Hi All ..
Currently I am working on the LWIP stack, which we have ported on to the
STR912 processor.
Actually I am facing a strange problem of reassembling process of Fragmented
ICMP packet.
My observation was the ping utility is failing at higher packet size (more
than 1472 ) say1500.
But the same works if we send the ping command less than 1472.
So I understand that when ever we send the ping command with more than 1472
bytes, it basically splits the packet into and the same
Is reassembled on the LWIP stack. I saw the sender sends the ping command
with fragmented messages.
These fragmented messages are received on the STR912 that is our target
where the LWIP stack will be running.
So the LWIP while in the process of reassembling it is going to some Assert
statement. Actually it is going to some assert statement in pbuf_header()
function in the pbuf.c file and the code is
if (header_size_increment < 0){
increment_magnitude = -header_size_increment;
/* Check that we aren't going to move off the end of the pbuf */
LWIP_ERROR("increment_magnitude <= p->len", (increment_magnitude <=
p->len), return 1;);
}
I have seen one of the mail asking the same question for the solution in
2006. So could u please suggest me whether the issue of reassembling process
and the fragmentation is fixed or not. Currently I am using the 1.0.3
version. Does the LWIP stack is tested with the Ping utility with more than
10000 bytes ?
Thanks
With Regards
Arun Honnappa
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