since we already use Novell's SMT tool for updating SLES servers and we dont have expanded support to use SMT for updating RHEL, we have to go with RHN or up2date. As per my intial understanding from docs, RHN is for V5.x and YUM or up2date is for 1.x,2.x,3.x adn 4.x. is right. if so we have mixed of 4.x and 5.x RHEL servers. since I'm much experienced with RHEL, I'm kinda confusing. any help would be appriciated.

what are the steps we need to take if we want to go with RHN or Up2date or YUM. Thanks