Re: [lwip-devel] Support for multihoming

[Simon Goldschmidt]

"Marcus Bäckman" <address@hidden> wrote:
> Does lwip support multihoming, in the context that multiple IP addresses
> are
> binded to the same interface?
> 
> If no, how would you estimate the amount of changes needed to archieve
> this
> support?
> Any general ideas how to implement this?

lwIP does not really support this, but my workaround is to create 2 netifs that 
have different address but use the same hardware interface for sending. The 
only problem is that you need to determine the input netif based on the 
packet's destination IP address. For this purpose, I added 
LWIP_ARP_FILTER_NETIF some months ago, which can call a user-specified function 
to exchange the input netif at ethernet input levelbefore passing packets up 
the stack. For me this worked quite well to have 2 IP addresses at the same 
time (e.g. to continue using an old address while changing to a new address).

Simon
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