The mechanism is (embarrassingly) simple: When you first connect to the paid network and attempt to browse a website, you’re redirected to a splash page for payment. Some paid Wi-Fi services implement filtering by MAC address. Theoretically, this would be simple on certain types of paid services. Naturally, as a student with an interest in wireless networking, I started to wonder if there was a way to bypass the payment option get some free access.
I was flying back to New York recently, and my flight (like most) had a paid Wi-Fi access option. This is merely an academic exercise performed in a lab setting. I do not condone or suggest that you attempt to bypass filtering mechanisms for paid Wi-Fi access. "802.11 beacons, and packets belonging to a certain wireless MAC address, should be the only packets", replace and with or.įor a display filter, replace wlan host 00:11:22:33:44:55 with wlan.addr = 11:22:33:44:55:66, replace wlan dst host 00:11:22:33:44:55 with wlan.da = 11:22:33:44:55:66, replace wlan src host 00:11:22:33:44:55 with wlan.sa = 11:22:33:44:55:66, and replace subtype beacon with wlan.fc.type_subtype = "Beacon frame".Note: The following article is theoretical and based on lab testing.
If you just want "sent to" or "sent from", use wlan dst host or wlan src host, respectively, rather than wlan host. "802.11 beacons belonging to a certain wireless MAC address should be the only packets", then, if you want packets sent to or from the MAC address, the other answer's filter is the correct capture filter. "both a & b are satisfied" could mean either "I want packets for which both a & b are true" or "I want packets for which a is true and packets for which b is true". I would like to apply filter on a wireless sniffer capture such that (both a & b are satisfied) a) 802.11 beacons are present b) Packets belonging to a certain wireless MAC address are listed.
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