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Create a special shortcut using Wireshark's command-line arguments to start capturing packets without delay. The number of the network interface needs to be known beforehand, based on the order Wireshark displays the interfaces.

Create a copy of Wireshark’s shortcut, right-click it, go into its Properties window and change the command line arguments. Add -i # -k to the end of the shortcut, replacing # with the number of the interface to use. The -i option specifies the interface to use, while the -k option tells Wireshark to start capturing immediately.