You are referring to DNS tunneling, which is different. With OzymanDNS your laptop can tunnel out to the net in spite of your hotel's crappy gateway. With DNS

You are referring to DNS tunneling, which is different. With OzymanDNS your laptop can tunnel out to the net in spite of your hotel's crappy gateway. With DNS source routing anyone on the Net can tunnel onto your laptop in spite of it having no way to receive inbound IP traffic.