RHEL 2.1: <- RedHat 7.2
kernel 2.4.9,glibc 2.2.4
RHEL 3: <-RedHat 9
kernel 2.4.21,glibc 2.3.2
RHEL 4: <-Fedora Core 3
kernel 2.6.9,glibc 2.3.4
RHEL 5: <-Fedora Core 6
kernel 2.6.18,glibc 2.5
RHEL Derivatives:
(1) CentOS
(2) Scientific Linux
