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Distros disable it by default but it gets silently enabled when you install things like docker (and maybe livbirt) and so on. At least Docker (as it was pointe

by yrro 7y ago

Distros disable it by default but it gets silently enabled when you install things like docker (and maybe livbirt) and so on. At least Docker (as it was pointed out by a sibling reply to my comment) also sets the FORWARD chain policy to DROP.