Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium



Posted on 2005-03-16
Medium Priority
Last Modified: 2012-06-27
I have a 3com switch and want to monitor traffice using third party software.  My question is how can I do that with the switch?  I want to be able to monitor instant messenging and web sites and stuff like that.  Could somoene give me instructions on how to set it up or what I need in order to set it up.  Thanks
Question by:Rosen500

Expert Comment

ID: 13556813
If the switch has snmp abilities you can monitor network information about the switch using something like mrtg.  You would not be able to monitor instant messaging and web sites using that, at least not to my knowledge.  However, it sounds like you want a proxy server, which would allow you to do this.
LVL 10

Accepted Solution

ngravatt earned 1000 total points
ID: 13557377
on cisco switches you can setup port mirroring.  For each port, you can mirror the traffic to your network port and then use a network sniffer program to look at all the traffic on your port.  Also, take a look at this product:


this product is designed to look at all your network traffic and tell you what websites users are going to.  You can download the free evaluation from the website.  They have instructions on how to setup the software so you can see all your network traffic.

Assisted Solution

Suertreus earned 1000 total points
ID: 13561065
I strongly recommend Ethereal (http://www.ethereal.com)- a free/open source win32/linux packet sniffer with good filtering capability as well as built-in protocol handlers so you can easily monitor AIM (et al) and HTTP traffic, particularly AIM message text and HTTP domains visited.  You would be able to trace the packets to the machine from which they came (by MAC, IP, and optionally DNS addresses) if you're looking to bust somebody =P.  It will capture in promiscuous mode, but that isnt likely to be able to see all traffic on a switched network without some pushing and shoving (I've heard that most switches can be fooled into divulging 'private' information as switching is more for speed than privacy anyway).  In your case I would recommend putting Ethereal on a machine upstream of the clients in question that either retransmits the packets itself (i.e. a box running NAT (iptables/routing & remote access/internet connection sharing host) like I use) or on a machine on a non-switched network (i.e. a hub) somewhere upstream that will see the packets en-route.  If you must opt for the latter note that the packets will be much harder to trace to specific clients if you are so far upstream that there is a layer of NAT between the sniffer and the clients.  Good luck!

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to fix a SonicWall Gateway Anti-Virus firewall blocking automatic updates to apps like Windows, Adobe, Symantec, etc.
LinkedIn blogging is great for networking, building up an audience, and expanding your influence as well. However, if you want to achieve these results, you need to work really hard to make your post worth liking and sharing. Here are 4 tips that ca…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…

564 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question