Next, let’s fire up Putty, as it will let us connect to our Cisco 1751 router via Telnet over the local network. In our case this will be Ethernet, as we’re currently plugged into the network via an Ethernet cab. The very first step for us is to open Wireshark and tell it which interface to start monitoring. By using Wireshark, we will see what data we can find on the network relating to any network communications. Let’s look at an example using Telnet to log onto a Cisco Switch. Inspecting the contents of data packets.Isolating and identifying source and destination traffic.We can then open the capture results and see how we would go about capturing such information, as well as where we can find it in our results. Our example will show you how to reveal a plain-text password being transmitted over your network via Telnet, which will be intercepted by Wireshark. This is not an exhaustive or all-encompassing tutorial, but hopefully will help to shed light on the steps that most people might take when trying to pinpoint details about a particular application or packet stream on the network. What follows is a basic walkthrough of some of the steps you might follow when undertaking a preliminary investigation of a specific target on your network, and how it might benefit you depending on the objective in mind. It is a freeware tool that, once mastered, can provide valuable insight into your environment, allowing you to see what’s happening on your network. This can be done through the use of RSPAN.Wireshark is a very useful tool for information security professionals and is thought of by many as the de facto standard in network packet and protocol analysis. You can set up a place where you can have a wireshark computer set up and you can monitor any port in the network. Then there are several other ways of using fx packet capture in the ASA and then export it and look at it in wireshark. The monitor port can not send data out to the switch anymore but it will recieve all that the source port sees and sends. Monitor session (same as session above) destination interface (and add the interface you want to send the traffic out on fx gig1/0/2)Ī tip, if you are to use a monitor port on a swithc set a empty rj45 connection in the destination switchport if you leave it configured so that you or someone else does not use it by mistake. Monitor session (session number fx 1) source interface (and add the interface you would want wo listen to fx gig1/0/1)Īnd then you set up the port you want your wireshark to be connected to The command for this on fx a 3750 would be something like this) To use wireshark on a Network in its simplest form you configure a SPAN port at the local switch.
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