Yes I've been battling with this too!
1) The iso's were unpacked as per the Red Hat manual "188.8.131.52. Using ISO Images for NFS Installs". http://www.redhat.com/docs/manuals/l...stall-net.html
2) NFS setup and the url given as "nfs:127.0.0.1:/path/to" per the manual. This did not work.
3) Also tried "http://anorien.csc.warwick.ac.uk/mirrors/centos/4.4/os/i386/" which did not work.
4) Tried this "http://download.fedora.redhat.com/pub/fedora/linux/core/6/i386/os/" which is taking a month of Sundays to come back and besides I require an Enterprise Linux install...
Will log a thread on the Fedora Forums for this.