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.
Lower leg pain: Bones, joints and muscles. Muscle cramps . This sudden, tight, intense lower leg pain is often caused by muscle fatigue, heat or dehydration. Muscle cramps are more common among older people, endurance athletes or athletes who are not well conditioned. In most cases, you can ease muscle cramps by stopping whatever triggered them.