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[lwip-users] ARP requests but no reply

From: Robert Schilling
Subject: [lwip-users] ARP requests but no reply
Date: Fri, 09 Apr 2010 13:48:58 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv: Gecko/20100317 Lightning/1.0b1 Thunderbird/3.0.4

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

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