1. First, of all, you need to install the centosplus kernel. Enable the centosplus repository in /etc/yum.repos.d/CentOS-Base.repo, which you probably know how to do already. However, you must find the centosplus section in that file and set enabled=1
2. To install the centosplus kernel, just do a yum update kernel.
4. Reboot and you should be able to mount Novell shares. Note, however, that you might do something to iptables (like turning it off). I didn’t manage to keep a Novell share mounted with iptables running… Be warned, you turn off your firewall! If you are geeky enough, I’m sure you’ll find a way to make iptables handle ncpfs and ipxutils (Post a comment then, if it doesn’t involve recompiling the kernel…).