Skip to Main Content
Linux Server Security, Second Edition
book

Linux Server Security, Second Edition

by Michael D. Bauer
January 2005
Intermediate to advanced content levelIntermediate to advanced
544 pages
23h 44m
English
O'Reilly Media, Inc.
Content preview from Linux Server Security, Second Edition
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
26
|
Chapter 2: Designing Perimeter Networks
issue should be obvious: the firewall should be allowed to use all its available
resources for inspecting and moving packets.
Furthermore, even a painstakingly well-configured and patched application can have
unpublished vulnerabilities. (All vulnerabilities start out unpublished.) The ramifica-
tions of such an application being compromised on a firewall are frightening. Perfor-
mance and security, therefore, are impacted when you run any service on a firewall.
Where, then, to put public services so that they don’t directly or indirectly expose
the internal network and don’t hinder the firewall’s security or performance?
Answer: in a DMZ (demilitarized zone) network.
The Three-Homed Firewall DMZ Architecture
At its simplest, a DMZ is any network reachable by the public but isolated from
one’s internal network. Ideally, however, a DMZ is also protected by the firewall.
Figure 2-2 shows my preferred firewall/DMZ architecture.
In Figure 2-2, we have a three-homed host as our firewall. Hosts providing publicly
accessible services are in their own network with a dedicated connection to the fire-
wall, and the rest of the corporate network faces a different firewall interface. If con-
figured properly, the firewall uses different rules in evaluating ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Linux: Powerful Server Administration

Linux: Powerful Server Administration

Uday Sawant, Oliver Pelz, Jonathan Hobson, William Leemans
Linux Server Hacks

Linux Server Hacks

Rob Flickenger
Linux Server Hacks, Volume Two

Linux Server Hacks, Volume Two

William von Hagen, Brian K. Jones

Publisher Resources

ISBN: 0596006705Supplemental ContentCatalog PageErrata