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April 08 2010

finkregh

pwnat - NAT to NAT client-server communication

pwnat, pronounced "poe-nat", is a tool that allows any number of clients behind NATs to communicate with a server behind a separate NAT with *no* port forwarding and *no* DMZ setup on any routers in order to directly communicate with each other. The server does not need to know anything about the clients trying to connect. Simply put, this is a proxy server that works behind a NAT, even when the client is behind a NAT, without any 3rd party.
Tags: nat networking security tunneling udp

August 22 2009

finkregh

ICMPTX (IP-over-ICMP) HOWTO

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 right direction, most notably Case of a wireless hack by Siim Põder. There is a similar, thoroughly undocument program called itun, a simple icmp tunnel that claims to do the same thing. Also, check out PingTunnel which is not IP-over-ICMP, but rather TCP-over-ICMP and, therefore, less useful. Once you've followed these instructions, you basically have a remote proxy, providing you with access to the Internet. Communication between you and the remote proxy is over ICMP. Note that these instructions play nicely with NSTX. You can run both on one proxy.
Tags: linux security howto hacking internet tunnel wireless proxy ip dns ip-over-icmp tunneling icmp icmptx
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