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.
Cramps. A principle cause of leg pain is a cramp or muscle spasm, often known as a charley horse. Muscle fatigue, dehydration, and some medicationsâsuch as diuretics and statinsâcan all lead to leg cramps.eg pain refers to pain or discomfort anywhere in the leg. It can range from a dull ache to an intense stabbing sensation. There are many causes of leg pain. However, only some of these are medically serious.