Путеводитель по Руководству Linux

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   netdevice    ( 7 )

низкоуровневый доступ к сетевым устройствам Linux (low-level access to Linux network devices)

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Примечание (Note)

SIOCGIFCONF and the other ioctls that accept or return only
       AF_INET socket addresses are IP-specific and perhaps should
       rather be documented in ip(7).

The names of interfaces with no addresses or that don't have the IFF_RUNNING flag set can be found via /proc/net/dev.

AF_INET6 IPv6 addresses can be read from /proc/net/if_inet6 or via rtnetlink(7). Adding a new IPv6 address and deleting an existing IPv6 address can be done via SIOCSIFADDR and SIOCDIFADDR or via rtnetlink(7). Retrieving or changing destination IPv6 addresses of a point-to-point interface is possible only via rtnetlink(7).