[lwip-users] LwIP virtual netif

[Marcelo Mollo]

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 https://lists.gnu.org/archive/html/lwip-users/2012-12/msg00031.html

 

2)      [lwip-users] LWIP and second IP feasible? http://lists.nongnu.org/archive/html/lwip-users/2011-03/msg00056.html

 

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).

Could anyone 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.

 

Just another question. In the second thread there is a mention to multiple netifs implemented in IPv6 that can be taken as a hint. I did not find any reference to the multiple addresses per netif implemented in IPv6. Could anyone please tell me where I can find it?

 

Thandk you in advance.

 

Marcelo