[lwip-users] No ARP reply by using two NICs

[Stefan Lankes]

Hi LwIP users,

I have an ARP problem and I am not sure, if this a problem of LwIP.

In our academic operating system, we use LwIP 1.4.0 as TCP/IP stack. My test 
system posses two network devices and  each device belongs to its own subnet. I 
enabled IP forwarding to transfer IP packets between the subnets and it seems 
to work.
 
However, if a member of subnet A broadcasts an ARP request to determine the 
physical address of a member of subnet B, our system does not forward these 
broadcasts to subnet B. LwIP drops the requests with the message “ARP request 
was not for us.”
 
Is this behavior correct?

Cheers,

Stefan