[lwip-users] multiple IP addresses on network interface

[Artem Pisarenko]

This topic was discussed earlier on mailing list 
(http://lists.nongnu.org/archive/html/lwip-users/2011-03/msg00024.html) 
and there are people interested in this feature.

I'm aware of solution to use multiple netifs on single driver. Simon 
said that he did it successfully but I faced with a lot of problems 
trying to implement it in my driver because of ethernetif_input() 
ambiguity. Simple solutions such as accepting packet on any one assigned 
netif or accepting packet on all assigned netifs aren't suitable. Driver 
has to be very smart and analyze packet with code taken from lwip core 
to determine which assigned netif it should be sent to.

I even tried following solution: driver detects eth type of incoming 
packet, if it's ARP then accept packet on all assigned netifs, otherwise 
accept it on first assigned netif (based on fragment of ip_input() which 
walks the list of all configured netifs trying to find matching netif). 
But this doesn't work as expected. ip_input() finds correct netif but 
ignores it in further processing. And, for example, if packet is icmp 
ping request then answer is being sent to gateway of source netif 
instead of right one.

Could you provide with fast workaround at this moment ?
Any help appreciated.

--
Regards,
Artem