OpenSSH Heartbeat/Watchdog Patch adds a heartbeat (keepalive) function to ssh(1). If the output channel has been silent for more than a specified time, a null message (SSH_MSG_IGNORE) is sent to the server as a heartbeat. The heartbeat is useful for keeping connections over IP masquerade/NAT boxes, firewalls, etc. This patch also adds a watchdog timeout function to sshd(8). The combination of the heartbeat and the watchdog timeout is very useful for detecting a link which is down over unreliable connections such as a wireless network.
trackpeer is an agent that helps network and server administrators with tracking their users' computers. It makes it possible to determine the MAC addresses of computers over a network, even when the computers are behind NATed gateways. This agent is intended to be used by the administrators who need to identify and locate malicious computers and virus-infected computers in a network such as a middle-sized wireless LAN, public Ethernet jack system, campus, or corporate network.
WeOCR is a platform for Web-enabled OCR (Optical Character Reader/Recognition) systems. It enables people to use character recognition over networks. A WeOCR server receives document images from users, recognizes text in the images, and returns recognition results to the users. WeOCR does not have its own character recognition engine. Instead, it is intended to accommodate various existing character recognition engines.
Re: usefulness ?
This patch might be useless if you are lucky enough to have no SSH1 server around you. More importantly, this patch (especially the latter half part) was originally developed to be used with the