Assessing your Organization’s Network Perimeter (pt. 2)

Step 6:
Based on the analysis performed in Step 5 document all your observations based on an endpoint level as well as a level for each purpose and function. For continuity these observations should be captured on the same spreadsheet we have been using. Please note that observations can apply to multiple purposes and functions and is acceptable.

I hope this article has been helpful as I have tried to provide as much guidance as I could in a limited format. Please join me next time when we review the Step 3 of assessing your perimeter “Assess the Processes used to support your network perimeter”.

One Comment

  1. Rene w/ NCP Jun 17, 2008 at 2:44 pm | Permalink

    What should be mentioned as (one of the many) details would be that users within a company using WLAN although physically within the confines of the building are to be treated as remote access users. Someone outside on the street with a laptop and a malicious intent should be able to detect and possibly participate within the WLAN if not secured enough, as if they’re within the building and as one of the users. It’s therefore imperative to realize that physical and virtual perimeters do not necessarily coincide!

    Another point would be how far do I want to ‘extend the perimeter’ and use the right ‘technology’ to fulfill the requirements:

    Incidental access to internal resources can best be facilitated with SSL-VPN access. This allows for a limited access to internal resources by those that need it; such as suppliers/consultants/contractors and so on. This doesn’t require the user to install a ‘client’, but merely downloads the code within the browser and uses the browser to access the internal resources, and this access can be carefully controlled centrally on the SSL-VPN gateway.

    Conversely a full time employee may require to have access to the ‘regular’ resources he would normally have at his desk, while he’s on the road. An ‘full access’ or ‘LAN emulation’ (working remotely as if one is sitting at one’s desk) VPN solution would be a better suited option. This would imply that the latter’s work platform is secured; not only the communication between the two points, but the remote user’s device has become an extension to the corporate network perimeter; and thus should be protected accordingly. Why attack the corporate ‘perimeter’ firewall, when one can attack and possibly use a remote access user’s machine as a stepping stone into the corporate network?!

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