On Wed, 10 Aug 2011 09:54:58 +0200
"Weirich, Bernhard" <Bernhard.Weirich@ried...> wrote:

> Hello,
>
> I had trouble with the new detection code for interface ports.
> In turned out that the carrier was down, but IFF_RUNNING was set.
> I changed the code to check for IFF_UP & IFF_LOWER_UP for interface ports and now it works the way it should.
> Would it be better to check IFF_LOWER_UP or is my interface device driver incorrect?
>
> Best regards,
> Bernhard

The standard for carrier up is IFF_RUNNING. IFF_LOWER_UP is meant for
use by modems and other special devies.
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