ICMPTX (IP-over-ICMP) HOWTO See the current ICMPTX project home page. Problem You're sitting in an airport or in a cafe, and people want your money for Internet access. They do allow ICMP traffic, though (i.e., you can ping machines on the Internet). Enters ICMPTX. (If you can't use ping, but you can issue name queries, use NSTX: IP-over-DNS.) There are several resources online to point you in the