There is little excuse for not installing an IDS (Intrusion Detection System) on your Network, even the usual culprit of budget doesn’t apply.  In fact one of the leading IDS systems called Snort is actually available completely free of charge and is sufficient for all but the most very complex network infrastructures.    It is virtually impossible to effectively monitor and control your network, particularly if it’s connected to the internet, without some sort of IDS in place.

There are certain questions about the day to day operation of your network that you should be able to answer.  Questions like the following will help you determine if you really have control over your network and it’s hardware =

  • Can you tag and determine how much traffic on  your network is associated with malware or unauthorised software.
  • Are you able to determine which of your clients do not have the latest client build?
  • Can you determine which websites are most popularly requested.  Are these requests from legitimate users or as a result of malware activity.
  • Can you determine which users are the top web surfers (and is it justified).
  • How much mail are your SMTP server’s processing?

It is surprising how many network professionals simply wouldn’t have a clue about obtaining this information from their network however, it’s impossible to ensure that the network is efficient without it.  For example a few high intensive web users can create much more traffic than the majority of ordinary business users.   Imagine two or three users in a small department who used a working BBC VPN to stream TV to their computer 8 hours a day.   The traffic that would generate would be huge and could easily swamp an important network segment.

All security professionals should ensure that they have the tools and reporting capacity to answer simple questions like this about network usage.   Knowing the answers to these questions, will help control and adapt your network to meet it’s users needs.   Of course a simple IDS won’t provide the complete solution but it will help keep control in your network.  Malware can sit and operate for many weeks in a network which is not monitored properly.  This will heavily impact performance and can enable it to spread to other devices and eventually other networks.  In network environments where performance is important, then being aware of the sorts of situations can make a huge difference.

John Williams

Network Professional and Broadcaster on author of BBC News Streaming.

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