![]() To do that, put "port 53" into the capture filter box (not display filter) that is visible from Capture->Options. Use wireshark to capture just DNS packets (which are UDP packets on port 53). If you aren't seeing any traffic, open a browser and start accessing some Web sites. Stop after you've captured a few hundred and take a look at the kinds of traffic. Click on the Pseudo-device that captures on all interfaces - it will start capturing traffic, and show the count of the number of ethernet frames captured of varying types. If you are unable to click on anything in wireshark after starting it, look for a hidden dialog box behind wireshark. Note that this program requires root access (and so will ask you for the root password when started from a regular account). Run yum install wireshark-gnome to install the gnome-based front-end to wireshark (say yes to install the packages requested and any dependencies). ![]() Since you likely don't have wireshark installed in /usr/sbin/wireshark, you'll need to install it first. Use wireshark to monitor your computer's traffic on the network. As a result, use of such tools should be determined carefully, and with respect to any AUP ( Acceptable Use Policy ) However, in a non-switched environment it can enable you to see other people's traffic, and even in a switched environment you will be able to see other people's traffic if they are logged into the same machine. Packet sniffers such as wireshark and tcpdump are valuable tools to understand exactly what traffic is flowing on a link, and to debug network applications. When you use a shared medium (such as a wireless network or a hub instead of a switch) you'll also be able to see packets belonging to other computers. ![]() Under normal circumstances, your adapter sees only the traffic that is sent to or from your computer. Wireshark (formerly known as Ethereal) is a popular cross-platform packet sniffer - it can record the packets that your network adapter sees on the network. ![]()
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