Firewalls: Jumpstart for Network and Systems Administrators

Section V: Secure External Services Provision

Chapter List

Chapter 11: Publicly Accessible Servers Implementation
Chapter 12: Architecture Selection
Chapter 13: External Servers Protection

11.1 Chapter Objectives

  • Types of server environments

  • Remote versus self-hosted

  • Types of web server-specific attacks

  • E-mail servers

11.2 Securing Your Organization s Internet Site

Connecting to the web can be hazardous. Even when all precautions are taken firewalls installed and regularly updated, policies created, and application protocols filtered it only takes one user clicking on something hazardous to open the door to mayhem. For now, though, attention must be turned to the outside, to that which lurks just outside, on the doorstep to the Internet. Many organizations have both the technical and the financial resources to host their own web site. Budget aside, there are many points that need to be considered when deciding whether to host a web server on-site. Figure 11.1 demonstrates the difference between a locally hosted web site and one that is co-located and possibly managed by an external service. Budgets have a way of doubling and tripling as unexpected problems arise that must be addressed. What may seem like a small equipment and time investiture can escalate into massive overtime and software and capital expenditures.


Figure 11.1: A web server in a demilitarized zone (DMZ)-style arrangement, tandem to a private network, contrasted with a privately managed web site provider. Distinct advantages and disadvantages exist in either method.

11.2.1 Pros and Cons

Most often, evaluating business Internet requirements with respect to the decision of hosting on-site

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