With ever increasing frequency network administrators are being pushed by management and end users alike to find a way to connect everyone to the Internet, while at the same time maintaining security and control over when, where and what users access.
Many problems arise when connecting a previously internal network to the Internet.
Unless we can provide security, management will not let us use the internet. When connected to the public Internet, we need to prevent the contamination of our internal resources from viruses and hostile applets. Our company does not have the budget for an expensive firewall system. I have too many PC's on my network to give them all valid IP addresses. My network provider can only give me one valid IP address.