Do we still need IFF_DOWN?

[masayuki2009]

I noticed that IFF_DOWN is used both in nuttx and in apps to control network interface.
In my understanding, IFF_UP is enough and IFF_DOWN is rather redundant.

So my question is that do we still need IFF_DOWN?

[xiaoxiang781216]

Same question for me, should we remove one? or change the code from:

#define IFF_DOWN           (1 << 0) /* Interface is down */
#define IFF_UP             (1 << 1) /* Interface is up */

to:

#define IFF_DOWN           (0 << 1) /* Interface is down */
#define IFF_UP             (1 << 1) /* Interface is up */

[masayuki2009]

Same question for me, should we remove one? or change the code from:

#define IFF_DOWN           (1 << 0) /* Interface is down */
#define IFF_UP             (1 << 1) /* Interface is up */

to:

#define IFF_DOWN           (0 << 1) /* Interface is down */
#define IFF_UP             (1 << 1) /* Interface is up */

@xiaoxiang781216

I think that the above change does not work.
So I think we should replace all IFF_DOWN related code both in nuttx and in apps with IFF_UP.