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First try SIOCGLIFFLAGS with an IPv4 socket, then again with an IPv6 socket if that fails. Use that same socket for the other ioctl queries. Avoid adding an IPv6 alias address that is the same as an IPv6 primary address. This is the same as an existing check in the IPv4 case. Fix a loop exit boundary condition check.
libdnet ------- libdnet provides a simplified, portable interface to several low-level networking routines, including network address manipulation, kernel arp(4) cache and route(4) table lookup and manipulation, network firewalling, network interface lookup and manipulation, IP tunnelling, and raw IP packet and Ethernet frame transmission. WWW: http://libdnet.sourceforge.net/ $Id: README 578 2005-02-14 21:00:17Z dugsong $