


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