how do I configure my RHEL5 or RHEL6 system to use ldap for authentication?

how do I configure my RHEL5 or RHEL6 system to use ldap for authentication? References I have root access to a RHEL6 system and I want to use the corporate ldap server where I work for user authentication. I ran authconfig-tui and checked [*] Use LDAP and left [*] Use Shadow Passwords checked, then I checked [*] Use LDAP Authentication then click the Next button and left [ ] Use TLS unchecked and set Server: ldap://ldap.mycompanysdomainname.com and set the Base DN to what the ldap admin guy told me to use. But I can only log in with the password I set locally on the box for my user account and cannot log on if I use that password that is stored on the ldap server. Isn\'t there something I need to do in the /etc/passwd file of the /etc/shadow files ... something like change the passwd field to red@mycompanysdomainname.com or something like that?