Dear Internet, whenever you’re setting up a high-performance TCP or specially a UDP server on Linux, don’t be stupid like me, and do remember to pay attention to connection tracking on your server. What is connection tracking? Connection tracking is normally used by Linux for certain firewall rules, like those that depend on connection state such as NEW, ESTABLISHED, RELATED, etc. Even UDP connection can have pseudo-state tracked by Linux.…

See also this post on reddit. If you want to be an alpha tester, go to: http://www.maskedhost.com/…

I’m a happy consumer of Internet services. Besides buying products from Amazon, iTunes, Google and other giants, I also subscribe to a bunch of small service providers that prove their competence and respect for consumers. It’s only fair that I give them some praise and recommend their services to whoever might find this post. rsync.net is a remote storage site that provides flexible data access like SSH, WebDAV and obviously rsync.…