In Linux, the /proc filesystem is a virtual filesystem that provides access to kernel data structures. The file /proc/sys/net/ipv6/conf/$IF/disable_ipv6 is a control file that allows you to enable or disable IPv6 support for a particular network interface.

To write to this file, you need the CAP_NET_ADMIN capability. This capability allows a process to perform various network-related operations, such as modifying network interfaces and routing tables.

You can check if a process has the CAP_NET_ADMIN capability by using the getcap command. For example:

Copy code$ getcap path/to/executable

This will display a list of capabilities that are enabled for the executable specified by path/to/executable.

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