Troubleshooting Linux® Firewalls

Chapter 15. Web Services (Web Servers and Web Proxies)

In this chapter, we cover common firewall configurations for both network and host-only firewalls and web services. Specifically, we provide example configurations for “unless allow, deny” host-only firewalls, transparent web proxy servers, single and multi-IP forwarding configurations, filtering access to web servers and clients, as well as a typical road warrior forwarded configuration.

Common Questions

Q:	I have a DMZ web server or one running on my firewall itself. I can see it at home but not from work. What is going on?
A:	A great many ISPs filter out port 80 these days on their broadband networks. Before spending a great deal of time trying to debug your firewall, check with your ISP first ...