Hi list,

 

I have succesfully ported lwip 1.3.0 to LPC2468. Lwip is running in a
threaded environment, FreeRTOS. I have a basic example running, with a
webserver.

 

I have enabled ip reassembly, see my lwipopts.h file attached to this mail.

 

I have a webbrowser running, which is requesting a webpage from the
webserver each second, and I am pinging the system continually, through the
command

Ping <ip> -t

 

The system is running ok. But if I ping the system with a lot of data bytes,
i.e. ping <ip> -l 2048. The system crashes.

I end up in an data abort exception. The reason for this exception, is a
pointer, r, in function ip_reass() is containing an invalid address.

The line in C code is:

 

iprh = (struct ip_reass_helper*)r->payload;                            //
line number: 572 in ip_frag.c

 

What can I do, to avoid this “ping of death” ?

 

P.S.: Please be aware that I have yet to optimize the system regarding
values in lwipopts.h. But that will be a topic for another question on this
list.

 

Regards,

Martin

 

Attachment: lwipopts.h
Description: Binary data

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