Toothache is merely a symptom of being sick. It can cause sore throat, swelling of the gums, neck glands and muscle pains. There is a dull or sharp pain on the head or jaw bones. Toothache cause by abscess formation can spread to oral parts of the mouth. Ulcers can break open and release more bacteria.
iptables is a user-space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores. but since iptables is more like a service rather than an essential binary, the preferred location remains. . The term iptables is also commonly used to inclusively refer to the kernel-level components.
Using IPtables to Stop SSH Brute Force Attacks. I like to think of this approach similar to flow rates with pipes. Bigger pipes allow more water to flow. Smaller pipes can handle less water. To block a SSH brute force attack, we just need to slow down the flow of requests. We can do this by rate-limiting requests to SSH with iptables. Essentially, we create a smaller pipe for new SSH sessions. This slows brute force attacks to a point where they become ineffective.