[lwip-devel] [bug #21643] udp_send/raw_send don't fail if netif is down

[Jonathan Larmour]

Follow-up Comment #12, bug #21643 (project lwip):

> We should check that ARP doesn't respond on ARP requests to its
> own address until the netif is up, but my guess is this is
> already implemented.

It seems it is not implemented.

For DHCP, other stacks have the concept of being half-up. Usually the
interface is in fact marked up at this point, but a user should not be using
it yet as its state is indeterminate. Of course the routing table would
prevent any normal packets using it.

So I wonder if the real problem (and fix) is in ip_route().

At the same time, if such a fix prevents DHCP, maybe DHCP should be allowed a
way to send with a particular netif. Even now, I don't think DHCP could work
reliably in lwIP if you have more than one netif, so identifying the netif to
use seems wise.



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