Re: [lwip-users] SYN/ACK issue in TCP client/server implementation under eCos with LwIP-TCP/IP stack on ARM Evaluator 7T board

[Ashish Anand]

I guess these are the mDNS packets, which we should ignore actually.. I
wasn't able to turn off my mDNS service on the Linux box so this persists.

>From the code that I pasted.... it does not respond to ICMP pings either...
from day 1.

Has anyone actually tried eCos with the LwIP stack with the ARM processor? I
think this problem that I'm facing is limited to ARM since many people have
successfully developed webserver implementations on other boards.

Anyway, can someone suggest what to change in my code so that Pings may be
replied to?




Kieran Mansley wrote:
> 
> On Mon, 2007-03-05 at 01:54 -0800, Ashish Anand wrote:
>> Why would I be able to PING the board? I have not implemented any ICMP
>> code
>> in my program (I'm assuming that I must write some code to make the board
>> ack ICMP packets). So, as of now, no, I can't PING my board, and all this
>> while I wasn't expecting to be able to either :-)
>> 
>> Correct me if I'm wrong!
> 
> lwIP includes ICMP code.
> 
>> Secondly, here's some good looking debug stuff:
> 
> [snip]
> 
>> ip_input: iphdr->dest 0x401a8c0 netif->ip_addr 0x401a8c0 (0x1a8c0,
>> 0x1a8c0,
>> 0x4)
>> ip_input: iphdr->dest 0x401a8c0 netif->ip_addr 0x100007f (0xc0, 0x7f,
>> 0x401a800)
>> ip_input: packet not for us.
>> ip_forward: not bouncing packets back on incoming interface.
> 
> This is the interesting bit.  The lwIP receive code gets two packets:
> the first it matches and passes through, the second it says is not for
> us due to the IP address in the packet being different to the
> interface's address.  The first packet getting through suggests that
> something is right however.  I'd look into what happens to this first
> packet and check out if it is the one you're interesting in (the reply
> to the SYN) or if that one is the one that gets dropped.
> 
> Kieran
> 
> 
> 
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