IO::Interface and Net::Interface both use getifaddrs, but it isn't part of the POSIX spec. From the linux manpage:
This function first appeared in BSDi and is present on the BSD systems, but with slightly different semantics documented— returning one entry per interface, not per address. This means ifa_addr and other fields can actually be NULL if the interface has no address, and no link-level address is returned if the interface has an IP address assigned. Also, the way of choosing either ifa_broadaddr or ifa_dstaddr differs on various systems.

getifaddrs() first appeared in glibc 2.3, but before glibc 2.3.3, the implementation supported only IPv4 addresses; IPv6 support was added in glibc 2.3.3. Support of address families other than IPv4 is available only on kernels that support netlink.

In reply to Re^2: Getting list of network interfaces by Anonymous Monk
in thread Getting list of network interfaces by Anonymous Monk

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