02-22-2011
Also,
Please refrain from calling it "Linux 5." The Linux kernel is on version 2.6.3x. Red Hat puts out a distribution called "Red Hat Enterprise Linux" and you are likely on version 5 of that software. Calling it "Linux 5" can cause confusion, even if it is under the Red Hat forums.
That being said,
You may want to look into hosts.deny and perhaps iptables. Hosts.deny will disallow logins from certain areas and iptables can simply drop packets from a particular rule base, which can contain an IP address or range.
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LEARN ABOUT REDHAT
rhn_check
RHN_CHECK(8) Red Hat Network RHN_CHECK(8)
NAME
rhn_check - check for queued actions on RHN and execute them
SYNOPSIS
/usr/sbin/rhn_check [-v] [--verbose]
DESCRIPTION
rhn_check is a client program that connects to the Red Hat Network backend servers and retrieves information associated with the queued
actions for this particular system. This script reads the digital server ID from /etc/sysconfig/rhn/systemid and uses that to identify the
machine to the Red Hat Network. Upon successfull authentication, rhn_check will start processing the queued actions sequentially.
ACTION TYPES
The following types of actions are currently processed by rhn_check:
action type description
() ()
refresh This action will refresh the hardware or software profiles of this
machine with Red Hat Network. This fucntion is called as
refresh(hardware) or refresh(rpmlist)
new_systemid This action is used by the RHn Backend to update the Digital
system ID of this machine with a new one.
update_packages This action will trigger rhn_check into running a package
update for a list of packages queued from the Red Hat Network.
rhn_check will use modules from the up2date client to download
the packages, solve dependencies and install the on the system.
FILES
/etc/sysconfig/rhn/systemid The digital server ID for this machine if the system has been registered onto Red Hat Network. This file does
not exist otherwise.
/var/spool/up2date This directory is used by up2date to store package headers and RPM packages downloaded from Red Hat Network
SEE ALSO
man pages for up2date(8) and rhnsd(8).
AUTHORS
Cristian Gafton <gafton@redhat.com>
Preston Brown <pbrown@redhat.com>
()