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.
The exact cause of a leg cramp is not well understood, but there are some risk factors that are thought to contribute to this condition: 1  Muscle fatigue. 2  Heavy exercising. 3  Dehydration. High weight (not necessarily obesity)  Electrolyte 1  imbalances. Medications (statins, prednisone, others...)