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The same sort of thing can happen when capturing over a remote connection, e.g., SSH or RDP.ħ.9.3. IP Name Resolution (Network Layer) You might run into the observer effect if the extra traffic from Wireshark’s DNS queries and responses affects the problem you’re trying to troubleshoot or any subsequent analysis. As a result, each time you or someone else opens a particular capture file it may look slightly different due to changing environments.ĭNS may add additional packets to your capture file. The resolved names might not be available if you open the capture file later or on a different machine. Wireshark obtains name resolution information from a variety of sources, including DNS servers, the capture file itself (e.g., for a pcapng file), and the hosts files on your system and in your profile directory. The name is also not found in Wireshark’s configuration files. Unknown by the name servers asked, or the servers are just not available and

Of course, individually assigning IP addresses to devices may solve the problem, but where large number of devices are present on a network, it becomes impractical to establish and maintain such a scheme. The MAC address being unique, at least within a sub-network, serves as a unique identification token. Also, it would be difficult to unambiguously and individually identify each device. by a DHCP server, a nightmare, because there would be no way to make sure a device will not get more then the predetermined number of IP addresses allowed to each device. However, it can make centrally assigning IP addresses, e.g. Obviously, these networking interfaces did not carry MAC addresses or any other form of a unique, physical identity. Such systems existed in the past, such as networks based on linking devices through their UART (e.g. The Data Link layer can be made to ignore any MAC filtering, leaving this functionality to the Network layer, to filter out according to its own IP address. Your question is a very legitimate one! The truth is that theoretically an IP only system can be created and function well without the need for MAC addressing system.