Solaris Logging: User authentication and Telnet sessions

I recently had a customer ask for a log of all telnet sessions from machine A to machine B.  Unfrotunately I'm not sure how to log this info, but realize that this may become very useful in the future.  Is there a way to log all user logins and each telnet of ftp session a user may initiate to the specifc ip.  I would prefer to do this without third party software if thats possible.  Thanks.
mykerAsked:
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shivsaCommented:
man last.
last command automatically logs all the telnet and login session logged to the system.

just type
#last
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