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Apache IPv4 deny directive blocks IPv6 addresses

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http://serverfault.com – Edit I have thought that excessive number of "deny" lines are confusing apache into blocking unlisted IPv4 addresses. But comment of @Ladadadada made me pinpoint the exact issue. You can read my old question below. The problem is, the following line: deny from 42.1.0.0/19 blocks the IPv6 addresses 2a01:4f8:120:8201::2 2a01:1e8:e100:ce::2 How is this possible? I have a really long list of blocked IP addresses, activated by an Include directive inside the Directory block. This file only contains IPv4 addresses, but my server is also blocking a limited number of IPv6 addresses. It's no (HowTos)