IPv6
   IPv6, which is supported in  some of the latest OSes and network devices, is all about end-to-end, or  peer-to-peer communications. Aside from offering more address space  than its IPv4 predecessor -- which has made it immediately popular in  some parts of the world -- it offers a redesigned IP packet format that  simplifies route processing, making it ideal for applications such as  voice over IP or instant messaging.  But IPv6 presents a whole  range of new security problems, experts say. French researchers recently  found problems in the IPv6 protocol specification itself, namely in the  routing header. Bottom line: The specification lets the sender add an  arbitrary number of extra headers on IPv6 packets, and the IPv6-based  routers or hosts must process these headers. It's a denial-of-service  attacker's dream come true.  Speaking at last month's CanSecWest  conference, researchers Philippe Biondi and Arnaud Ebalard disclosed  details of problems they found in IPv6...