RBridge is a secure remote Ethernet bridge solution for Linux. It connects two trusted Ethernet segments remotely over UDP using either IPv4 or IPv6 transport. RBridge uses SHA-2 (precisely SHA-256) for authentication, AES for encryption and timestamps for protection against replay attacks. Using a registry mechanism and UDP protocol, RBridge is able to connect directly to the peer from within NAT or firewall protected areas by using a special hole punching technique (thus requiring no configuration at the connecting routers). For this functionality, RBridge itself is able to act as a registry service for any associated pair of RBridges.
BarricadeMX provides very accurate, high performance spam and virus protection for Enterprise and ISP sites. Features include simple installation and administration, little if any end user interaction required, no quarrantine required, and an optional custom non-delivery receipt for all rejected messages. It uses a custom version of SpamAssassin along with many proprietary anti-spam techniques to achieve a guaranteed level of over 99% accurate spam detection with fewer than 0.1% false positives.