The security options in Linux that can be applied to users and groups are 
typically applied to  fence off  the login environment of the end user. The end 
user does not, by default, have administrative access to the operating system on 
the client.
Bugfix response time
A large factor in responding to security exploits is the time to fix. The risk related 
to an exploit is directly related to the time the security  hole  is available to people 
who want to exploit it. Since most if not all components in a Linux client are open 
source software, fixes will either come from the open source community or from 
an enterprise vendor that offers this kind of support. It has been shown that the 
time to fix security exploits in the Linux kernel is quite short. 
Also, since the source is open it is possible for an organization to develop a 
bugfix on its own, test it and deploy it internally, and even share the modified 
source code with the OSS development community for consideration
Firewall support
The Linux kernel has firewall services built into the kernel. As of Version 2.4 of 
the kernel, this firewall is called iptables. Configuring iptables correctly enables 
the administrator to implement a network security policy on the Linux client. 
Iptables firewalling can be used to secure the Linux client in the following areas:
Protection against worm viruses.
Prevent end users from using protocols not allowed by policies.
Secure against known exploits.
2.1.2  Costs related to Linux client
The different cost factors related to the client are fairly general and independent 
of the operating system, but the relative impact and size of these cost factors can 
be highly dependent on the client operating system. Cost factors to consider for a 
Linux migration include:
License and support cost for the Linux distribution
Hardware cost
Application cost for the base desktop client
Management and support cost
Migration cost
License and support cost for the Linux distribution
The Linux kernel and most applications included in Linux distributions are open 
source and licensed under the GNU Public License (GPL). This means that the 
software is freely distributable. Therefore there are no license costs per se 
related to the Linux client.
14 
Linux Client Migration Cookbook   A Practical Planning and Implementation Guide for Migrating to Desktop Linux






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