Hi all, We are trying to get a port-knocking extension into the Linux kernel, which would be useful to obscure TCP services -- such as GNUnet or Tor Bridges, and could use your help to collect data to help convince the Linux people to adopt the latest patch.
As Knock uses two fields in the TCP header in order to hide information and we explicitly want to be compatible with machines sitting in typical home networks, we need to make sure that this information doesn't get corrupted by the majority of NAT boxes out there. We thus created a program which tests if Knock would work in your environment. It would be great if some of you were able to execute the program on your machines in order to help us to get an estimation of if Knock one day could be used in a large scale. You can find sources, binaries and a more elaborate description here: https://gnunet.org/knock_nat_tester Technical details about Knock and a (somewhat outdated) research paper as well as kernel patches are provided here: https://gnunet.org/knock Please help, it should only take a minute to download & run the code. Thanks! Julian & Christian
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