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Så det du sier er at om jeg legger inn Linux på en bærbar og kjører wireshark på vanlig måte så får jeg også opp all trafikk fra andre maskiner enn min ?

Beklager at dere må mate meg med teskje ... men er man en gang helt ny på noe så ...
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Ja.
Det er noen få nettverkskort som ikke kan dette på Linux heller, Google "<nettverkskort> promiscuous mode wireshark"

Promiscuous mode
In promiscuous mode the MAC address filter mentioned above is disabled and all packets of the currently joined 802.11 network (with a specific SSID and channel) are captured, just as in traditional Ethernet. However, on a "protected" network, packets from or to other hosts will not be able to be decrypted by the adapter, and will not be captured, so that promiscuous mode works the same as non-promiscuous mode.

This seems to work on Linux and various BSDs, including Mac OS X. On Windows, putting 802.11 adapters into promiscuous mode is usually crippled, see the Windows section below.

Promiscuous mode can be enabled in the Wireshark Capture Options.
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https://wiki.wireshark.org/CaptureSetup/WLAN