From owner-freebsd-net  Tue May 22 11:12:28 2001
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Date: Tue, 22 May 2001 14:12:18 -0400 (EDT)
From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
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To: =?iso-8859-1?q?vishwanath=20pargaonkar?= <vishubp@yahoo.com>
Cc: freebsd-net@FreeBSD.ORG
Subject: interface flags
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<<On Tue, 22 May 2001 07:52:44 +0100 (BST), =?iso-8859-1?q?vishwanath=20pargaonkar?= <vishubp@yahoo.com> said:

> i have freebsd 4.2 stable.
> what is difference between interface flags IFF_UP and
> IFF_RUNNING? 

IFF_UP indicates that the interface is administratively configured up.
IFF_RUNNING indicates that the hardware has been set to an operational
state.  For Ethernet-like interfaces, which often do not provide a
direct link-ready indication to software, IFF_RUNNING is usually not
meaningful.  (In true historic Ethernets, there was no way for even
the hardware to know whether its transceiver was connected to a
network or not.)

-GAWollman


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