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

[Tom Evans]

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?

Thanks,

==
Tom Evans

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