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SubjectRe: inconsistency between SIOCGIFCONF and SIOCGIFNAME
On Mon, 28 Jun 2004 21:06:25 -0700
Ulrich Drepper <> wrote:

> POSIX does not specify the if_indextoname and if_nameindex functions,
> they are only vaguely specified in an RFC. So there is some room for
> interpretation but still I think it is an issue.
> If SIOCGIFCONF to query the system's interfaces only active interfaces
> are returned. But SIOCGIFNAME (and SIOCGIFINDEX) allow querying
> interfaces which are down and not fully initialized.
> RFC 3493 says if_nameindex should return *all* interfaces. This means
> that neither if_indextoname or if_nametoindex (defined in the same rfc)
> should define more interfaces.

The bridge utilities depends on being able to do if_indextoname and
if_nametoindex for interfaces that aren't active to IP. Other non-IP
usage probably does as well.

Stephen Hemminger
Open Source Development Lab
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