Wireshark is open source free networking tool. It can be downloaded for any operating system. After it’s installed, here is the first screen of Wireshark. To load any capture, go to Edit->Open and select the required capture to be displayed into Wireshark. Once any capture is loaded it will look like this. Now let’s understand some protocols and see packets into Wireshark.ĪRP protocol is used to get the MAC address of another device when you know the IP address of the another device. Let’s see below diagram to understand in simple way. Suppose device A knows the IP address of device B but does not know MAC address of device B. What should device A do? Here are the steps.ĪRP Request: Who has 192.168.1.2 tell me (A)? This is a broadcast packet-> Let’s see all three packets from Wireshark. We can use filter “tcp” to list out all tcp packets and the first 3 packets should be the 3-way hand shake packet. Here is the screenshot for SYN packet sent by client to server TCP SYNīasically SYN packet is sent to share client’s capabilities to server. Now server share it’s capabilities to client through SYN+ACK packet. So this packet is acknowledgement of SYN packet and also sharing server’s capabilities. If we compare SYN and SYN+ACK packet we can see differences between client’s and server’s capabilities. These informations are useful when client and server shares TCP data packets. This packet is just the acknowledgement from client. To discontinue existing TCP connection some packet exchanges occur between client and server. Quit without Saving to discard the captured traffic.If client wants to terminate connection then client can send FIN packet and server sends ACK.
Observe that only traffic to (destination) or from (source) IP address 8.8.8.8 is captured.Use ping 8.8.4.4 to ping an Internet host by IP address.Use ping 8.8.8.8 to ping an Internet host by IP address.Select Start to start a Wireshark capture.In the Capture Filter box type host 8.8.8.8.Double-click on the interface you want to use for the capture.Select either the Capture menu and then the Interfaces dialog box or the List the available capture interfaces toolbar button.To capture network traffic using a capture filter: These activities will show you how to use Wireshark to capture and filter network traffic using a capture filter.Īctivity 1 - Capture Network Traffic Using a Capture Filter Wireshark is a free and open source packet analyzer used for network troubleshooting and analysis. 3 Activity 1 - Capture Network Traffic Using a Capture Filter.
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