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.
There are many possible causes of leg twitching. They may caused by simple fatigue of the muscle, stress, anxiety and even caffeine. Prolonged twitching may be caused by more serious medical conditions such as injury, nervous system disorders, certain medications, or excesses of heavy toxins.eg Twitching is often diagnosed as Restless Leg syndrome (RLS). Uncomfortable sensations in the legs, especially during rest cause the patient to voluntarily move their legs to remove the sensations. Involuntary movements of the legs during rest may be a sign of Periodic Limb Movement Disorder (PLMD).