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The reason for this is because all IPv4 addresses are also IPv6 addresses. A small range of IPv6 addresses was set aside to be used for one-to-one mapping of IPv4 addresses. For example, the IPv4 address 192.0.2.128 is accessible via the IPv6 address ::ffff:192.0.2.128. This was done so that any applications which support IPv6 only, could still listen on ...


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By default if you dont specify address to Apache Listen parameter, it handles ipv6 address using IPv4-mapped IPv6 addresses. You can take a look in Apache ipv6 The output of netstat doesn't mean Apache is not listening on IPv4 address. It's a IPv4-mapped IPv6 address.


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When you execute netstat -tulpn it clearly shows Not all processes could be identified, non-owned process info will not be shown,you would have to be root to see it all.


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from wikipedia On Linux, netstat (part of "net-tools") is deprecated, ss (part of iproute2) should be used instead. The net-tools package has not seen a Linux release in more than a decade. That's a long time to go without an update for a program suite designed to manage and monitor an ever-evolving kernel's communications interfaces - especially when ...



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