The new Cisco IOS Firewall for Internet Protocol version 6 (IPv6) provides stateful inspection to both existing IPv4 and IPv6 traffic on a single interface for enhanced performance, along with better management of the IPv6 migration process.
Causes of Muscle contractions that are rare. The offical US government definition of a rare disease is one that affects 200,000 people or less. The following causes of Muscle contractions appear in the population at a rate of less than 200,000 people per year in the USA: 1  Alpers Syndrome-involuntary muscle contraction. 2  Fahr's Syndrome-athetosis. 3  Ramsay Hunt syndrome Type II-involuntary muscle contraction.
What Causes Leg Cramps? Leg cramps at night are called recumbency cramps, and are caused by spasmlike muscle contractions. You might also experience leg cramps after exercising if you are dehydrated. In both cases leg cramps can be caused by electrolyte or mineral imbalance in the body. If your leg cramps are brought on by exercise, you may be dehydrated.