Re: [lwip-users] LwIP virtual netif

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Marcelo Mollo wrote:
> I’m using LwIP v2.0.0 (together wih freeRTOS v9.0) in a system with a 
> single ethernet controller (STM32F779NI). The application must work 
> with two different subnetworks (let’s say 192.168.1.0 and 10.0.0.0). 
> The virtual interface belongs to the second subnetwork.
>
> Searching in internet I  found these old threads that just talk about 
> what I need:
>
> /1)//[lwip-users] multiple IP addresses on network interface/
>
> //
>
> /2)//[lwip-users] LWIP and second IP feasible?/
>
> As you suggested , I tried with the macros LWIP_ARP_FILTER_NETIF and 
> LWIP_ARP_FILTER_NETIF_FN() but I’m having problems to get it working.
>
> The behavior of the virtual netif is quite irregular (I pinged both 
> IPs continously and after a while, the virtual interface stops sending 
> ping replies).

That's strange. Unless you have done something strange in that hook 
function, I expect this is just some lwIP porting error. Are you 
absolutely sure your system runs stable without that virtual netif?

> Could you please tell me how the filter must be properly implemented? 
> I used the technique to change the netif returned by 
> LWIP_ARP_FILTER_NETIF_FN() based on the destination IP address.

I did exactly that. However, I haven't been using 2 subnets but just the 
same subnet.

> [..]
>
> I did not find any reference to the multiple addresses per netif 
> implemented in IPv6. Could you please tell me where it is?
struct netif has an array of ip6_addr_t. Not that hard to miss :-)

Simon