http://www.nongnu.org/lwip/2_0_x/upgrading.html
(2.0.0)
++ Application changes:
* Changed netif "up" flag handling to be an administrative flag (as
opposed to the previous meaning of
"ip4-address-valid", a netif will now not be used for transmission
if not up) -> even a DHCP netif
has to be set "up" before starting the DHCP client
This information could have also be obtained by simply stepping through
your udp_sendto() until you reach the bottom of ip4_route() in a debugger.
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