R: [lwip-devel] two netif on the same HW - DHCP and fixed iptoghether

[Ceresoli Luca]

Alain M. wrote:
> What I am not sure is how to get the MASK correct with 
> AUTOIP, any ideas?

AUTOIP sets the following (see autoip_bind() in autoip.c):
IP      169.254.x.y  (where 1<=x<=254)
NETMASK 255.255.0.0
GW      0.0.0.0

This is what the RFC specifies. 169.254.0.0/16 is reserved for this use.
Since there is no GW, to access a lwIP node with an AUTOIP address you must be 
in the same network.
There are resolution protocols in the Zeroconf family, but they are not 
implemented in lwIP.

Luca