Back in the day when every hotel that was charging for WiFi was stupidly leaving port 53 wide open, I wrote an IP over DNS tunnel to get free WiFi. Worked grea

Back in the day when every hotel that was charging for WiFi was stupidly leaving port 53 wide open, I wrote an IP over DNS tunnel to get free WiFi. Worked great until I went to a hotel in Tokyo and turned it on. Suddenly my network connection was completely dead. They were clearly watching for shenanigans. Took me a few minutes to figure out they had redirected my MAC address to the bit bucket. I spoofed my MAC to a different one, and then behaved, as well as admired those IT guys.