[lwip-users] ARP requests but no reply

[Robert Schilling]

Hi guys,

I'm trying to port port lwIP to a ARM Cortex M3 NXP LPC1768.
I'm using following Example: 
http://www.coocox.com/EXAMPLE/NXP_LPC1766_ARMCC.htm

If I want to ping the device, ARP requests of the host computer are 
coming in, but the device doesn't reply them.

I could isolate the problem to the function update_arp_entry() where the 
reply should be started.
There is a loop, where the queued packets should be sent: while 
(arp_table[i].q != NULL).

In my case arp_table[0] gets initialized but arp_table[0].q is always NULL.
For this reason I don't get an ARP reply.

Can anyone help me for my problem?
Thanks in advance!

Best regards from Austria
Robert