The Lion worm works much like the Ramen Worm, exploiting the well known BIND vulnerabilities reported back in January of this year. Lion Worm - Lion is a new worm, that is very similar to the Ramen worm. However, this worm is much more dangerous and should be taken seriously. It infects Linux machines with the BIND DNS server running. The bind vulnerability is the TSIG vulnerability that was reported back on January 29, 2001.
White papers are probably the most formal method, and they have the advantage of wide dissemination.
These documents usually speak to a specific issue in depth. The range varies though with respect to the quality of coverage. In a bridge, all packets received by one interface are passed to the other, without regard to source or destination IP address, by examining the Ethernet MAC destination address of the packet. AC2I, a French company, distributes a kernel patch that allows the ipchains packet filter to work on the bridged interfaces. This configuration allows you to set up a firewall system that is invisible to the Internet, yet provides a high level of protection and access control for your private network.