[lwip-devel] [bug #33128] Socket send() and sendto() do not use bound interface.

[Simon Goldschmidt]

Follow-up Comment #4, bug #33128 (project lwip):

> The reason is that there is a check to see if the packet's 
> source address is equal to the netif's address (around line 560 in udp.c

Now that's what I call a bug: the code selects an interface to send to and
some lines below rejects its own choice :-) We should fix that...

> This would be bad because the 10.0.0.254 gateway is not 
> connected to the internet

This is a common routing problem: you just have the default-netif wrong. If
you have 2 netifs where one should be used for unknown (internet-) traffic,
than that should be the default netif, not the other one. You get that problem
under windows or linux, too. On windows, for example, you have to adjust the
interface metric to adjust the routing table. And yes, you do get these
strange wireshark logs where you see the source address of interface A while
logging interface B.

To me that's not an lwIP problem but simply a routing issue. However, due to
lwIP's limited routing "table", routing is more limited than on other stacks.

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