[lwip-users] ARP requests crashing stack

[David Shmelzer]

I'm having an issue where the lwIP stack stops responding completely after an 
IPscan on the subnet is performed. This spews out a rapid series of ARP 
requests which, I assume, is flooding the stack's ARP handler. It could be 
something else causing, but I don't know what yet.

The stack stops responding because the Ethernet MAC stops generating interrupts.
lwIPstats() reports an ETHARP drop and lenerr which makes me think the MAC is 
is not being serviced fast enough.
I'm using a modified STR9 demo from FreeRTOS with lwip 1.4.0.
My lwipopts.h settings are using the defaults for the most part.

Has anyone else ever had this issue?
Does it have to do with MAC interrupt servicing or the stack?

-Dave