RE: [lwip-users] Examples don't set the Loopback Interface to "up", so Loopback won't work.

[Goldschmidt Simon]

> I don't have a "real interface" on my lwIP port, so I'm 
> trying to bounce packets off an echo server on the Loopback port.
> 
> The code is failing in ip_input() on the test for:
> 
>     /* interface is up and configured? */
>     if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr))))
> 
> As far as I can tell, nothing in the code and nothing in any 
> of the supplied contrib/ports/* (including the ones that 
> create a Loopback
> Interface) ever call netif_set_up() on it.
> 
> Am I missing something, or did the "(netif_is_up(netif))" 
> check get added to ip_input() after the last update of the 
> example ports, and nobody has tested them recently?

No, you're not missing anything. At least not for the msvc6 port...
I've never tested a loopback connection with that port though,
only on my embedded target, and I set it up there.

I'll change that.

Simon