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At a first glance, IPTables rules might look cryptic. In this article, I’ve given 25 practical IPTables rules that you can copy/paste and use it for your needs. These examples will act as a basic templates for you to tweak these rules to suite your specific requirement.
This article is part of the on-going Unix Sed Tips and Tricks series.
In our previous regular expression part 1 article, we reviewed basic reg-ex with practical examples. But we can do much more with the regular expressions. You can often accomplish complex tasks with a single regular expression instead of writing several lines of codes.