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.
Muscle pain - Leg pain that involves muscle cramps may be due to dehydration or low levels of potassium, sodium, calcium, or magnesium in your blood. Certain medications, such as diuretics and statins, can affect the muscles and cause pain. Also, muscles may become strained or fatigued because of excessive activity.